HIROKI MIYAOKA

Last Updated :2026/05/15

Affiliations, Positions
Natural Science Center for Basic Research and Development, Professor
Web Site
http://hydrogen.hiroshima-u.ac.jp/
E-mail
miyaokahiroshima-u.ac.jp
Other Contact Details
1-3-1 Kagamiyama, Higashi-Hiroshima, Japan
TEL : (+81)82-424-4604 FAX : (+81)
Self-introduction
Research on "sustainable material conversion" such as hydrogen production, hydrogen storage, nitride synthesis (ammonia) based on utilization of light elements such as Lithium (Li) and Sodium (Na) are carried out. In addition, analysis techniques for the above active materials are studied.

Basic Information

Major Professional Backgrounds

  • 2009/03/01, 2011/03/31, Hiroshima University, Institute for Advanced Materials Research, Assistant Professor (Special Appointment)
  • 2011/04/01, 2016/03/31, Hiroshima University, The Institute for Sustainable Sciences and Development, Lecturer (Special Appointment)
  • 2007/04/01, 2009/02, Hiroshima University, Institute for Advanced Materials Research, Research Fellow of the Japan Society for the Promotion of Science
  • 2016/04/01, 2017/03/31, Hiroshima University, Institute for Advanced Materials Research, Associate Professor
  • 2022/07/26, 2025/03/31, Hiroshima University, Professor (Special Recognition)

Academic Degrees

  • Doctor of Philosophy, Hiroshima University
  • Master of Science, Hiroshima University

Educational Activity

  • [Master's Program] Graduate School of Innovation and Practice for Smart Society
  • [Master's Program] Graduate School of Advanced Science and Engineering : Division of Advanced Science and Engineering : Mechanical Engineering Program
  • [Master's Program] Graduate School of Advanced Science and Engineering : Division of Advanced Science and Engineering : Transdisciplinary Science and Engineering Program
  • [Doctoral Program] Graduate School of Innovation and Practice for Smart Society
  • [Doctoral Program] Graduate School of Advanced Science and Engineering : Division of Advanced Science and Engineering : Mechanical Engineering Program
  • [Doctoral Program] Graduate School of Advanced Science and Engineering : Division of Advanced Science and Engineering : Transdisciplinary Science and Engineering Program

Research Fields

  • Engineering;Material engineering;Structural / Functional materials

Research Keywords

  • Hydrogen, Hydrogen storage, Hydrogen production, Energy conversion, Nitrides, Ammonia, Sustainable material science, Analysis technique

Affiliated Academic Societies

  • The Society of Chemical Engineers
  • The Carbon Society of Japan
  • The Japan Institute of Energy
    Related URL
  • The Japan Institute of Metals and Materials
    Related URL
  • Hydrogen Energy Systems Society of Japan
    Related URL

Educational Activity

Course in Charge

  1. 2026, Liberal Arts Education Program1, 2Term, Perspectives in Physics A
  2. 2026, Liberal Arts Education Program1, 1Term, Experimental Methods and Laboratory Work in Physics I
  3. 2026, Liberal Arts Education Program1, 2Term, Experimental Methods and Laboratory Work in Physics II
  4. 2026, Liberal Arts Education Program1, 1Term, Carbon-neutral Science and Technology
  5. 2026, Undergraduate Education, 3Term, Inorganic Chemistry I
  6. 2026, Undergraduate Education, 4Term, Inorganic Chemistry II
  7. 2026, Graduate Education (Master's Program) , 3Term, Functional Materials for Hydrogen
  8. 2026, Graduate Education (Master's Program) , 1Term, Introduction to Physics and Material Science
  9. 2026, Graduate Education (Doctoral Program) , Year, Advanced Study in Quantum Matter
  10. 2026, Graduate Education (Master's Program) , Year, Special Study of Advanced Science and Engineering Transdisciplinary Science and Engineering
  11. 2026, Graduate Education (Doctoral Program) , Year, Special Study of Advanced Science and Engineering Transdisciplinary Science and Engineering
  12. 2026, Graduate Education (Master's Program) , First Semester, Special Exercises of Advanced Science and Engineering Transdisciplinary Science and Engineering A
  13. 2026, Graduate Education (Master's Program) , Second Semester, Special Exercises of Advanced Science and Engineering Transdisciplinary Science and Engineering B
  14. 2026, Graduate Education (Master's Program) , 3Term, Transdisciplinary Science and Engineering Program Common Subjects 1 (Smart Development)
  15. 2026, Graduate Education (Master's Program) , 1Term, Sustainability Materials Science
  16. 2026, Graduate Education (Doctoral Program) , Year, Seminar on Doctoral Dissertation
  17. 2026, Graduate Education (Master's Program) , 2Term, Advanced Energy Conversion Systems

