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Co–P/graphene alloy catalysts doped with Cu and Ni for efficient photocatalytic hydrogen generation

Abstract

Developing low-cost and high-efficiency photocatalysts for hydrogen production from solar water splitting is an intriguing and challenging objective. The Co–P-based ternary alloy Co-M-P (M: Cu, Ni) cocatalysts decorated on graphene (GP) were prepared by doping Cu and Ni via an in situ synthesis strategy, and the photocatalytic performances for H2 generation were systematically studied under visible light irradiation. The structure, morphology, chemical composition, and surface electronic state of catalysts were studied by X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) techniques. The results indicated that Co-Cu-P and Co-Ni-P alloys were active co-catalysts for photocatalytic H2 evolution under visible light irradiation, and the partially oxidized Co species played an important role in enhancing efficient H2 generation evidenced by XPS and XRD characterizations. For the catalyst Co–Cu–P/GP (15%) and Co–Ni–P/GP (15%) catalysts, the H2 generation rates reached 44.5 and 36.1 mmol h-1 gCo-1, and the coresponding apparent quantum efficiency (AQE) values reached 23.6 and 14.8% at 430 nm, respectively. Multi-cycle experiments indicated that both Co–Cu–P/GP (15%) and Co–Ni–P/GP (15%) catalysts presented a good stability in photocatalytic H2 evolution reaction. The Co-Ni-P and Co-Cu-P alloy materials are promising catalysts for the photocatalytic H2 evolution.

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Publication details

The article was received on 16 May 2017, accepted on 02 Oct 2017 and first published on 03 Oct 2017


Article type: Paper
DOI: 10.1039/C7NJ01598D
Citation: New J. Chem., 2017, Accepted Manuscript
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    Co–P/graphene alloy catalysts doped with Cu and Ni for efficient photocatalytic hydrogen generation

    W. Zhen, Y. Guo, Y. Wu and G. Lu, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ01598D

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