Abstract Constructing of homojunction of sulfides would be an effective method to improve photocatalytic hydrogen evolution activity. However, only pure hexagonal phase Mn0.25Cd0.75S was synthesized so far. Herein, a series of cubic/hexagonal Mn0.25Cd0.75S (CH-MCS) photocatalysts were hydrothermally synthesized by controlling the amount of thioacetamide. When the molar ratio of Mn:Cd:S equals to 1:3:6, the CH-MCS exhibited the maximum H2 production rate of 5.85?mmol?g?1?h?1. Moreover, the optimized CH-MCS modified with 10 wt LaCoO3 reached the maximal rate of H2 evolution to 14.5 mmol?g?1?h?1, that is 5.5 folds to pure hexagonal Mn0.25Cd0.75S and 2.5 folds to the optimized CH-MCS, which can be attributed to the cubic/hexagonal crystal phase homojunctions and the enhancement of visible-light absorptions caused by the decoration of LaCoO3.Graphical Abstract
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