Hydrogen generation by photocatalytic reforming of glucose with heterostructured CdS/MoS2 composites under visible light irradiation |
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| Affiliation: | 1. Department of Physics and Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, Wuhan University, Wuhan 430072, Hubei Province, China;2. College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, Zhejiang Province, China;3. State Grid Zhejiang Electric Power Research Institute, Hangzhou 310007, Zhejiang Province, China;1. Department of Industrial Engineering, University of Salerno, via Giovanni Paolo II, 132, 84084 Fisciano (SA), Italy;2. Department of Civil Engineering, University of Salerno, Italy;3. Grupo de Catálisis, Escuela de Ciencias Químicas, Universidad Pedagógica y Tecnológica de Colombia, Avenida Central del Norte, Tunja, Boyacá, Colombia;4. Instituto de Ciencia de Materiales de Sevilla (ICMS), Consejo Superior de Investigaciones Científicas (CSIC), Universidad de Sevilla, Américo Vespucio 49, 41092 Sevilla, Spain;5. Department of Pharmacy, University of Salerno, via Giovanni Paolo II, 132, 84084 Fisciano (SA), Italy;1. Department of Industrial Engineering, University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, SA, Italy;2. Department of Civil Engineering, University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, SA, Italy |
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| Abstract: | A binary heterostructured CdS/MoS2 flowerlike composite photocatalysts was synthesized via a simple one-pot hydrothermal method. This photocatalyst demonstrated higher photocatalytic hydrogen production activity than pure MoS2. The heterojunction formed between MoS2 and CdS seems to promote interfacial charge transfer (IFCT), suppress the recombination of photogenerated electron–hole pairs, and enhance the hydrogen generation. Based on the good match between the conduction band (CB) edge of CdS and that of MoS2, electrons in the CB of CdS can be transferred to MoS2 easily through the heterojunction between them, which prevents the accumulation of electrons in the CB of CdS, inhibiting photocorrosion itself and greatly enhancing stability of catalyst. Hydrogen evolution reaction (HER) using Na2S/Na2SO3 or glucose as sacrificial agents in aqueous solution was investigated. The ratio between CdS and MoS2 plays an important role in the photocatalytic hydrogen generation. When the ratio between CdS and MoS2 reaches 40 wt%, the photocatalyst showed a superior H2 evolution rate of 55.0 mmol g−1 h−1 with glucose as sacrificial agent under visible light, which is 1.2 times higher than using Na2S/Na2SO3 as sacrificial agent. Our experimental results demonstrate that MoS2-based binary heterostructured composites are promising for photocorrosion inhibition and highly efficient H2 generation. |
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| Keywords: | Visible-light photocatalysis HER Glucose |
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