論文 - 池田 茂
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Kaori Takagi, Tomoya Ota, Kota Kato, Ryota Tomizawa, Tomoya Nagano, Koji Hayashi, Akira Yamakata, Yoshitaro Nose, Nobuya Machida, Shigeru Ikeda
ACS Applied Energy Materials 8 ( 16 ) 11961 - 11969 2025年8月
共著
担当区分：最終著者, 責任著者
Calcium titanate (CaTiO3) has attracted interest as a photocatalyst for overall water splitting, but its efficiency remains limited. In this study, CaTiO3 powders codoped with aluminum (Al3+), scandium (Sc3+), and magnesium (Mg2+) cations were synthesized via a flux-mediated method. XRD and Raman analyses confirmed the formation of single-phase perovskite structures with successful dopant incorporation at the B-site (Ti4+). Appreciable particle growth was observed in the Al3+-doped sample. Codoping with Sc3+ significantly reduced particle size but also lowered crystallinity, which hindered photocatalytic activity. Further codoping with Mg2+ effectively suppressed the formation of deep-level defects. As a result, the CaTiO3 powder codoped with Al3+, Sc3+, and Mg2+ (CaTiO3:Al,Sc,Mg) exhibited the highest photocatalytic activity, achieving an apparent quantum yield (AQY) of 73.8% (at 310 nm). Durability tests showed that degradation occurred primarily on the loaded cocatalysts, not the CaTiO3 itself. Transient absorption measurements revealed enhanced carrier reactivity due to trap state modulation and improved lifetimes in the CaTiO3:Al,Sc,Mg sample. Band alignment studies indicated that CaTiO3 has a more negative conduction band minimum than that of strontium titanate (SrTiO3). These findings demonstrate that strategic doping significantly enhances the photocatalytic properties of CaTiO3 for various reactions.
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Enhanced photoelectrochemical performance of Zr-doped BiVO4 photoanode deposited by co-sputtering
Shukur Gofurov, Daryl Ide, Lingga Ghufira Oktariza, Muhammad M. Islam, Shigeru Ikeda, Takeaki Sakurai
Thin Solid Films 2025年6月
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Tomoya Ota, Ryota Tomizawa, Tomoya Nagano, Koji Hayashi, Shigeru Ikeda
Materials Advances 6 3455 - 3459 2025年4月
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Ferrocene-Based Organic Semiconductors: Evaluating Intermolecular Transfer Integrals and Transistor Properties
Hiroki Sano, Muneyuki Naito, Kosuke Katagiri, Shigeru Ikeda, Atsushi Kimoto, Tomofumi Kadoya
ACS Applied Electronic Materials 2024年11月
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Characterization of the electronic structure of sputter-deposited Mo-doped BiVO4 thin-film photoanodes 査読あり
L. Oktariza, Y. Sato, S. Gofurov, K. Ozawa, M. M. Islam, S. Ikeda, T. Sakurai
Jpn. J. Appl. Phys. 63 02SP41 2024年1月
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Shigeru Ikeda, Riku Okamoto, Akira Kimura, Yuhi Nakayasu, Akira Yamakata, Ryota Tomizawa, Taizo Masuda, Koichiro Nakatani
Sustainable Energy & Fuels 8 202 - 209 2023年11月
担当区分：筆頭著者, 責任著者 出版者・発行元：Royal Society of Chemistry (RSC)
A high photocatalytic performance for overall water splitting was demonstrated over a photocatalyst based on a magnesium and scandium co-doped strontium titanate particle composed of a cubic shape having a nanosized step structure on the edge of the particle.
