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Significantly Enhanced Photocatalytic Hydrogen Evolution Under Visible Light Over LaCoO3-Decorated Cubic/Hexagonal Mn0.25Cd0.75S
Catalysis Letters ( IF 2.3 ) Pub Date : 2021-05-25 , DOI: 10.1007/s10562-021-03660-2
Peisong Yang , Yepeng Yang , Liang Jiang , Jiao He , Daomei Chen , Yongjuan Chen , Jiaqiang Wang

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



中文翻译:

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

更新日期:2021-05-25
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