Metal selenide photocatalysts for visible-light-driven Z -scheme pure water splitting

Particulate metal selenides having narrow bandgaps for photocatalytic overall pure water splitting have not yet been reported due to the severe self-photooxidation of such materials. The present work demonstrates that solid solutions of zinc selenide and copper gallium selenide (ZnSe:CGSe), with abs...

Full description

Saved in:
Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2019, Vol.7 (13), p.7415-7422
Main Authors: Chen, Shanshan, Ma, Guijun, Wang, Qian, Sun, Song, Hisatomi, Takashi, Higashi, Tomohiro, Wang, Zheng, Nakabayashi, Mamiko, Shibata, Naoya, Pan, Zhenhua, Hayashi, Toshio, Minegishi, Tsutomu, Takata, Tsuyoshi, Domen, Kazunari
Format: Article
Language:English
Subjects:
Chemical evolution
Cobalt oxides
Fuel production
Gallium
Gallium selenides
Gold
Metals
Oxidation
P-type semiconductors
Particulates
Photocatalysis
Photocatalysts
Photooxidation
Selenide
Selenides
Solid solutions
Splitting
Water splitting
Zinc
Zinc selenide
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Particulate metal selenides having narrow bandgaps for photocatalytic overall pure water splitting have not yet been reported due to the severe self-photooxidation of such materials. The present work demonstrates that solid solutions of zinc selenide and copper gallium selenide (ZnSe:CGSe), with absorption edges ranging from 480 to 750 nm, can be employed as H 2 evolution photocatalysts in particulate photocatalyst sheets for Z -scheme pure water splitting, where CoO x /BiVO 4 and Au are used as the oxygen evolution photocatalyst and electron mediator, respectively. Photogenerated holes in the metal selenide are efficiently recombined with electrons from BiVO 4 via the Au layer, thus avoiding self-oxidation of the selenides and leading to stable pure water splitting. Varying the ZnSe:CGSe composition demonstrates that both the p-type semiconductor character and excellent photoelectrochemical properties of selenides are vital to efficient Z -scheme water splitting. This study extends the application field of metal selenides in photocatalytic pure water splitting and creates new opportunities for selenide-based photocatalytic systems for solar fuel production.
ISSN:2050-7488
2050-7496
DOI:10.1039/C9TA00768G