論文 - 東 智弘
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Maximizing Oxygen Evolution Performance of NiFeOx Semitransparent Electrocatalysts Applicable to Photoelectrochemical Water Splitting Device 招待あり 査読あり
Koichi Yoshiyama, Tomohiro Higashi, Tian Xiao, Kenji Yoshino
ChemNanoMat 2025年
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Selective Chromium Dissolution as an Interfacial Design Strategy for Enhanced Oxygen Evolution Activity in CrFeCoNi Oxy-carbide Films 招待あり 査読あり
Tian Xiao, Koichi Yoshiyama, Kenji Yoshino, Tomohiro Higashi
Discover Electrochemistry 2025年
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Estimating the quasi-Fermi level of holes at the surface of semiconductor photoanodes using outer-sphere redox couples 査読あり 国際共著
Yuu Shioiri , Keisuke Obata , Yudai Kawase , Tomohiro Higashi , Masao Katayama , Markus Schleuning , Roel van de Krol , Dennis Friedrich , Fatwa Abdi, Kazuhiro Takanabe
Nature Communications 2025年
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Yudai Kawase, Tomohiro Higashi, Keisuke Obata, Fuminao Kishimoto, Yuriy Pihosh, Kazunari Domen, Kazuhiro Takanabe
Chemistry of Materials 36 2390 - 2401 2024年
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Chemistry of Materials
Uniform nanolayer coatings on photoelectrodes for water splitting are effective in improving their durability by isolating the semiconductor from direct contact with liquid electrolytes. Achieving a thin and uniform coating across the entire surface of nanostructured uneven photoelectrodes using wet processes remains a challenge. This study provides a strategy for the spontaneous formation of a uniform nanolayer of NiFeOx electrocatalyst on Ta3N5 nanorods (NRs) photoelectrodes mediated by acetonitrile (CH3CN) solvent and bulky metal ethylhexanoate complexes. Following the NiFeOx deposition through a spin-coating method on Ta3N5 NRs, the sample is immersed in CH3CN solvent for 12 h. This treatment effectively results in complete coverage of the complex structured surface of Ta3N5 NRs by the NiFeOx nanolayer. The nanocoating ensures the protection of Ta3N5 NRs and contributes to enhanced durability. This distinctive surface modification is applied to semitransparent Ta3N5 NRs photoanodes which is applicable to photovoltaic-photoelectrochemical tandem cells. This simple immersion method of bulky metal complexes into a thin and uniform layer on rough surfaces would have potential for various applications including (photo)electrochemical reactions and corrosion inhibitions.
DOI： 10.1021/acs.chemmater.3c03041
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Photoelectrochemical properties of p-type CuBi2O4 prepared by spray pyrolysis of carbon-free precursor aqueous solution combined with post-annealing treatment 査読あり
Kaisei Wakishima, Tomohiro Higashi, Akira Nagaoka, Kenji Yoshino
New Journal of Chemistry 48 131 - 143 2024年
担当区分：責任著者 掲載種別：研究論文（学術雑誌） 出版者・発行元：Royal Society of Chemistry (RSC)
<jats:p>CuBi<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub> photoelectrodes were fabricated by a spray pyrolysis method using a carbon-free precursor solution. The optimized CuBi<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub> generated a photocurrent of −0.94 mA cm<jats:sup>−2</jats:sup><jats:italic>via</jats:italic> H<jats:sub>2</jats:sub>O<jats:sub>2</jats:sub> reduction at 0.6 V<jats:sub>RHE</jats:sub> under simulated sunlight illumination.</jats:p>
DOI： https://doi.org/10.1039/d3nj04878k
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Operando measurement of electrocatalyst potential on particulate photocatalysts for overall water splitting 査読あり
Yudai Kawase, Keisuke Obata, Yuu Shioiri, Tomohiro Higashi, Kazuhiro Takanabe
Journal of Materials Chemistry A 2024年
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Interfacial Design of Particulate Photocatalyst Materials for Green Hydrogen Production 招待あり 査読あり
Tomohiro Higashi, Kazunari Domen
ChemSusChem 2024年
担当区分：筆頭著者 記述言語：英語 掲載種別：研究論文（学術雑誌）
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Understanding the Activation Mechanism of RhCrOx Cocatalysts for Hydrogen Evolution with Nanoparticulate Electrodes 査読あり
Tomohiro Higashi, Kazuhiko Seki, Vikas Nandal, Yuriy Pihosh, Mamiko Nakabayashi, Naoya Shibata, Kazunari Domen
ACS Applied Materials & Interfaces － 2024年
担当区分：筆頭著者, 責任著者 記述言語：英語 掲載種別：研究論文（学術雑誌）
DOI： https://doi.org/10.1021/acsami.4c04841
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Development of Thermally Stable FTO Thin Films on Quartz Substrates for Carrier Collection in Semiconductor Photoelectrodes 査読あり
Tomohiro Higashi, Shintaro Fukagawa, Kaisei Wakishima, Koichi Yoshiyama, Yuki Narita, Kenji Yoshino
Journal of Materials Chemistry C 2024年
担当区分：筆頭著者, 責任著者 記述言語：英語 掲載種別：研究論文（学術雑誌）
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Nagaoka A., Miura S., Nakashima K., Hirai Y., Higashi T., Yoshino K., Nishioka K.