Research Activities

Academic Papers

  1. Ammonia Methanation over Ru/Al2O3-Ni/CeO2 Hybrid Catalysts, JOURNAL OF THE JAPAN PETROLEUM INSTITUTE, 68(5), 202-206, 2025
    Link to Paper Search Results by DOI
  2. Ammonia Synthesis via Chemical Looping Using Nano-Confined Lithium Hydride in Alloy Matrix, HYDROGEN, 7(1), 20251226
    Link to Paper Search Results by DOI
  3. Durability on hydrogen absorption properties of TiFe0.7Mn0.3 with surface modification by TiO2, JOURNAL OF ALLOYS AND COMPOUNDS, 1057, 20260305
    Link to Paper Search Results by DOI
  4. Electrochemical Reaction of LiCoO2 Cathode With Optimized LiBH4-MgO Electrolyte in All-Solid-State Lithium-Ion Batteries, ENERGY STORAGE, 8(1), 20260130
    Link to Paper Search Results by DOI
  5. Catalytic influence of in-situ formed metal oxides using Na2CrO4 as precursor on the hydrogen sorption kinetics of MgH2, JOURNAL OF ENERGY STORAGE, 154, 20260410
    Link to Paper Search Results by DOI
  6. Thermodynamic and spectroscopic analysis of the ammonia absorption mechanism of a borohydride system, JOURNAL OF MATERIALS CHEMISTRY A, 14(10), 5925-5934, 20260210
    Link to Paper Search Results by DOI
  7. Study on Nitrogenation Reaction Mechanism in Li-Sn Alloy by Observation of Microstructural Change, ACS OMEGA, 11(5), 8323-8327, 20260210
    Link to Paper Search Results by DOI
  8. Catalytic alteration in hydrogen storage properties of MgH2 by adding CaTiO3, JOURNAL OF ENERGY STORAGE, 132, 20251015
    Link to Paper Search Results by DOI
  9. Ammonia synthesis via catalytic and chemical-looping process mediated by sodium-nitrogen solid solution, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 149, 20250718
    Link to Paper Search Results by DOI
  10. Tuning the thermodynamics and kinetics of magnesium-based materials for hydrogen energy storage: a review, MATERIALS CHEMISTRY AND PHYSICS, 343, 20251001
    Link to Paper Search Results by DOI
  11. Copper oxide-PANI derived novel composites for the kinetic tuning of MgH2, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 137, 1057-1063, 20250612
    Link to Paper Search Results by DOI
  12. Exploring the cycling solid-state hydrogen storage performance in lithium Hydride-Porous silicon composite, CHEMICAL ENGINEERING JOURNAL, 512, 20250515
    Link to Paper Search Results by DOI
  13. Understanding the kinetic enhancement of hydrogen sorption in MgH2 via KNbO3 through the perspective of the catalytic mechanism, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 120, 213-224, 20250417
    Link to Paper Search Results by DOI
  14. Effects of Oxide Morphology on Lithium-Ion Conductivity of LiBH4-Al2O3 Composites, ACS APPLIED ENERGY MATERIALS, 8(1), 518-528, 20241230
    Link to Paper Search Results by DOI
  15. Anti-oxidation effect of chromium addition for TiFe hydrogen storage alloys, JOURNAL OF ALLOYS AND COMPOUNDS, 1008, 20241215
    Link to Paper Search Results by DOI
  16. Enhancing the solid-state hydrogen storage properties of lithium hydride through thermodynamic tuning with porous silicon nanowires, ENERGY ADVANCES, 3(9), 2212-2219, 20240912
    Link to Paper Search Results by DOI
  17. Semi-empirical degradation rate estimation of TiFe1-XMnX alloy for thermochemical hydrogen compression durability tests, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 49, 11-18, 20240102
    Link to Paper Search Results by DOI
  18. Thermodynamic improvement of lithium hydrides for hydrogen absorption and desorption by incorporation of porous silicon, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 50, 1094-1102, 20240102
    Link to Paper Search Results by DOI
  19. An insight into the catalytic mechanism of perovskite ternary oxide for enhancing the hydrogen sorption kinetics of MgH2, JOURNAL OF ALLOYS AND COMPOUNDS, 970, 20240105
    Link to Paper Search Results by DOI
  20. Trace Ammonia Equilibrium Pressure of Zirconium Phosphate in Moisture, ACS OMEGA, 8(25), 23051-23055, 20230614
    Link to Paper Search Results by DOI
  21. Degradation and recovery properties in thermochemical hydrogen compression by using TiFe alloy, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 48(90), 35164-35169, 20231109
    Link to Paper Search Results by DOI
  22. Hydrogen carrier by ammonia borane-ammonia system with low-vapor pressure, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 48(70), 27298-27303, 20230815
    Link to Paper Search Results by DOI
  23. Ammonia Methanation of Carbon Dioxide with a Hybrid Catalyst, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 56(1), 20231231
    Link to Paper Search Results by DOI
  24. Isolation and characterization of blackish-brown BY2-melanin accumulated in cultured tobacco BY-2 cells, Bioscience, Biotechnology, and Biochemistry, 87(4), 395-410, 20230102
  25. Systematic study on catalysis of group 4–6 element oxide for magnesium hydride, Journal of Alloys and Compounds, 960, 170630, 20231015
  26. Thermal desorption processes of H2 and CH4 from Li2ZrO3 and Li4SiO4 materials absorbed H2O and CO2 in air at room temperature, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 48(24), 8830-8836, 20230319
    Link to Paper Search Results by DOI
  27. Catalysis of Sodium Alloys for Ammonia Synthesis around Atmospheric Pressure, ACS APPLIED ENERGY MATERIALS, 5(12), 15282-15289, 20221226
    Link to Paper Search Results by DOI
  28. Superdense state of the monolayer hydrogen on adsorbent under liquefied temperature, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 48(9), 3534-3540, 20230129
