国立大学法人宮崎大学　イオニクス材料設計研究室

学術論文　Paper

2023年
70. Effect of transition element dissolution on ytterbium-doped barium-zirconate-based protonic ceramic fuel cells
Y. Mikami, Y. Sekitani, K. Yamauchi, T. Kuroha, Y. Okuyama, ACS Applied Energy Materials, (2024) inpress（査読あり）

69. Improved durability of protonic ceramic fuel cells with BaZr0.8Yb0.2O3-δ electrolyte by introducing porous BaZr0.1Ce0.7Y0.1Yb0.1O3-δ buffer interlayer
H. Shimada, Y Mikami, Kosuke Yamauchi, T. Kuroha, T. Uchi, K. Nakamura, S. Kobayashi, R. M. Matsuda, Y. Okuyama, Yasunobu Mizutani, M. Mori, Ceramics International (2023) inpress （査読あり）

68. Analyzing elementary electrode reaction for protonic ceramic fuel cells by peoron/deuteron isotope effect
Y. Okuyama*, K. Kasuga, M. Shimomura, Y. Mikami, K. Yamauchi, T. Kuroha, H. Sumi,
Journal of Power Sources 586(2023) 233647(査読あり)

67. Evaluation of Hydrogen Ions Flowing through Protonic Ceramic Fuel Cell Using Ytterbium-Doped Barium Zirconate as Electrolyte
Y. Okuyama*, Y. Harada, K. Yamauchi, Y. Mikami, T. Kuroha, H. Shimada, Y. Yamaguchi, Y. Mizutani, Journal of The Electrochemical Society, 170 (2023) 084509(査読あり)

66.Ultra-elevated power density and high energy efficiency of protonic ceramic fuel cells: Numerical and experimental results
K. Li, H. shimada*, Y. Mizutani, Y. Okuyama, T. Araki*, Energy Conversion and Management 296(2023)117678.（査読あり）

65. Investigation of degradation mechanisms by overpotential evaluation for protonic ceramic fuel cells
Hirofumi Sumi*, Hiroyuki Shimada, Konosuke Watanabe, Yuki Yamaguchi, Katsuhiro Nomura, Yasunobu Mizutani, Ryuma Malik Matsuda, Masashi Mori, Keiji Yashiro, Takuto Araki, Yuji Okuyama, Journal of Power Sources (2023) 233528 (査読あり)

64. Phonons damped by proton doping in barium zirconate
Hikaru Takehara, Masaya Nagai, Masaaki Ashida, Yuji Okuyama,Yukimune Kani, The Journal of Physical Chemistry (2023) in press(査読あり)

63. Mechanisms of photoluminescence in cerium oxide pellets with different types of defects
Masaya Nagai, Yuto Furutani, Hikaru Takehara, Masaaki Ashida, Yuji Okuyama,Yukimune Kani, Journal of Luminescence (2023) in press　(査読あり)

62.External Current Dependence of Polarization Resistances for Reversible Solid Oxide and Protonic Ceramic Cells with Current Leakage
Hirofumi Sumi, Hiroyuki Shimada, Konosuke Watanabe, Yuki Yamaguchi, Katsuhiro Nomura, Yasunobu Mizutani, Yuji Okuyama, ACS Applied Energy Materials , in press(査読あり)

61.Determining the Atomic Arrangement Near the Oxygen Vacancy in Yttrium-Doped Barium Zirconate by Photoluminescence Spectroscopy, H. Takehara, M. Nagai, MM. Ashida, Y. Okuyama, Y. Kani, The Journal of Physicalhemistry, in press(査読あり)

2022年
60. Machine learning based prediction of space group for Ba(Ce0.8- x Zr x )Y0.2O3 perovskite-type protonic conductors
K. Nomura, H. Shimada, Y. Yamaguchi, H. Sumi, Y. Mizutani, Y. Okuyama, W. Shin*, Ceramics International 49 (2023) 5058-5065(査読あり)

59. Tailored and improved protonic conductivity through Ba(ZxCe10−x)0.08Y0.2O3−δ ceramics perovskites type oxides for electrochemical devices, K. leonard*, Y. Okuyama, M. E. Ivanova, W. A. Meulenberg, H. Matsumoto, ChemElectroChem 9(2022) e202101663(査読あり)

