Highly Active Deficient Ternary Sulfide Photoanode for Photoelectrochemical Water Splitting

Yuguo Xia National Engineering Research Center for Colloidal Materials, Shandong University


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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Supplementary material

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