    Link to Paper Search Results by DOI
  29. Corrosion performance of carbide/nitride/oxide (C/N/O)-based reactor during thermochemical hydrogen production by Na redox reaction, JOURNAL OF ALLOYS AND COMPOUNDS, 918, 20221015
    Link to Paper Search Results by DOI
  30. Systematic Study on Nitrogen Dissociation and Ammonia Synthesis by Lithium and Group 14 Element Alloys, ACS APPLIED ENERGY MATERIALS, 5(4), 4765-4773, 20220425
    Link to Paper Search Results by DOI
  31. Regeneration Process of Ammonia-Absorbed Zirconium Phosphate to Zirconium Phosphate, ACS OMEGA, 7(24), 20881-20885, 20220621
    Link to Paper Search Results by DOI
  32. Improvement of Kinetics of Ammonia Synthesis at Ambient Pressure by the Chemical Looping Process of Lithium Hydride, JOURNAL OF PHYSICAL CHEMISTRY C, 126(5), 2403-2409, 20220210
    Link to Paper Search Results by DOI
  33. Room-Temperature Hydrogen Absorption of Ti with Robust Surface Coated by Hexagonal Boron Nitride, ACS APPLIED ENERGY MATERIALS, 5(1), 951-957, 20220124
    Link to Paper Search Results by DOI
  34. Development of Ca-Mg-H-2-ZrCl4 composite for hydrogen storage applications, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 46(69), 34362-34368, 20211006
    Link to Paper Search Results by DOI
  35. Catalytic Activities of Various Niobium Oxides for Hydrogen Absorption/Desorption Reactions of Magnesium, ACS OMEGA, 6(36), 23564-23569, 20210914
    Link to Paper Search Results by DOI
  36. Hydrogen storage behavior of TiFe alloy activated by different methods, MATERIALS LETTERS-X, 9, 202103
    Link to Paper Search Results by DOI
  37. Temperature rise of LaNi5-based alloys by hydrogen adsorption, CHEMICAL COMMUNICATIONS, 57(74), 9374-9377, 20210921
    Link to Paper Search Results by DOI
  38. Synergetic NH3 absorption properties of the NaBH4-LiBH4 mixed system, CHEMICAL COMMUNICATIONS, 57(49), 6003-6006, 20210621
    Link to Paper Search Results by DOI
  39. Analysis of sodium generation by sodium oxide decomposition on corrosion resistance materials: a new approach towards sodium redox water-splitting cycle, RSC ADVANCES, 11(34), 21017-21022, 20210623
    Link to Paper Search Results by DOI
  40. Synergetic NH3 absorption properties of the NaBH4–LiBH4 mixed system, Chemical Communications, 57(49), 6003-6006, 20210617
  41. Analysis of sodium generation by sodium oxide decomposition on corrosion resistance materials: a new approach towards sodium redox water-splitting cycle, RSC Advances, 11(34), 21017-21022, 20210609
  42. Synergetic NH3 absorption properties of the NaBH4–LiBH4 mixed system, Chemical Communications, 57(49), 6003-6006, 20210623
  43. Hydrogen Production via Thermochemical Water Splitting Process by Alkali Metal Redox Cycle, JOURNAL OF THE JAPAN INSTITUTE OF ENERGY, 100(5), 29-44, 202105
  44. Study of cyclic performance of V-Ti-Cr alloys employed for hydrogen compressor, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 43(5), 2881-2889, 2018
  45. Metal hydride-based materials towards high performance negative electrodes for all-solid-state lithium-ion batteries, CHEMICAL COMMUNICATIONS, 51(48), 9773-9776, 2015
  46. Evaluation of the enthalpy change due to hydrogen desorption for M-N-H (M = Li, Mg, Ca) systems by differential scanning calorimetry, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 40(3), 1516-1522, 2015
  47. Catalytic modification in dehydrogenation properties of KSiH3, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 16(47), 26163-26167, 2014
  48. Catalytic modification in dehydrogenation properties of KSiH3, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 16(47), 26163-26167, 2014
  49. Anode properties of magnesium hydride catalyzed with niobium oxide for an all solid-state lithium-ion battery, CHEMICAL COMMUNICATIONS, 49(64), 7174-7176, 2013
  50. Improvement of reaction kinetics by metal chloride on ammonia and lithium hydride system, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 37(21), 16025-16030, 2012
  51. Anomalous hydrogen absorption on non-stoichiometric iron-carbon compound, JOURNAL OF ALLOYS AND COMPOUNDS, 507(2), 547-550, 2010
  52. Hydrogen storage properties of lithium silicon alloy synthesized by mechanical alloying, JOURNAL OF POWER SOURCES, 196(1), 504-507, 2011
  53. Molecular hydrogen carrier with activated nanohydride and ammonia, JOURNAL OF MATERIALS RESEARCH, 24(7), 2185-2190, 2009
  54. The reaction process of hydrogen absorption and desorption on the nanocomposite of hydrogenated graphite and lithium hydride, NANOTECHNOLOGY, 20(20), 2009
  55. Electron Spin Resonance Investigation of Hydrogen Absorption in Ball-Milled Graphite, JOURNAL OF PHYSICAL CHEMISTRY C, 113(14), 5409-5416, 2009
  56. Characterization of hydrogen absorption/desorption states on lithium-carbon-hydrogen system by neutron diffraction, JOURNAL OF APPLIED PHYSICS, 104(5), 2008
  57. Hydrogen desorption properties of Li-BN-H system synthesized by mechanical milling, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 33(12), 3128-3131, 2008
  58. Hydrogen storage properties of nano-structural carbon and metal hydrides composites, PHYSICA B-CONDENSED MATTER, 383(1), 51-52, 2006
  59. Electron tunneling experiments on la-substituted Kondo-semiconductor CeRhAs, PHYSICA B-CONDENSED MATTER, 383(1), 26-27, 2006
  60. Thermodynamic and Spectroscopic Analyses of Zirconium Phosphate-Absorbed Ammonia, JOURNAL OF PHYSICAL CHEMISTRY C, 125(7), 3758-3763, 20210225
    Link to Paper Search Results by DOI
  61. Synthesis of Highly Activated Magnesium by Niobium and Tantalum Gel Oxide Catalyst, MATERIALS TRANSACTIONS, 62(2), 284-289, 2021
