Visible-Light-Driven Photocatalytic Z-Scheme Overall Water Splitting in La5Ti2AgS5O7-based Powder-Suspension System

Impact Factor:

8.928

DOI number:

10.1002/cssc.201802306

Journal:

ChemSusChem

Key Words:

Lighting up the water

Abstract:

La5Ti2CuxAg1−xS5O7 (x=0–1) is a type of long-wavelength-responsive oxysulfide photocatalysts for hydrogen evolution and has been demonstrated to enable the Z-scheme water-splitting coupling with oxygen evolution photocatalysts (OEPs) in the particulate sheet. Among La5Ti2CuxAg1−xS5O7 materials, La5Ti2AgS5O7 was found to have the highest performance on Z-scheme overall water splitting in conjunction with PtOx-WO3 as an OEP and a triiodide/iodide (I3−/I−) redox couple as a shuttle electron mediator in a powder-suspension system. Loading Pt/NiS on La5Ti2AgS5O7 benefitted the Z-scheme to achieve an apparent quantum yield of 0.12 % at 420 nm. The results for this powder-suspension system differ from earlier studies on photocatalyst sheet configurations, in which p-type doping and the formation of a solid solution could effectively enhance the water-splitting activity. This work not only demonstrates a La5Ti2AgS5O7-based Z-scheme water-splitting photocatalyst but also improves the understanding of the difference between particulate sheets and a powder-suspension system available in an optimal strategy for water splitting.

Co-author:

Takashi Hisatomi, Shanshan Chen, Qian Wang, Guijun Ma, Shikuo Li,Xiaodi Zhu

First Author:

Zhimin Song

Correspondence Author:

Song Sun, Kazunari Domen

Volume:

12

Issue:

9

Page Number:

1906-1910

ISSN No.:

1864-5431

Translation or Not:

no

Date of Publication:

2019-05-08

Links to published journals:

https://chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/cssc.201802306