Highly active deficient ternary sulfide photoanode for photoelectrochemical water splitting

Haimei Wang, Yuguo Xia, Haiping Li, Xiang Wang, Yuan Yu, Xiuling Jiao & Dairong Chen

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Received Date: 7th January 20

The exploration of photoanode materials with high efficiency and stability is the eternal pursuit for the realization of practically solar-driven photoelectrochemical water splitting. Here we develop a novel deficient ternary metal sulfide (CdIn2S4) as photoanode, and its PEC performance is significantly enhanced by introducing surface S vacancies, achieving a photocurrent density of 5.73 mA cm-2 at 1.23 V vs. RHE and 1 Sun and an applied bias photon-to-current efficiency of 2.49% at 0.477 V vs. RHE, which, to the best of our knowledge, are the record-high values for a single sulfide photon absorber to date. The experimental characterizations and theoretical calculations highlight the enhanced effect of surface S vacancies on the interfacial charge separation and transfer kinetics and also demonstrate the restrained surface states distribution and the transformation of active sites after introducing surface S vacancies. This work may inspire more excellent work on developing sulfide-based photoanodes.

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This is an abstract of a preprint hosted on an independent third party site. It has not been peer reviewed but is currently under consideration at Nature Communications.

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