    Link to Paper Search Results by DOI
  62. Surface-Controlled Conversion of Ammonia Borane from Boron Nitride, ENERGIES, 13(21), 202011
    Link to Paper Search Results by DOI
  63. Effective Factor on Catalysis of Niobium Oxide for Magnesium, ACS OMEGA, 5(34), 21906-21912, 20200901
    Link to Paper Search Results by DOI
  64. Proton-based solid acids for ammonia absorption in ammonia water, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 45(41), 22189-22194, 20200821
    Link to Paper Search Results by DOI
  65. Concentration-composition-isotherm for the ammonia absorption process of zirconium phosphate, RSC ADVANCES, 10(35), 20882-20885, 20200601
    Link to Paper Search Results by DOI
  66. Eutectic melting in x(2LiBH(4)-MgH2) hydrogen storage system by the addition of KH, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 45(34), 17000-17005, 20200703
    Link to Paper Search Results by DOI
  67. Surface modification effects of graphite for selective hydrogen absorption by titanium at room temperature, CHEMICAL COMMUNICATIONS, 56(53), 7237-7240, 20200707
    Link to Paper Search Results by DOI
  68. Critical Temperature and Pressure Conditions of Degradation during Thermochemical Hydrogen Compression: A Case Study of V-Based Hydrogen Storage Alloy, ENERGIES, 13(9), 202005
    Link to Paper Search Results by DOI
  69. The catalytic effect of ZrCl4 on thermal dehydrogenation LiAlD4, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 45(28), 14413-14417, 20200521
    Link to Paper Search Results by DOI
  70. Pseudo catalytic ammonia synthesis by lithium-tin alloy, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 45(11), 6806-6812, 20200228
    Link to Paper Search Results by DOI
  71. Understanding the mechanism of photochromism in double-layer metal oxide using X-ray photoelectron spectroscopy, CHEMICAL PHYSICS LETTERS, 739, 202001
    Link to Paper Search Results by DOI
  72. Vanadium Hydride as Conversion Type Negative Electrode for All-Solid-State Lithium-Ion-Battery, MATERIALS TRANSACTIONS, 60(10), 2183-2187, 2019
    Link to Paper Search Results by DOI
  73. Room-Temperature Hydrogen Absorption of Titanium with Surface Modification by Organic Solvents, JOURNAL OF PHYSICAL CHEMISTRY C, 123(32), 19269-19274, 20190815
    Link to Paper Search Results by DOI
  74. Hydrogen Sorption and Cyclic Compressor Performance Of V40Ti21.5Cr33.5M5 (M = Nb, Zr, Fe) Alloys, JOURNAL OF THE JAPAN INSTITUTE OF ENERGY, 98(7), 157-164, 201907
    Link to Paper Search Results by DOI
  75. Synthesis of sodium-magnesium amidoborane by sodium amide: An investigation of functional properties for hydrogen/ammonia storage, JOURNAL OF ALLOYS AND COMPOUNDS, 801, 645-650, 20190915
    Link to Paper Search Results by DOI
  76. Review on Ammonia Absorption Materials: Metal Hydrides, Halides, and Borohydrides, ACS APPLIED ENERGY MATERIALS, 1(2), 232-242, 201802
    Link to Paper Search Results by DOI
  77. Highly purified hydrogen production from ammonia for PEM fuel cell, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 43(31), 14486-14492, 20180802
    Link to Paper Search Results by DOI
  78. Eutectic Phenomenon of LiNH2-KH Composite in MH-NH3 Hydrogen Storage System, MOLECULES, 24(7), 20190405
    Link to Paper Search Results by DOI
  79. Hybrid nickel-metal hydride/hydrogen battery, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 44(8), 4263-4270, 20190208
    Link to Paper Search Results by DOI
  80. Operando spectroscopic analyses for the ammonia absorption process of sodium borohydride, CHEMICAL COMMUNICATIONS, 55(15), 2150-2153, 20190221
    Link to Paper Search Results by DOI
  81. Hydrogen Desorption Isobar Properties of Ti1.1CrMn at High Temperatures and Pressures, MATERIALS TRANSACTIONS, 59(5), 855-857, 2018
    Link to Paper Search Results by DOI
  82. Ammonia, a Switch for Controlling High Ionic Conductivity in Lithium Borohydride Ammoniates, JOULE, 2(8), 1522-1533, 20180815
    Link to Paper Search Results by DOI
  83. MgH2-CoO: a conversion-type composite electrode for LiBH4-based all-solid-state lithium ion batteries, RSC ADVANCES, 8(41), 23468-23474, 2018
    Link to Paper Search Results by DOI
  84. Study of cyclic performance of V-Ti-Cr alloys employed for hydrogen compressor, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 43(5), 2881-2889, 20180201
    Link to Paper Search Results by DOI
  85. Development of Mg-Li-B based advanced material for onboard hydrogen storage solution, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 42(7), 3963-3970, 20170216
    Link to Paper Search Results by DOI
  86. Doping effect of Nb species on hydrogen desorption properties of AlH3, JOURNAL OF ALLOYS AND COMPOUNDS, 734, 55-59, 20180215
    Link to Paper Search Results by DOI
  87. A new synthesis route of ammonia production through hydrolysis of metal - Nitrides, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 42(39), 24897-24903, 20170928
    Link to Paper Search Results by DOI
  88. Improved hydrogen release from magnesium borohydride by ZrCl4 additive, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 42(35), 22342-22347, 20170831
    Link to Paper Search Results by DOI
  89. Ammonia suppression during decomposition of sodium amide by the addition of metal hydride, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 42(35), 22388-22394, 20170831
    Link to Paper Search Results by DOI
  90. Study on the thermal decomposition of NaBH4 catalyzed by ZrCl4, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 42(35), 22432-22437, 20170831
