La 5 Ti 2 Cu x Ag 1− x S 5 O 7 ( 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 La 5 Ti 2 Cu x Ag 1− x S 5 O 7 materials, La 5 Ti 2 AgS 5 O 7 was found to have the highest performance on Z‐scheme overall water splitting in conjunction with PtO x ‐WO 3 as an OEP and a triiodide/iodide (I 3 − /I − ) redox couple as a shuttle electron mediator in a powder‐suspension system. Loading Pt/NiS on La 5 Ti 2 AgS 5 O 7 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 La 5 Ti 2 AgS 5 O 7 ‐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.
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Song et al. (2019) studied this question.
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