58. Phase Transitions, Thermal Expansions, Chemical Expansions, and CO₂ Resistances of Ba(Ce_0.8-xZr_xY_0.1Yb_0.1)O_3-δ (x = 0.1, 0.4) Perovskite-Type Proton Conductors, K. Nomura*, H. Shimada, Y. Yamaguchi,W. Shin, Y. Okuyama, Y. Mizutani, Journal of The Electrochemical Society, 169, 2 (2022)024516.(査読あり)

2021年

57. Evaluation of the oxygen migration energy in doped ceria by terahertz spectroacopy
M. Nagai*, Y. Furutani, H. Takehara, T. Morimoto, M. Ashida, Y. Okuyama, Y. Kani, Physical Review Applid16(2021)064069（査読あり）

56. Accelerated Discovery of Proton-Conducting Pervskite Oxide by Capturing Physicochemical Fundamentals of Hydration
J. Hyodo, K. Tsujikawa, M. Shiga, Y. Okuyama, Y. Yamazaki*, ACS Energy Letters 6 (2021) 2985-2992(査読あり)

55. Optimum dopant of barium zirconate electrolyte for manufacturing of protonic ceramic fuel cells
T. Kuroha*, Y. Niina, M. Shudo, G. Sakai, N.Matsunaga, T. Goto, K. Yamauchi, Y. Mikami, and Y. Okuyama*, Journal of power sources, 506 (2021) 230134(査読あり)

54. Comparison of Electrochemical Impedance Spectra for Electrolyte-supported Solid Oxide Fuel Cells (SOFCs) and Protonic Ceramic Fuel Cells (PCFCs)
H. Sumi*, H. Shimada, Y. Yamaguchi, Y. Mizutani, Y. Okuyama, K. Amezawa, Scientific Reports(2021)11, 10622(査読あり)

53. 機械学習を用いたペロブスカイト酸化物におけるプロトン濃度の予測精度評価
辻川皓太、兵頭潤次、志賀元紀、奥山勇治、山崎仁丈、燃料電池 20 (2021) 4 75-86.(査読あり)

52. Assessing the atomic structure of the defect complex in a solid electrolyte by photoluminescence measurements
N. Tanimoto, M. Nagai*, M. Ashida, Y. Okuyama, Y. Kani, Japanese Journal of Appliied Physics, (2021)60, 032004(査読あり)

51. Determination of oxide ion conductivity in Ba-doped LaYbO3 proton-conducting pervskites via an oxygen isotope exchange method
J. Hyodo, S. Kato, S. Ida, T. Ishihara, Y. Okuyama*, T. Sakai*, The Journal of Physical Chemistry C, (2021) 125(3)1703-1713(査読あり)

2020年

50. Numerical analysis of current efficiency distributions in a protonic ceramics fuel cell using Nerunst-Planck-Poisson model
K. Li*, T. Araki, T. Kawamura, A. Ota, Y. Okuyama, International Journal of Hydrogen Energy, (2020) 45, 34139-34149.(査読あり)

49. Oxygen affinity: the missing link enabling predication of proton conductivities in doped barium zirconates
Y. Yamazaki*, A. Kuwabara, J. Hyodo, Y. Okuyama, C. Fisher, S. Haile, Chemistry of Materials, (2020)32, 7292-7300(査読あり)

48. Fast and stable proton conduction in heavily scandium-doped polycrystalline barium zirconate at intermediate temperatures
J. Hyodo, K. Kitabayashi, K. Hoshino, Y. Okuyma, Y. Yamazaki*, Advanced Energy Materials, (2020) open access(査読あり)

2019年
47. Effect of added Ni on defect structure and proton transport properties of indium-doped barium zirconate
T. Kuroha*, K. Yamauchi, Y. Mikami, Y. Tsuji, Y. Niina, M. Shudo, G. Sakai, N. Matsunaga, and Y. Okuyama**
International Journal of Hydrogen Energy, 45 (2020) 3123-3131(査読あり)

46. Hydrogen Production Combining Steam Reform and Electrolysis by Electrochemical Cell using Proton Conducting Oxide
Y. Okuyama*, S. Nagatomo, A. Niisaka, N. Matsunaga, G. Sakai, Y. Sasamata, Y. Ogura, Y. Mizutani, ECS Transaction, 91, (1)(2019)2653-2659.(SOFC16 Proceeding 査読あり)