    Link to Paper Search Results by DOI
  91. Catalytic effect of bis (cyclopentadienyl) nickel II on the improvement of the hydrogenation dehydrogenation of Mg-MgH2 system, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 42(27), 17178-17183, 20170706
    Link to Paper Search Results by DOI
  92. How does TiF4 affect the decomposition of MgH2 and its complex variants? - An XPS investigation, JOURNAL OF MATERIALS CHEMISTRY A, 5(30), 15543-15551, 20170814
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  93. Micro-alloyed Mg2Ni for better performance as negative electrode of Ni-MIS battery and hydrogen storage, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 42(8), 5220-5226, 20170223
    Link to Paper Search Results by DOI
  94. Thermal decomposition of sodium amide, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 42(8), 5213-5219, 20170223
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  95. Enhancement of hydrogen desorption kinetics in magnesium hydride by doping with lithium metatitanate, JOURNAL OF ALLOYS AND COMPOUNDS, 711, 400-405, 20170715
    Link to Paper Search Results by DOI
  96. Nitrogen Dissociation via Reaction with Lithium Alloys, ACS OMEGA, 2(3), 1081-1088, 201703
    Link to Paper Search Results by DOI
  97. Surface modification of MgH2 by ZrCl4 to tailor the reversible hydrogen storage performance, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 42(9), 6152-6159, 20170302
    Link to Paper Search Results by DOI
  98. Synthesis, structural characterization, and hydrogen desorption properties of Na[Al(NH2BH3)(4)], INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 42(9), 6173-6180, 20170302
    Link to Paper Search Results by DOI
  99. Synthesis, Characterization, and Structure of a Reduced Preyssler-type Polyoxometalate, CHEMISTRY LETTERS, 46(4), 602-604, 201704
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  100. Bulk-Type All-Solid-State Lithium-Ion Batteries: Remarkable Performances of a Carbon Nanofiber-Supported MgH2 Composite Electrode, ACS APPLIED MATERIALS & INTERFACES, 9(3), 2261-2266, 20170125
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  101. Two-Peak Mystery of LiNH2 NaH Dehydrogenation Is Solved? A Study of the Analogous Sodium Amide/Lithium Hydride System, JOURNAL OF PHYSICAL CHEMISTRY C, 120(49), 27903-27909, 20161215
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  102. Catalytic hydrolysis of sodium borohydride on Co catalysts, INTERNATIONAL JOURNAL OF ENERGY RESEARCH, 40(15), 2078-2090, 201612
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  103. Hydrogen Ab/Desorption of LiH-KH Composite and Ammonia System, MATERIALS TRANSACTIONS, 57(7), 1215-1219, 2016
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  104. High compressed hydrogen production via direct electrolysis of liquid ammonia, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 41(33), 14529-14534, 20160907
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  105. Electrochemical Performance of Titanium Hydride for Bulk-Type All-Solid-State Lithium-Ion Batteries, MATERIALS TRANSACTIONS, 57(5), 755-757, 201605
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  106. Destabilization of lithium hydride by the substitution of group 14 elements: A review, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 41(14), 5969-5978, 20160420
    Link to Paper Search Results by DOI
  107. Correlation between particle size and hydrogen generation properties on ammonia and lithium hydride system, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 40(43), 14911-14915, 20151116
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  108. Anode properties of Al2O3-added MgH2 for all-solid-state lithium-ion batteries, JOURNAL OF SOLID STATE ELECTROCHEMISTRY, 19(12), 3639-3644, 201512
    Link to Paper Search Results by DOI
  109. Activation on Ammonia Absorbing Reaction for Magnesium Chloride, JOURNAL OF PHYSICAL CHEMISTRY C, 119(47), 26296-26302, 20151126
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  110. Tailoring the absorption-desorption properties of KSiH3 compound using nano-metals (Ni, Co, Nb) as catalyst, JOURNAL OF ALLOYS AND COMPOUNDS, 645, S144-S147, 20151005
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  111. Catalysis of Lithium Chloride and Alkali Metal Borohydrides on Hydrogen Generation of Ammonia and Lithium Hydride System, JOURNAL OF PHYSICAL CHEMISTRY C, 119(34), 19922-19927, 20150827
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  112. ★, In-Situ XAS for Niobium Oxide Catalyst on Hydrogen Absorption and Desorption of Magnesium, JOURNAL OF THE JAPAN INSTITUTE OF METALS, 79(3), 107-111, 2015
  113. ★, Catalysis of nickel nanoparticles with high thermal stability for ammonia decomposition, APPLIED CATALYSIS A-GENERAL, 491, 184-188, 2015
  114. ★, Synthesis of nickel nanoparticles with excellent thermal stability in micropores of zeolite, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 38(31), 13579-13586, 2013
  115. Effects of Metal Oxide Additives on Anode Properties of Magnesium Hydride for All-Solid-State Lithium Ion Batteries, Journal of the Fuel Society of Japan, 93(9), 926-930, 2014
  116. Improvement of hydrogen desorption kinetics in the LiH-NH3 system by addition of KH, CHEMICAL COMMUNICATIONS, 47, 12227-12229, 2011
  117. Superior Hydrogen Exchange Effect in the MgH2-LiBH4 System, JOURNAL OF PHYSICAL CHEMISTRY C, 114, 13132-13135, 2010
  118. Thermochemical Energy Storage by Water-splitting Via Redox Reaction of Alkali Metals, 49, 934-2014
