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Issue 20, 2017
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Enhanced visible-light-driven hydrogen generation by in situ formed photocatalyst RGO–CdS–NixS from metal salts and RGO–CdS composites

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Abstract

Artificial photosynthesis for H2 production is regarded as a promising strategy to deal with the future energy crisis and environmental problems. To design highly efficient and low-cost photocatalysts is highly desired. Herein, we develop a novel photocatalyst (RGO)n–CdS–NixS (n = 0–7) in situ made simply from the NiCl2 precursor and (RGO)n–CdS composites at room temperature with enhanced visible-light-driven H2 evolution activity. (RGO)2–CdS–NixS shows the highest activity for H2 production in ethanol aqueous solution with a rate up to 17.5 μmol h−1 mg−1, which is about 36 times higher than that of bare CdS, 23.4 times higher than that in the absence of Ni2+ ((RGO)2–CdS), and 2.43 times higher than that in the absence of the graphene scaffold under the same conditions. UV-vis DRS, emission spectra, BET analysis and electrocatalytic activity as well as elemental mapping images suggest that the Ni2+ salt is well fabricated on (RGO)2–CdS for enhanced photocatalytic performance. Accordingly, other metal-based photocatalysts (RGO)2–CdS–M (M = Co2+, Fe2+ or Mn2+) also exhibit high H2 evolution activity. This study highlights a simple in situ deposition method to fabricate low-cost and highly active photocatalysts for H2 production.

Graphical abstract: Enhanced visible-light-driven hydrogen generation by in situ formed photocatalyst RGO–CdS–NixS from metal salts and RGO–CdS composites

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Supplementary files

Article information


Submitted
11 Jan 2017
Accepted
10 Mar 2017
First published
10 Mar 2017

J. Mater. Chem. A, 2017,5, 9537-9543
Article type
Paper

Enhanced visible-light-driven hydrogen generation by in situ formed photocatalyst RGO–CdS–NixS from metal salts and RGO–CdS composites

J. Wang, J. Wang, K. Feng, H. Zhang, Z. Li, B. Liu, C. Tung and L. Wu, J. Mater. Chem. A, 2017, 5, 9537
DOI: 10.1039/C7TA00336F

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