Visible‐Light‐Driven Photocatalytic Z‐Scheme Overall Water Splitting in La5Ti2AgS5O7‐based Powder‐Suspension System. Issue 9 (28th January 2019)

• Record Type: Journal Article
• Authors: Song, Zhimin; Hisatomi, Takashi; Chen, Shanshan; Wang, Qian; Ma, Guijun; Li, Shikuo; Zhu, Xiaodi; Sun, Song; Domen, Kazunari
• Is Part Of: ChemSusChem. Volume 12:Issue 9(2019)
• Page Start: 1906
• Page End: 1910
• Publication Date: 2019-01-28
• Subjects: oxysulfides -- photocatalysis -- visible light -- water splitting -- Z-scheme; Green chemistry -- Periodicals; Sustainable engineering -- Periodicals; Chemistry -- Periodicals; Chemical engineering -- Periodicals; 660
• DOI: 10.1002/cssc.201802306
• Languages: English
• ISSNs: 1864-5631

Abstract

Abstract: La5 Ti2 Cu x Ag1− x S5 O7 ( 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 La5 Ti2 Cu x Ag1− x S5 O7 materials, La5 Ti2 AgS5 O7 was found to have the highest performance on Z‐scheme overall water splitting in conjunction with PtO x ‐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 La5 Ti2 AgS5 O7 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 La5 Ti2 AgS5 O7 ‐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. Abstract : Lighting up the water : Visible light‐driven Z‐scheme water splitting with Pt/NiS‐loaded LTA as hydrogen evolution photocatalyst, PtO x ‐WO3 as oxygen evolution photocatalyst, and I3 − /I − as redox mediator, achieves an apparent quantum yield of 0.12 % at 420 nm. The optimization strategy for Z‐scheme water splitting in a powder‐suspension system differs from that for particulate photocatalyst sheets or a photoelectrochemical system.