45.Microscopic ion migration in solid electrolytes revealed by terahertz time-domain spectroscopy
T. Morimoto, M. Nagai*, Y. Minowa, M. Ashida, Y. Yokotani, Y. Okuyama & Y. Kani, Nature Communications 10, 2662 (2019.6)(査読あり)

44.Evaluation of the Electronic and Local Structure of Mn in Proton-Conducting Oxide, Ca(Zr,Mn)O3-δ to Elucidate a Direct Hydrogen-Dissolution Reaction
M. Oishi*, T. Nakamura, I. Watanabe, T. Yamamoto, T. Doi, T. Ina, K. Nitta, K. Amezawa, Y. Okuyama, The Journal of Physical Chemistry 123(2019)16034-16045.(査読あり)

2018年
43. Efficient intermediate-temperature steam electrolysis with Y:SrZrO3-SrCeO3 and Y:BaZrO3-BaCeO3 Proton Conducting perovskites
K. Leonard, Y. Okuyama,Y. Takamura, Y. Lee, K. Miyazaki, M. E. Ivanova, W. A. Meulenberg and H. Matsumto*, Journal of Materials Chemistry A, 6(2018)19113-19124(査読あり)

42.Experimental and theoretical approaches for the investigation of proton conductive characteristics of La1-xBaxYbO3-δ
Y. Obukuro*, Y. Okuyama, G. Sakai, S. Matsushima, Journal of Alloys and Compounds 770(2019)294-300(査読あり)

41.Energy efficiency of ionic transport through proton conducting ceramics electrolytes for energy conversion applications
Takashi Nakamura*, Shusuke Mizunuma, Yuta Kimura, Yuichi Mikami, Kousuke Yamauchi,
Tomohiro Kuroha, Noboru Taniguchi, Yoichiro Tsuji, Yuji Okuyama, Koji Amezawa, Journal of Materials Chemistry A, 6(2018)15771-15780(査読あり)

2017年
40.固体電解質センサによるディーゼル排気ガス中の水素濃度測定
常吉孝治、高橋総子、岩井翔、奥山勇治、自動車技術会論文　48, (6)(2017)1171-1175.(査読あり)

39. Proton conduction and incorporation into La1-xBaxYb0.5In0.5O3-δ
Yuji Okuyama*, Takuya Yamaguchi, Naoki Matsunaga, Go Sakai, Materials Transactions 58,12(2017) （査読あり）

38. A Direct Methane Fuel Cell with Double-Layered Electrolyte using Proton conducting Oxide
Yuji Okuyama*, Shigemichi Kawano, Go Sakai, Naoki Matsunaga, Yasunobe Mizutani, ECS Transaction, 78, (1)(2017)1953-1961.(SOFC15 Proceeding 査読あり)

37.First-principles study on LaYbO3 as the localized f electrons containing system with MBJ-LDA +U approach
Yuki Obukuro, Yuji Okuyama, Go Sakai*, Shigenori Matsushima*, and Masao Arai, Computational Materials Science 126(2017) 7-11(査読あり）

36.Infulence of Dopant levels on the Hydration properties of SZCY and BZCY Proton Conducting Ceramics for Hydrogen Production,
K. Leonard. Y.S. Lee Y. Okuyama, K. Miyazaki, A. Staykov and H. Matsumoto*, International Journal of Hydrogen Energy 42(2017)3926-3937 (査読あり)

2016年
35. Proton-conducting oxide with redox protonation and its application to a hydrogen sensor with a self-standard electrode
Y. Okuyama*, S. Nagamine, A. Nakajima, Go. Sakai, N. Matsunaga, F. Takahashi, K. Kimata, T. Oshima, K. Tsuneyoshi, RSC Advances 6(2016)34019-34026. (査読あり)

34.Peculiar Crystal Growth of the Trivalent Titanium Derived TiO2-SnO2 Precursor under Hydrothermal Conditions
G. Sakai*, A. Tanaka, T.Sueda, T.Ogata, Y.Okuyama, N. Matsunaga, Chemistry Letters, 45(2016) 318-320.(査読あり)