  119. Thermochemical Water-splitting Reaction by Alkali Metal-Cobalt Oxide, Journal of the Fuel Society of Japan, 92(9), 909-912, 2013
  120. Thermochemical Hydrogen Production by Water-splitting at Low Temperature, 42(7), 7-11, 201307
  121. Thermochemical Hydrogen Production by Alkali Metal Redox Cycle, 14(1), 48-52, 2014
  122. Research on Hydrogen and Ammonia Production by Solar Heat Energy, 56(5), 274-277, 201410
  123. "Hydrogen and Materials Characteristic in Solids II", The Journal of the Japan Institute of Metals.A, 79(3), 77-77, 2015
  124. ★, Kinetic Modification on Hydrogen Desorption of Lithium Hydride and Magnesium Amide System, MATERIALS, 8, 3896-3909, 2015
  125. Thermodynamics on Ammonia Absorption of Metal Halides and Borohydrides, JOURNAL OF PHYSICAL CHEMISTRY C, 118(32), 18412-18416, 2014
  126. ★, Microscopic characterization of metal-carbon-hydrogen composites (metal5Li, Mg), Journal of Applied Physics, 114(9), 93509-1-093509-7, 201309
  127. Structure and catalytic properties of Ni/MWCNTs and Ni/AC catalysts for hydrogen production via ammonia decomposition, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 39(1), 277-287, 2014
  128. Microstructure and hydrogen desorption characteristics of hydrogenated ScH2-MBn (M = Mg and Ca) systems synthesized by mechanical milling, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 38(16), 6744-6749, 2013
  129. ★, Synthesis and characterization of magnesium-carbon compounds for hydrogen storage, CARBON, 56, 50-55, 2013
  130. Destabilization of LiH by Li Insertion into Ge, JOURNAL OF PHYSICAL CHEMISTRY C, 117(11), 5650-5657, 2013
  131. Correlation between electrochemical behavior and hydrogen storage properties of Li-Sn system, JOURNAL OF ALLOYS AND COMPOUNDS, 580, S211-S215, 2013
  132. ★, Hydrogen absorption of catalyzed magnesium below room temperature, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 38(31), 13728-13733, 2013
  133. Improved hydrogen desorption from lithium hydrazide by alkali metal hydride, JOURNAL OF ALLOYS AND COMPOUNDS, 580, S320-S323, 2013
  134. Ammonia Synthesis via Non-Equilibrium Reaction of Lithium Nitride in Hydrogen Flow Condition, JOURNAL OF THE JAPAN INSTITUTE OF METALS, 77(12), 580-584, 2013
  135. ★, Chemical Hydrogen Storage of Carbon Material, JOURNAL OF THE JAPAN INSTITUTE OF METALS, 77(12), 552-558, 2013
  136. Hydrogen production via thermochemical water-splitting by lithium redox reaction, JOURNAL OF ALLOYS AND COMPOUNDS, 580, S410-S413, 2013
  137. Synthesis of Calcium Borohydride by Milling Hydrogenation of Hydride and Boride, JOURNAL OF THE JAPAN INSTITUTE OF METALS, 77(12), 609-614, 2013
  138. Catalytic Effect of Niobium Oxide on Hydrogen Absorption and Desorption Process for Magnesium, JOURNAL OF THE JAPAN INSTITUTE OF METALS, 77(12), 636-640, 2013
  139. ★, Low-temperature water-splitting by sodium redox reaction, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 37(23), 17709-17714, 2012
  140. Lithium hydrazide as a potential compound for hydrogen storage, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 37(7), 5750-5753, 2012
  141. Comparative Study of Structural Changes in NH3BH3, LiNH2BH3, and KNH2BH3 During Dehydrogenation Process, JOURNAL OF PHYSICAL CHEMISTRY C, 116(9), 5957-5964, 2012
  142. ★, Compressed hydrogen production via reaction between liquid ammonia and alkali metal hydride, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 36(14), 8217-8220, 2011
  143. Solid state NMR study on the thermal decomposition pathway of sodium amidoborane NaNH2BH3, JOURNAL OF MATERIALS CHEMISTRY, 21(8), 2609-2615, 2011
  144. ★, Hydrogen Desorption Reaction between Hydrogen-Containing Functional Groups and Lithium Hydride, JOURNAL OF PHYSICAL CHEMISTRY C, 114(18), 8668-8674, 2010
  145. ★, Synthesis and characterization of lithium-carbon compounds for hydrogen storage, JOURNAL OF ALLOYS AND COMPOUNDS, 509(3), 719-723, 2011
  146. Thermal decomposition of alkaline-earth metal hydride and ammonia borane composites, International Journal of Hydrogen Energy, 35(22), 12405-12409, 201011
  147. ★, Ammonia Synthesis via Non-Equilibrium Reaction of Lithium Nitride in Hydrogen Flow Condition, MATERIALS TRANSACTIONS, 56(3), 410-414, 2015
  148. Tunneling measurements of CeRhAs single crystal, Physica B: Condensed Matter, 378(1), 786-787, 20060501
  149. ★, Thermodynamic and structural properties of ball-milled mixtures composed of nano-structural graphite and alkali(-earth) metal hydride, Journal of Alloys and Compounds, 432(1), 303-307, 20070425
  150. Hydrogen storage properties in a composite of lithium hydride and boron nitride with hydrocarbon groups, JOURNAL OF ALLOYS AND COMPOUNDS, 446, 39-43, 2007
  151. Recyclable hydrogen storage system composed of ammonia and alkali metal hydride, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 34(24), 9760-9764, 2009
  152. ★, Hydrogen storage properties of hydrogenated graphite destabilized by mixing with lithium hydride, Tanso, 45(226), 2-7, 20070115
  153. Hydrogenation properties of lithium intercalated graphite, TANSO, 136-139, 2008
  154. Ammoniaborane as Hydrogen Storage Material, Ceramics Japan, 46(3), 191-195, 2011
  155. Thermochemical Hydrogen Production by Low Temperature Water Splitting(Hydrogen Production from Renewable Energy), Journal of the Japan Institute of Energy, 94(1), 19-26, 20150120
  156. Structural and Electronic Interplay in the Gap Formation in CeRhAs1-xSbx (0 < x < 1), Tokyo Sugaku Kaisya Zasshi, 73(1), 262-268, 2004

