Abstract
Non-noble metal cocatalyst has showed good potential for improving photocatalytic hydrogen evolution reaction (HER). In this study, the non-precious metal cobalt sulfide (CoS) cocatalyst was deposited onto the CdS surface to construct heterojunctions using a solvothermal method. The fabricated structures were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV–visible diffuse-reflectance spectroscopy (UV–vis DRS), photoluminescence (PL), time-resolved PL spectra (TRPL) and photoelectrochemical measurements (PEC). The heterojunctions were evaluated as photocatalysts using the hydrogen evolution reaction with lactic acid as a sacrificial agent. The optimized 60 %-CoS/CdS sample shows a photocatalytic H2 production rate of 3193.7 μmol·h−1·g−1 under visible light (λ ≥ 400 nm), which is 32 times higher than that of pure CdS. The improved performance is attributed to a great improvement in separation efficiency of the photogenerated electron-hole pairs.
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