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Surface Reconstruction of Cobalt Phosphide Nanosheets by Electrochemical Activation for Enhanced Hydrogen Evolution in Alkaline Solution

Abstract

Transition metal phosphides exhibit promising catalytic performance for hydrogen evolution reaction (HER), however their surface structure evolution during the electrochemical operation is still rare to study. In this work, we investigate the surface reconstruction of CoP nanosheets by an in-situ electrochemical activation method. After remodeling, CoP nanosheets experience an irreversible and significant evolution on the morphology and composition, and low-valence Co complexes consisting of Co(OH)x species are formed on the surface of CoP nanosheets, which largely accelerate the dissociation of water. Benefit to the synergistic effect of CoP and Co(OH)x, the working electrode shows a remarkably enhanced HER activity of 100 mV at 10 mA cm-2 with a Tafel slope of 76 mV dec-1, which is better than most of transition metal phosphides catalysts. This work would provide a deep understanding of surface reconstruction and novel perspective to rational design for high performance transition metal phosphides electrocatalysts towards water related electrolysis.

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Publication details

The article was received on 15 Oct 2018, accepted on 06 Dec 2018 and first published on 06 Dec 2018


Article type: Edge Article
DOI: 10.1039/C8SC04589E
Citation: Chem. Sci., 2019, Accepted Manuscript
  • Open access: Creative Commons BY license
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    Surface Reconstruction of Cobalt Phosphide Nanosheets by Electrochemical Activation for Enhanced Hydrogen Evolution in Alkaline Solution

    B. Y. Xia, L. Su, X. Cui, T. He, L. Zeng, T. Han, Y. Song and K. Qi, Chem. Sci., 2019, Accepted Manuscript , DOI: 10.1039/C8SC04589E

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