Noble-metal-free MnS/In2S3 composite as highly efficient visible light driven photocatalyst for H-2 production from H2S

摘要

Large amounts of sulfide or sulfite have been extracted from fossil energy resources, which call for green strategies to utilize them. In this study, hydrogen production and H2S removal,are simultaneously achieved over MnS/In2S3 composite photocatalysts. Highly active MnS/In2S3 composite photocatalysts were synthesized via a solvothermal route. The photocatalytic activities depend on their compositions. A maximum H-2 production rate of 8360 mu mol g(-1) h(-1) can be achieved over a MnS/In2S3 with optimized composition, which is approximately 2090 times higher than that of pristine alpha-MnS and 50 times higher than that of beta-In2S3 alone. The corresponding quantum efficiency of this sample is as high as 34.2% at 450nm even in the absence of any noble-metal co-catalysts. Importantly, MnS/In2S3 composite displays a good stability and anti-photocorrosion, which provides a strategy for scaling up the H-2 production from byproducts at petrochemical plants for energy applications. (C) 2017 Elsevier B.V. All rights reserved.