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Citation: Shanshan Chen, Takashi Hisatomi, Guijun Ma, Zheng Wang, Zhenhua Pan, Tsuyoshi Takata, Kazunari Domen. Metal selenides for photocatalytic Z-scheme pure water splitting mediated by reduced graphene oxide[J]. Chinese Journal of Catalysis, ;2019, 40(11): 1668-1672. doi: S1872-2067(19)63326-7 shu

Metal selenides for photocatalytic Z-scheme pure water splitting mediated by reduced graphene oxide

a Center for Energy & Environmental Science, Shinshu University, 4-17-1 Wakasato, Nagano-shi, Nagano 380-8553, Japan;
b Department of Chemical System Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

Received Date: 22 January 2019
Revised Date: 17 February 2019

Fund Project: This work was financially supported by the Artificial Photosynthesis Project of the New Energy and Industrial Technology Development Organization (NEDO) and Grant-in-Aids for Scientific Research (A) (No. 16H02417) and Young Scientists (A) (No. 15H05494) from the Japan Society for the Promotion of Science (JSPS).

Exploration of novel narrow bandgap semiconductors for overall water splitting is vital for the realization of practical solar H₂ production. In the work, solid solutions of zinc selenide and copper gallium selenide with absorption edge wavelengths ranging from 480 to 730 nm were developed. Using these metal selenides as H₂-evolving photocatalysts, CoO_x/BiVO₄ as the O₂-evolving photocatalyst, and reduced graphene oxide as the electron mediator, all-solid-state Z-scheme overall pure water splitting systems were constructed. The rate of photocatalytic H₂ evolution from aqueous solutions containing Na₂S and Na₂SO₃ as the electron donors was evaluated while employing these selenide photocatalysts at various Zn/(Zn+Cu) and Ga/Cu molar ratios. The data demonstrate that efficient Z-scheme overall water splitting was significantly correlated to the photoelectrochemical performance of the selenide photocatalysts acting as photocathodes, rather than the photocatalytic activities of these materials during the sacrificial H₂ evolution.
- Hydrogen production,
- Photocatalysis,
- Selenide,
- Water splitting,
- Z-scheme
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