Publications such as books

  1. 2026/01/08, Science and Technology of Hydrogen Energy, 2026, 1, Textbook, Contributor, Hiroki Miyaoka, 978-4-339-06676-0
  2. 2024, Hydrogen energy system, Research and development of ammonia synthesis technique by alkali metal compounds, HESS, 2024, Scholarly Book, Single work, Hiroki Miyaoka
  3. 2024, Ferrum, Research activity for hydrogen production and storage in Hiroshima University, 2024, Scholarly Book, Joint work, Hiroki Miyaoka, Takayuki Ichikawa
  4. 2024, Frontier of clean hydrogen and ammonia utilization, Thermochemical hydrogen production by low temperature exhaust heat, 2024, Scholarly Book, Joint work, Hiroki Miyaoka
  5. 2016, Solar to Chemical Energy Conversion, Thermochemical Water Splitting by Concentrated Solar Power, Springer International Publishing, 2016, 0, Scholarly Book, Joint work, English, 978-3-319-25400-5
  6. 2013, New and Future Development in Catalysis -Catalysis in Batteries, Hydrogen Storage Materials, 2013, Yoshitsugu Kojima, Hiroki Miyaoka, Takayuki Ichikawa
  7. 2011, Advances in Diverse Industrial Applications of Nanocomposites, Hydrogen Storage Properties of Hydrogenated Graphite and Lithium Hydride Nanocomposite, 2011, Takayuki Ichikawa, Hiroki Miyaoka and Yoshitsugu Kojima

Invited Lecture, Oral Presentation, Poster Presentation

  1. Research on Ammonia Synthesis via Chemical Looping by Alkali Metal Compounds, Hiroki Miyaoka, Koki Tsunematsu, Hitoshi Saima, Takayuki Ichikawa, iSHES 2025 (1st International Symposium on Hydrogen and Energy Storage), 2025/10, With Invitation, English, iSHES, Shenzhen, China
  2. Research on Hydrogen Storage techniques in JST-GteX and Hiroshima University, Hiroki Miyaoka, China-Japan-ROK Youth Low-Carbon Forum 2025, 2025/10, With Invitation, English, JST, Hangzhou, China
  3. Research on Ammonia Synthesis by Alkali Metal Compounds, Hiroki Miyaoka, Koki Tsunematsu, Takayuki Ichikawa, THERMEC 2025, 2025/06, With Invitation, English, THERMEC, Tours, France
  4. Ammonia Synthesis via Catalytic and Chemical Looping Process by Alkali Metal Compounds, Hiroki Miyaoka, KIM-JIMM symposium, 2024/10/29, With Invitation, English, Jinbu, Korea
  5. Research on Ammonia absorption materials, Hiroki Miyaoka, KRI Workshop 2024, 2024/10/25, With Invitation, Japanese, KRI
  6. Research on Catalytic Mechanism of Transition Metal Oxides for Magnesium, Hiroki Miyaoka, The Japan Australia China Korea Singapore 2024 hydrogen forum (JACKS 2024), 2024/10/23, With Invitation, English, The Japan Australia China Korea Singapore 2024 hydrogen forum (JACKS 2024)
  7. Hydrogen production by sodium redox cycle as conversion technique of low temperature heat, Hiroki Miyaoka, Hydrogen Power Theoretical & Engineering Solutions International Symposium (HYPOTHESIS) XIX, 2024/07/14, With Invitation, English, Organizing committee of HYPOTHESIS XIX, International conference center Hiroshima, Hiroshima, Japan
  8. Hydrogen Storage Properties of Ammonolysis Systems, Hiroki Miyaoka, International Symposium on Energy Storage Technologies for Sustainable Future 2024, 2024/03/07, With Invitation, English, Sresh Gyan Vihar University, Sresh Gyan Vihar University, India
  9. Metal hydride and ammonia systems for effective and rechargeable hydrogen storage, Hiroki Miyaoka, THERMEC 2023, 2023/07/07, With Invitation, English, THERMEC 2023, Viena, Austria
  10. Research on Catalysis of Various Niobium Oxide for Magnesium as Hydrogen Storage Materials, Hiroki Miyaoka, Taipei International Conference on Catalysis (TICC-2022), 2022/07/20, With Invitation, English, 20220720, Online
  11. Pseudo Catalytic Ammonia Synthesis by Lithium-Tin Alloy with Gas-switching Process, Hiroki Miyaoka, THERMEC 2021, 2021/05/09, With Invitation, English, 20210509, Online
  12. Nitrogen Dissociation and Pseudo Catalytic Ammonia Synthesis by Lithium Alloy, Hiroki Miyaoka, IUPAC 15th International Conference on Novel Materials and their Synthesis (NMS-XIV), 2019/09/06, With Invitation, English, IUPAC, Guangzhou, China
  13. Green Hydrogen Production via Thermochemical Water-Splitting by Sodium-Redox Cycle and Low Temperature Heat, Hiroki Miyaoka, The 3rd International Symposium on Fuels and Energy (ISFE2019), 2019/07/08, With Invitation, English
  14. Study on catalytic activation for Mg hydrogen storage, Hiroki Miyaoka, Hiroyuki Gi, Keita Shinzato, Takashi Ogi, Masahiro Sadakane, Takayuki Ichikawa, Study of matter at extreme conditions (SMEC2019), 2019/03/20, With Invitation, English, US
  15. Research on Catalytic Mechanism of Niobium Oxide for Hydrogen Storage Properties of Magnesium, Hiroki Miyaoka, IUPAC 14th International Conference on Novel Materials and their Synthesis (NMS-XIV), 2018/10/23, With Invitation, English, IUPAC, Guangzhou, China
  16. Highly Purified Hydrogen Production from Ammonia for Fuel Cell Vehicles, Hiroki Miyaoka, Yoshitsugu Kojima, Takayuki Ichikawa, IUPAC 13th International Conference on Novel Materials and their Synthesis (NMS-XIII), 2017/10/17, With Invitation, English, IUPAC, Nanjing, China
  17. Reaction Properties of Lithium alloys with Nitrogen, Hiroki Miyaoka, IUPAC 12th International Conference on Novel Materials and their Synthesis (NMS-XII), 2016, With Invitation, English, Changsha, China
  18. Hydrogen production via thermochemical and electrochemical hybrid process by sodium alloy, Hiroki Miyaoka, THERMEC 2016, 2016, With Invitation, English, Graz, Austria
  19. Kinetics of Niobium Oxide Catalyzed Magnesium, Hiroki Miyaoka, Takayuki Ichikawa, Yoshitsugu Kojima, Frontiers in Materials Processing Applications, Research & Technology (FiMPART' 15), 2015/06/13, With Invitation, English, Hyderabad, India
  20. Ammonia and Alkali Metal Hydride System as Hydrogen Storage, Hiroki Miyaoka, International Conference on Composites/nano Engineering (ICCE-23), 2015/07/14, With Invitation, English, Chengdu, China
  21. Hydrogen Storage and Generation Properties of Ammonia and Alkali Metal Hydride System, Hiroki Miyaoka, IUPAC 10th International Conference on Novel Materials and their Synthesis (NMS-X), 2014, With Invitation, English, Zhengzhou, China
  22. Hydrogen Production via Thermochemical Water-Splitting by Alkali Metal Cycle, Hiroki Miyaoka, Takayuki Ichikawa, Yoshitsugu Kojima, 6th Forum on New Materials in 13th International Conference on Modern Materials and Technologies (CIMTEC 2014), 2014, With Invitation, English, Montecatini Terme, Italy
  23. Ammonia and alkali metal hydride system for hydrogen storage, Hiroki Miyaoka, Takayuki ichikawa, Yoshitsugu Kojima, THERMEC 2013, 2013, With Invitation, English, Las Vegas, USA
  24. Thermochemical Water-Splitting by Alkali Metal Redox Cycle, Hiroki Miyaoka, Takayuki Ichikawa, Yoshitsugu Kojima, 9th IUPAC International Conference on Novel Materials and their Synthesis (NMS-IX), 2013, With Invitation, English, Shanghai, China
  25. Sodium Redox Reaction Based System for Thermochemical Hydrogen Production, Hiroki Miyaoka, Takayuki Ichikawa, Yoshitsugu Kojima, IUPAC 8th International Conference on Novel Materials and Synthesis (NMS-VIII), 2012, With Invitation, English, Xi-An, China