33. Effects of La doping on structural, optical, electronic properties of Sr2Bi2O5 photocatalyst
Y. Obukuro, S. Matsushima*, K. Obata, T. Suzuki, M. Arai, E. Asato, Y. Okuyama, N. Matsunaga, G. Sakai*, Journal of Alloys and Compounds, 658(2016)139-146. (査読あり)

2015年
32. Improvement of proton Ceramic Fuel Cells with Thin Film BCZY Electrolyte
Y. Okuyama*, N. Ebihara, K. Okuyama, Y. Mizutani, ECS Transaction, 68(2015)2545-2553.(SOFC14 Proceeding 査読あり)

31. Formation of CaFe2O4 porous structure by addition of Zr in malic acid complex
Y. Obukuro, K. Obata, R. Maeda, S. Matsushima*, Y. Okuyama, N. Matsunaga, G. Sakai*, Journal of the Ceramic Society of Japan 123(19)(2015)1-4.(査読あり）

30. Preparation and Characterization of heterobimetallic complex, Sr[Bi(DTPA)]・9H2O, derived La-doped Sr2Bi2O5
Y. Obukuro, G. Sakai*, Y. Okuyama, N. Matsunaga, S. Matsushima*, K. Obata, E. Asato, Chemistry Letters, 44(2015)890-892.(査読あり)

29. Intermediate temperture Steam electrolysis using perovskite type proton conductor,
T. Sakai*, K. Arakawa, M. Ogushi, T. Ishihara, H. Matsumoto, Y. Okuyama, Journal of Solid State Electrochemistry,19(2015)1793-1798.(査読あり)

28. Incorporation and conduction of proton in SrCe_0.9-xZr_xY_0.1O_3-δ
Y. Okuyama*, K. Isa, Y.S. Lee, T. Sakai, H. Matsumoto, Solid State Ionics 275(2015)35-38(査読あり)

2014年
27. Proton transport properties of La_0.9Sr_0.1Yb_0.8In_0.2O_3-δ and its application to proton ceramic fuel cell
Y. Okuyama*, K. Okuyama, Y. Mizutani, T. Sakai, Y.S. Lee, H. Matsumoto, International of Hydrogen Energy 39(2014)20829-20836 (査読あり)

26. 溶融銅用起電力型水素センサの実用化
栗田典明、奥山勇治、大島智子、木股幸司、寺西祐紀、武津典彦^＊、銅と銅合金 53(2014)171-176.（査読あり）

25.Incorporation and conduction of proton in Sr-doped LaMO₃ (M=Al, Sc, In, Yb, Y)
Y. Okuyama*, T. Kozai, S. Ikeda , M. Matsuka, T. Sakai, H. Matsumoto, Electorochimica Acta 125(2014)443-449. (査読あり)

24.PCFC Performance of Using the Nano-Structured LSCF Cathode by Bead-Milling Method
H. Oda*, Y. Okuyama, T. Sakai, H. Matsumoto,Materials Transactions 55(2014)722-727. (査読あり）

23.Incorporation of a proton into La_0.9Sr_0.1(Yb_1-xM_x)O_3-δ (M= Y, In)
Y. Okuyama*, S. Ikeda, T. Sakai and H. Matsumoto,Solid State Ionics 262(2014)865-869. （査読あり）

22.Preparation of nano-structured cathode for PCFC by bead-milling method
H. Oda*, T. Sakai, Y. Okuyama, H. Matsumoto,Solid State Ionics 262(2014)388-391（査読あり）

2013年
21.Proton trapping in yttrium-doped barium zirconate
Y. Yamazaki*, F. Blanc, Y. Okuyama, L. Buannic, J. C. Lucio-Vega, C. P. Grey, and S. M. Haile,Nature Materials, 12(2013)647-651.（査読あり）

20.Electrochemical hydrogen pumps using Ba doped LaYbO₃ type proton conducting electrolyte
T. Sakai*, K. Isa, M. Matsuka, T. Kozai, Y. Okuyama, T. Ishihara, H. Matsumoto, International Journal of Hydrogen Energy 38(2013)6842-6847.（査読あり）

