Efficient and stable visible-light-driven Z-scheme overall water splitting using an oxysulfide H2 evolution photocatalyst

Lihua Lin, Yiwen Ma, Junie Jhon M. Vequizo, Mamiko Nakabayashi, Chen Gu, Xiaoping Tao, Hiroaki Yoshida, Yuriy Pihosh, Yuta Nishina, Akira Yamakata, Naoya Shibata, Takashi Hisatomi, Tsuyoshi Takata and Kazunari Domen ()
Additional contact information
Lihua Lin: Shinshu University
Yiwen Ma: Shinshu University
Junie Jhon M. Vequizo: Shinshu University
Mamiko Nakabayashi: The University of Tokyo
Chen Gu: Shinshu University
Xiaoping Tao: Shinshu University
Hiroaki Yoshida: Science and Innovation Center, Mitsubishi Chemical Corporation, Aoba-ku
Yuriy Pihosh: Office of University Professors, The University of Tokyo
Yuta Nishina: Okayama University
Akira Yamakata: Okayama University
Naoya Shibata: The University of Tokyo
Takashi Hisatomi: Shinshu University
Tsuyoshi Takata: Shinshu University
Kazunari Domen: Shinshu University

Nature Communications, 2024, vol. 15, issue 1, 1-12

Abstract: Abstract So-called Z-scheme systems permit overall water splitting using narrow-bandgap photocatalysts. To boost the performance of such systems, it is necessary to enhance the intrinsic activities of the hydrogen evolution photocatalyst and oxygen evolution photocatalyst, promote electron transfer from the oxygen evolution photocatalyst to the hydrogen evolution photocatalyst, and suppress back reactions. The present work develop a high-performance oxysulfide photocatalyst, Sm2Ti2O5S2, as an hydrogen evolution photocatalyst for use in a Z-scheme overall water splitting system in combination with BiVO4 as the oxygen evolution photocatalyst and reduced graphene oxide as the solid-state electron mediator. After surface modifications of the photocatalysts to promote charge separation and redox reactions, this system is able to split water into hydrogen and oxygen for more than 100 hours with a solar-to-hydrogen energy conversion efficiency of 0.22%. In contrast to many existing photocatalytic systems, the water splitting activity of the present system is only minimally reduced by increasing the background pressure to 90 kPa. These results suggest characteristics suitable for applications under practical operating conditions.

Date: 2024
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DOI: 10.1038/s41467-024-44706-4

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