Awards

  1. 2025/10/30, outstanding research award, International Symposium on Hydrogen and Energy Storage 2025 (iSHES25), Research on Ammonia Synthesis via Chemical Looping by Alkali Metal Compounds
  2. 2012/12/09, Best Oral Award, 3rd Special Symposium on Advances in Functional Materials (AFM-3), Energy Conversion by Redox Reaction of Alkali Metals
  3. 2014/07/29, Best Presentation Award (in area III Solar Thermal Applications), Grand Renewable Energy 2014 (GRE2014), Thermochemical water-splitting by alkali metal redox cycle
  4. 2016/09/23, Poster Award (JIM2016 fall annual meeting), 公益社団法人日本金属学会会長

External Funds

Acceptance Results of Competitive Funds

  1. 2025
  2. KAKENHI(Grant-in-Aid for Scientific Research (A)), 2024, 2028
  3. The Green Technologies for Excellence , 2023//1/0/, 2024//3//3
  4. Intensive Support Program for Young Promising Researchers, 2022//0/9/, 2023//0/9/
  5. 2022/10
  6. 2022/10, 2024/09
  7. 2022
  8. 2022/10
  9. 2022/06, 2024/05
  10. KAKENHI(Grant-in-Aid for Scientific Research (B)), 2020, 2022
  11. KAKENHI(Grant-in-Aid for Scientific Research on Innovative Areas), 2019, 2020
  12. KAKENHI, 2017/04/01, 2020/03/31
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  13. KAKENHI, 2015, 2016
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  14. 2013/04/01, 2014/03/31
  15. 2012/04/01, 2013/03/31
  16. 2012/01/01, 2012/12/31
  17. 2007/04/01, 2009/02/28
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  18. 2006/04/01, 2007/03/31

Social Activities

Organizing Academic Conferences, etc.

  1. 4th ISSD Workshop on Sustainable Science, 2014/11, 2014/11
  2. 5th PU-HU Symposium on Advanced materials for Energy, 2016/03, 2016/03
  3. 2nd Hiroshima International Symposium on Sustainability Sciences, 2014/11, 2014/11
  4. 3rd Workshop on Advanced Materials for Energy, 2013/10, 2013/10
  5. 2nd ISSD Workshop on Sustainable Science, 2012/08, 2012/08
  6. ISSD Workshop on Sustainable Science, 2011/11, 2011/11
  7. Hiroshima International Symposium on Sustainability Sciences, 2012/08, 2012/08