19.Proton transport properties of La_0.9M_0.1YbO_3-δ (M=Ba, Sr, Ca, Mg)
Y. Okuyama*, T. Kozai, T. Sakai, M. Matsuka, H. Matsumoto, Electrochimica acta95(2013)54-59.（査読あり）

18.Proton-conducting oxide and applications to hydrogen energy devices
H. Matsumoto*, T. Sakai, Y.Okuyama, Pure Appl. Chem. 85(2013)427-435（査読あり）

2012年
17.Long-term stability of sulfated hydrous titania-based electrolyte for water electrolysis
S.-J. Kim, T. Sakai, H. Oda, Y. Okuyama, Y. Mizutani, J. Hamagami, M. Matsuka, T. Ishihara and H. Matsumoto*, J Solid State Electrochem, 16(2012)3587-3592（査読あり）

16.Effect of doped ceria interlayer on cathode performance of the electrochemical cell using proton conducting oxide
T. Sakai*, S. Matsushita, J. Hyodo, Y. Okuyama, M. Matsuka, T. Ishihara, H. Matsumoto
Electrochimica Acta 75(2012)179-184.（査読あり）

15.Properties of Electric Conductivity in Y-Doped CaZrO3
J. Bao*, N. Kurita, Y. Okuyama, Z. Shi, N. Fukatsu, Materials Transactions 53(5) (2012)973-979.（査読あり）

14.Electromotive Force of the High-Temperature Concentration Cell Using Al-Doped CaZrO3 as the Electrolyte
J. Bao*, H. Ohno, N. Kurita, Y. Okuyama, N. Fukatsu, Materials Transactions 53(4) (2012)752-759.（査読あり）

13.Water electrolysis using water-absorbing porous electrolyte consisting of a sulfonated nanotitania proton conductor
S.-J. Kim, T. Sakai, H. Oda, J.-i. Hamagami, Y. Okuyama, M. Matsuka, S. Ohta, Y. Shimizu, T. Ishihara, H. Matsumoto*, Electrochemistry,80(4)(2012)246-248.（査読あり）

12.Determination of the maximum solubility of hydrogen in α-alumina by DC polarization method
Y. Okuyama*, N. Kurita, D. Sato, H. Douhara, N. Fukatsu, Solid State Ionics 213(2012)92-97. （査読あり）

11.The effect of annealing on the proton conductivity of Mg-doped α-Al2O3
Y. Okuyama*, N. Kurita, K, Katayama, N. Fukatsu, Ionics 18(2012)85-90（査読あり）

2011年
10.LiTaO3中への水素の溶解
石橋啓祐*、奥山勇治、栗田典明、武津典彦、日本金属学会誌75(2011)229-234（査読あり）

9.Proton conduction in Al-doped CaZrO3
J. Bao*, H. Ohno, N. Kurita, Y. Okuyama, N. Fukatsu, Electrochimica Acta (2011) 1062-1068（査読あり）

2010年
8.αアルミナを用いた電池型センサーによる溶融Cu-Ni合金中の水素濃度測定
奥山勇治*、栗田典明、武津典彦 銅と銅合金 49 (2010)292-296 （査読あり）

7.Electrical conductivity of calcium-doped α-alumina
Y. Okuyama*, N. Kurita and N. Fukatsu, Solid State Ionics 181(2010)142-147. （査読あり）

2009年
6.A new type of hydrogen sensor for molten metals usable up to 1600 K
Y. Okuyama*, N. Kurita, A. Yamada, H. Takami, T. Oshima, K. Katahira and N. Fukatsu, Electrochimica Acta 55 (2009) 470-474.（査読あり）

5.Incorporation of hydrogen in barium-doped α-alumina
Y. Okuyama*, N. Kurita and N. Fukatsu, Solid State Ionics 180 (2009) 175-182. （査読あり）

4.Diffusion of proton in alumina-rich nonstoichiometric magnesium aluminate spinel
Y. Okuyama*, N. Kurita and N. Fukatsu, Ionics 15 (2009) 43-48.（査読あり）

2008年
3.Electromotive Force of Gas Concentration Cell Using Alumina-Rich Nonstoichiometric Magnesium Aluminate Spinel as the Solid Electrolyte
Y. Okuyama*, N. Kurita and N. Fukatsu, Materials Transactions 49 (2008) 187-192.（査読あり）

