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Converting solar energy into sustainable hydrogen fuel by photoelectrochemical (PEC) water splitting is a promising technology to solve increasingly serious global energy supply and environmental issues. However, the PEC performance based on TiO 2  nanomaterials is hindered by the limited sunlight-harvesting ability and its high recombination rate of photogenerated charge carriers. In this work, layered SnS 2  absorbers and CoO x  nanoparticles decorated two-dimensional (2D) TiO 2  nanosheet array photoelectrode have been rationally designed and successfully synthesized, which remarkably enhanced the PEC performance for water splitting. As the result, photoconversion efficiency of TiO 2 /SnS 2 /CoO x  and TiO 2 /SnS 2  hybrid photoanodes increases by 3.6 and 2.0 times under simulated sunlight illumination, compared with the bare TiO 2  nanosheet arrays photoanode. Furthermore, the TiO 2 /SnS 2 /CoO x  photoanode also presented higher PEC stability owing to CoO x  catalyst served as efficient water oxidation catalyst as well as an effective protectant for preventing absorber photocorrosion.

TiO2 Nanosheet Arrays with Layered SnS2 and CoOx Nanoparticles for Efficient Photoelectrochemical Water Splitting