Applied Physics Letters 125 ( 7 ) 2024年
掲載種別：研究論文（学術雑誌） 出版者・発行元：Applied Physics Letters
The lack of attractive n-type thermoelectric materials greatly restricts their applications because most high-performance materials are p-type conductors, such as the kesterite compound Cu2ZnSnS4. This study reports high-quality n-type kesterite (Cu1−xAgx)2ZnSnS4 (CAZTS) single crystals that exhibit a record high dimensionless figure of merit value of 1.1 at approximately 800 K, primarily owing to Ag alloying, cation compositional optimization, and intrinsic low thermal conductivity. An n-type CAZTS-based single-leg device was fabricated using a Mo-barrier layer. The device exhibited a thermoelectric conversion efficiency of 3.4% at a temperature gradient of 473 K. This study provides insights into developing thermoelectric modules using environmentally friendly kesterite materials.
DOI： 10.1063/5.0220909
DOI： 10.1063/5.0220909
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Tantalum Nitride-Enabled Solar Water Splitting with Efficiency Above 10% 査読あり
Yuriy Pihosh, Vikas Nandal, Tomohiro Higashi, Ryota Shoji, Raman Bekarevich, Hiroshi Nishiyama, Taro Yamada, Valeria Nicolosi, Takashi Hisatomi, Hiroyuki Matsuzaki, Kazuhiko Seki, Kazunari Domen
Advanced Energy Materials 2023年
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Mechanistic Insights into Enhanced Hydrogen Evolution of CrOx/Rh Nanoparticles for Photocatalytic Water Splitting 査読あり
Tomohiro Higashi, Kazuhiko Seki, Yutaka Sasaki, Yuriy Pihosh, Vikas Nandal, Mamiko Nakabayashi, Naoya Shibata, Kazunari Domen
Chemistry – A European Journal 2023年
担当区分：筆頭著者, 責任著者 掲載種別：研究論文（学術雑誌）
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Cation-Doped SrTaO2N Prepared through a Flux Method for Visible-Light-Driven Water Splitting 査読あり
Keisuke Obata, Tomohiro Higashi, Feifan Ye, Masao Katayama, Kazuhiro Takanabe
ChemPhotoChem 2023年
掲載種別：研究論文（学術雑誌）
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Active BaTaO2N Photocatalysts Prepared from Amorphous Ta2O5 Precursor for Overall Water Splitting under Visible Light 査読あり
Shinji Nishimae;Junie Jhon;M. Vequizo;Yasunobu Inoue;Akira Yamakata;Mamiko Nakabayashi;Tomohiro Higashi;Kazunari Domen
Journal of Materials Chemistry A 2023年
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Nanostructured Tantalum Nitride for Enhanced Solar Water Splitting 査読あり
Yuriy Pihosh, Vikas Nandal, Ryota Shoji, Raman Bekarevich, Tomohiro Higashi, Valeria Nicolosi, Hiroyuki Matsuzaki, Kazuhiko Seki, Kazunari Domen
ACS Energy Letters 2023年
掲載種別：研究論文（学術雑誌）
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Co-doping of a La5Ti2Cu0.9Ag0.1O7S5 photocatalyst (λ < 700 nm) with Ga and Al to enhance photocatalytic H2 evolution 査読あり
Xiaojun Wang, Zhenhua Pan, Junie Jhon, M. Vequizo, Takashi Hisatomi, Swarnava Nandy, Tomohiro Higashi, Lihua Lin, Jiadong Xiao, Tsuyoshi Takata, Akira Yamakata, Wei Yan, Kazunari Domen
Chemical Communications 2023年
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Low-Temperature Growth of ZnMgO Thin Films by Atmospheric Spin-Coating Using Diethylzinc Solution 査読あり
Kenji Yoshino, Himeka Tominaga, Yuta Komaki, Masato Imai, Tomohiro Higashi, Takashi Minemoto, Qing Shen, Shuzi Hayase
Journal of Electronic Materials 2023年
担当区分：責任著者 掲載種別：研究論文（学術雑誌）
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Physicochemical Insights into Semiconductor Properties of Semitransparent Tantalum Nitride Photoanode for Solar Water Splitting 査読あり
Tomohiro Higashi, Hiroshi Nishiyama, Yuriy Pihosh, Kaisei Wakishima, Yudai Kawase, Yutaka Sasaki, Akira Nagaoka, Kenji Yoshino, Kazuhiro Takanabe, Kazunari Domen
Physical Chemistry Chemical Physics 2023年
担当区分：筆頭著者, 責任著者 記述言語：英語 掲載種別：研究論文（学術雑誌）
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Electrochemical Properties of BaTaO2N Photocatalyst with Visible-Light-Driven Water Splitting Capability 査読あり
Tomohiro Higashi, Shinji Nishimae, Yasunobu Inoue, Yosuke Kageshima, Kazunari Domen
ChemPhotoChem 2023年
担当区分：筆頭著者, 責任著者 掲載種別：研究論文（学術雑誌）
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Physicochemical insights into semiconductor properties of a semitransparent tantalum nitride photoanode for solar water splitting 査読あり
東 智弘
Physical Chemistry Chemical Physics 25 20737 - 20748 2023年
掲載種別：研究論文（学術雑誌） 出版者・発行元：Royal Society of Chemistry (RSC)
<jats:p>Self-conductivity of semitransparent Ta<jats:sub>3</jats:sub>N<jats:sub>5</jats:sub> on an insulating quartz substrate promotes carrier transfer from the interior of Ta<jats:sub>3</jats:sub>N<jats:sub>5</jats:sub> to the external circuit, enabling efficient solar water splitting without the insertion of a conductive layer.</jats:p>
DOI： 10.1039/d3cp02563b