2006年
2.Electrical Conductivity of Barium-Doped α-Alumina
Y. Okuyama*, N. Kurita and N. Fukatsu, Advanced Materials Research 11-12 (2006) 145-148.（査読あり）

1.Defect structure of alumina-rich nonstoichiometric magnesium aluminate spinel
Y. Okuyama*, N. Kurita and N. Fukatsu, Solid State Ionics 177 (2006) 59-64.（査読あり）

総説　review article

6. 機械学習を用いたペロブスカイト型酸化物中のプロトン伝導度予測
奥山勇治、堂園航汰　日本セラミックス協会誌 58 (2023) 727-731

5. プロトン伝導性セラミックスを用いた電気化学デバイス
奥山勇治　日本セラミックス協会誌　57 (2022) 710-714

4. コヒーレントテラヘルツパルスでみる燃料電池で用いられる固体電解質内の高速イオン伝導
永井正也、奥山勇治、可児幸宗　レーザー研究 50 (2022) 198-201

3. プロトン伝導性セラミックスの基礎研究と応用展開
奥山勇治、燃料電池 19 (2020) 7-15

2. 白金を分散したプロトン伝導性酸化物に見られるナノイオニクス
松本広重*、酒井孝明、奥山勇治　ケミカルエンジニアリング56 (2011)737-740(査読あり)

1. α-アルミナ単結晶のプロトン伝導性
奥山勇治*、栗田典明、武津典彦 Journal of MMIJ 125 (2009) 389-394 (査読あり)

書籍　book

1. 奥山勇治 「カーボンニュートラルに向けた水素製造・P2Gと関連技術の最新動向」シーエムシーリサーチ
第3章　プロトン伝導性セラミックスを用いた水素製造

その他　the others

1. 奥山勇治　プロトン伝導に魅せられて　日本金属学会誌まてりあ（はばたけ）47(2008) p326

2. 実験装置づくりから生まれるものは？　名古屋工業会会報ごきそ416(2007)p11

3. 奥山勇治、海外留学・滞在記　Electrochemistry 79 (6) p510

受賞　Award

9. 第17回固体イオニクスセミナーInterface Ionicss/SSI seminar Award 2023 Platinum Prize 受賞者：原田佳明(M2) 2023.08.09

8. 第60回化学関連支部合同九州大会電気化学セッション優秀研究発表賞 受賞者：東雲遥香(M1) 2023.07.01

7. 第59回化学関連支部合同九州大会電気化学セッション優秀研究発表賞 受賞者：藤本聖(M1) 2022.07.02

6.FCDICポスター賞（PACRIM13）受賞者：辻川皓太(M2) 2019.10.30

5.田川記念固体化学奨励賞（電気化学会固体化学の新しい指針を探る研究会) 受賞者：奥山勇治 2017.3.25

4.日本銅学会第48回論文賞 受賞者：奥山勇治 2014.11.08

3. 平成21年度電気化学会東海支部　若手研究者特別賞（ECS日本支部助成) 受賞者：奥山勇治

2. 平成18年度資源素材学会関西支部若手研究者・学生のために研究発表会　優秀発表賞 受賞者：奥山勇治

1. 平成15年日本金属学会・日本鉄鋼協会奨学賞 受賞者：奥山勇治

学内セミナー開催　Seminars

第1回　イオニクス材料設計セミナー　2014.04.07
持続可能な社会を目指した材料設計　固体酸化物を用いた太陽熱化学燃料製造
講師：山崎仁丈　先生（カリフォルニア工科大学客員研究員 現九州大学稲盛フロンティア研究センター教授）

第2回　イオニクス材料設計セミナー　2015.06.05
持続可能な社会を目指した次世代二次電池の開発　固体酸化物を用いた新型金属空気電池
講師：酒井孝明　先生（九州大学分子システム科学センター助教）

第3回　イオニクス材料設計セミナー　2015.06.30
固体酸化物形燃料電池（SOFC）システムの開発状況と将来展望
講師：鷲見裕史　先生（産業技術総合研究所）

第4回　イオニクス材料設計セミナー　2017.01.11
水素・燃料電池の現状と将来
講師：水谷安伸　先生(東邦ガス株式会社)

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