Hydrogen generation by photocatalytic reforming of glucose with heterostructured CdS/MoS2 composites under visible light irradiation. (6th July 2017)

• Record Type: Journal Article
• Authors: Li, Chunhe; Wang, Hongmei; Ming, Julan; Liu, Min; Fang, Pengfei
• Is Part Of: International journal of hydrogen energy. Volume 42:Number 27(2017)
• Page Start: 16968
• Page End: 16978
• Publication Date: 2017-07-06
• Subjects: Flowerlike CdS/MoS2 composite -- Visible-light photocatalysis -- HER -- Glucose; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2017.05.137
• Languages: English
• ISSNs: 0360-3199

Abstract

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 Na2 S/Na2 SO3 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 Na2 S/Na2 SO3 as sacrificial agent. Our experimental results demonstrate that MoS2 -based binary heterostructured composites are promising for photocorrosion inhibition and highly efficient H2 generation. Graphical abstract: Highlights: CdS/MoS2 flowerlike binary heterojunction is fabricated without any stabilizer. CdS/MoS2 leads to obvious increase of the visible light absorption. Glucose is used as hole scavenger to enhance HER under visible light irradiation.