L-cysteine capped CoNiSx combined with Mn-Cd-S solid solution form S-scheme heterojunction for efficient and stable H2-releasing photocatalysis

With the reduction of traditional energy sources, photocatalytic hydrogen production technology provides a practical way to solve the energy crisis. The construction of photocatalysts with high performance and excellent stability is the core of water splitting for hydrogen production. Here, L-cysteine capped CoNiSx (L-CNSx) nanoplates are used to generate Mn-Cd-S solid solution (MCS) nanomaterials in situ for the construction of efficient and robust L-CNSx/MCS S-scheme heterojunction for photocatalytic hydrogen evolution reaction (HER). As a result, the optimized L-CNSx/MCS-2 heterojunction exhibited an enhanced HER rate of 91.2 mmol & BULL;g � 1 & BULL;h-1, which was 4.8 times of the pure MCS and 690.9 times of pure CNSx. This work not only suppressed the photocorrosion of MCS nanomaterials, but also greatly improved the charge transfer efficiency by generating a strong internal electric field. This study highlights the role of CNSx in photocatalytic HER, which provides a new method to inhibit the photocorrosion of MCS-based composites.