Constructing of homojunction of sulfides would be an effective method to improve photocatalytic hydrogen evolution activity. However, only pure hexagonal phase Mn_0.25Cd_0.75S was synthesized so far. Herein, a series of cubic/hexagonal Mn_0.25Cd_0.75S (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 Mn_0.25Cd_0.75S 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

中文翻译：

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LaCoO3装饰的立方/六边形Mn0.25Cd0.75S在可见光下显着增强光催化氢的释放

硫化物同质结的构建将是提高光催化制氢活性的有效方法。然而，到目前为止，仅合成了纯的六方相Mn _0.25 Cd _0.75S。在此，通过控制硫代乙酰胺的量，水热合成了一系列立方/六方Mn _0.25 Cd _0.75 S（CH-MCS）光催化剂。当Mn∶Cd∶S的摩尔比等于1∶3∶6时，CH-MCS表现出5.85mmol g ^-1  h ^-1的最大H ₂产生速率。此外，用10 wt％LaCoO ₃改性的优化的CH-MCS达到最大的H ₂释放速率，达到14.5 mmol g ^-1 h ^-1，是纯六角形Mn _0.25 Cd _0.75 S的5.5倍，是优化的CH-MCS的2.5倍，这可归因于立方/六方晶相同质结和装饰引起的可见光吸收的增强的LaCoO ₃。

图形概要