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Three electron channels toward two types of active sites in MoS2@Pt nanosheets for hydrogen evolution

Abstract

Molybdenum disulfide (MoS2) has emerged as a promising electrocatalyst for hydrogen evolution reaction (HER), but its activity generally suffers from the limited edge active sites and stagnant conductivity. Here we report a controllable Pt decoration strategy on MoS2 nanosheet arrays (NSAs) anchored on three-dimensional (3D) conductive carbon fiber cloth (CFC) substrate to boost the electrocatalytic HER activity into an upper level comparable to commercial Pt foil catalyst in acidic media, with low overpotential of -70 mV and Tafel slope of 36 mV per decade as well as large exchange current density of 0.43 mA cm-2. The results show that the laden Pt makes the inert basal surface of MoS2 an attractive platform steering three electron channels toward two types of active sites, that is, electron transfer from CFC to MoS2 edge sites and surface Pt sites, as well as photo-excited electron injection from MoS2 domains to adjacent Pt sites, to promise the excellent HER performance. This study presents a feasible avenue to inject the HER activity for MoS2 through surface decoration activating inert basal surface and provides deep insights for designing MoS2-based HER catalysts.

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Publication details

The article was received on 16 Aug 2017, accepted on 03 Oct 2017 and first published on 04 Oct 2017


Article type: Paper
DOI: 10.1039/C7TA07241D
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Three electron channels toward two types of active sites in MoS2@Pt nanosheets for hydrogen evolution

    X. Xu, X. Dong, Z. Bao, R. Wang, J. Hu and H. Zeng, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA07241D

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