DOI： 10.1039/d3se01408h
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Crystalline-face-dependent photoelectrochemical properties of single crystalline CuGaSe2 photocathodes for hydrogen evolution under sunlight radiation 招待あり 査読あり
Shigeru Ikeda, Wakaba Fujita, Ryoji Katsube, Yoshitaro Nose, Hajime Suzuki, Ryu Abe, Kenji Yoshino
Electrochimica Acta 454 142384 - 142384 2023年4月
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Crystalline phase control of BiVO4 thin films using RF sputtering 査読あり
N. Uezono, J. Liu, P. A. Sachin, M. M. Islam, S. Ikeda, T. Sakurai
Jpn. J. Appl. Phys. 62 SK1001 2023年3月
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W. Septina, Y. Kawasaki, T. Harada, S. Ikeda
J. Cryst. Growth 602 ( 14 ) 126975 2023年1月
担当区分：最終著者
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Tooru Tanaka, Ryusuke Tsutsumi, Tomohiro Yoshinaga, Takaki Sonoyama, Katsuhiko Saito, Qixin Guo, Shigeru Ikeda
RSC Advances 13 575 - 583 2022年12月
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H. Cai, G. Xiao, W. Zhao, X. Wu, Y. Hu, H. Ni, S. Ikeda, Y. H. Ng
Adv. Sci. 10 ( 5 ) 2205726 2022年12月
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Xiaomin Wu, Weidong Zhao, Yucheng Hu, Guohong Xiao, Huanyang Ni, Shigeru Ikeda, Yunhau Ng, Feng Jiang
ADVANCED SCIENCE 9 ( 33 ) 2022年11月
出版者・発行元：WILEY
The ternary compound photovoltaic semiconductor Cu3BiS3 thin film-based photoelectrode demonstrates a quite promising potential for photoelectrochemical hydrogen evolution. The presented high onset potential of 0.9 V-RHE attracts much attention and shows that the Cu3BiS3 thin films are quite good as an efficient solar water splitting photoelectrode. However, the CdS buffer does not fit the Cu3BiS3 thin film: the conduction band offset between CdS and Cu3BiS3 reaches 0.7 eV, and such a high conduction band offset (CBO) significantly increases the interfacial recombination ratio and is the main reason for the relatively low photocurrent of the Cu3BiS3/CdS photoelectrode. In this study, the InxCd1-xS buffer layer is found to be significantly lowered the CBO of CBS/buffer and that the In incorporation ratio of the buffer influences the CBO value of the CBS/buffer. The Pt-TiO2/In0.6Cd0.4S/Cu3BiS3 photocathode exhibits an appreciable photocurrent density of approximate to 12.20 mA cm(-2) at 0 V-RHE with onset potential of more than 0.9 V-RHE, and the ABPE of the Cu3BiS3-based photocathode reaches the highest value of 3.13%. By application of the In0.6Cd0.4S buffer, the Cu3BiS3-BiVO4 tandem cell presents a stable and excellent unbiased STH of 2.57% for over 100 h.
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Shogo Ishizuka, Riku Okamoto, Shigeru Ikeda
Advanced Materials Interfaces 9 ( 25 ) 2201266 - 2201266 2022年9月
担当区分：最終著者 出版者・発行元：Wiley
その他リンク： https://onlinelibrary.wiley.com/doi/full-xml/10.1002/admi.202201266
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Self-flux method in sputtered BiVO4 films for enhanced photoelectrochemical performance 査読あり
J. Liu, N. Uezono, K. Tajima, S. Pawar, M. M. Islam, S. Ikeda, T. Sakurai
ACS Appl. Energy Mater. 5 4191 - 4201 2022年4月
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S. Ikeda, T. H. Nguyen, R. Okamoto, I. Abdellaoui, M. M. Islam, T. Harada, R. Abe, T. Sakurai
Phys. Chem. Chem. Phys. 24 ( 1 ) 468 - 476 2021年11月
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Shigeru Ikeda, Riku Okamoto, Shogo Ishizuka
119 ( 8 ) 083902 - 083902 2021年8月
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J. Liu, K. Tajima, I. Abdellaoui, M. M. Islam, S. Ikeda, T. Sakurai
Energies 14 ( 8 ) 2122-1 - 2122-10 2021年4月
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Mechanism of incorporation of zirconium into BiVO4 visible-light photocatalyst 査読あり
I. Abdellaoui, M. M. Islam, M. Remeika, S. Kanno, R. Okamoto, K. Tajima, Y.-H. Ng, C. Budich, T. Maeda, T. Wada, S. Ikeda, T. Sakurai
The Journal of Physical Chemistry C 125 ( 6 ) 3320 - 3326 2021年2月
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3.17% efficient Cu2ZnSnS4-BiVO4 integrated tandem cell for standalone overall solar water splitting 査読あり
D. Huang, K. Wang, L. Li, K. Feng, N. An, S. Ikeda, Y. Kuang, Y. H. Ng, F. Jiang
Energy & Environmental Science 14 ( 3 ) 1480 - 1489 2021年1月
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Preparation of a CuGaSe2 single crystal and its photocathodic properties 招待あり 査読あり
S. Ikeda, W. Fujita, R. Okamoto, Y. Nose, R. Katsube, K. Yoshino, T. Harada
RSC Advances 10 ( 66 ) 40310 - 40315 2020年11月