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Selective phosphidation: an effective strategy toward CoP/CeO2 interface engineering for superior alkaline hydrogen evolution electrocatalysis

Abstract

Co phosphides, although highly active for the hydrogen evolution electrocatalysis in acids, still deliver inferior performance in alkalis, limiting their application in alkaline water electrolysis. Building effective Co phosphides/(hydroxide)oxide interface could be a viable way to improve the hydrogen evolution activity of Co phosphide catalyst under alkaline conditions, which however remains unexplored and challenging. In this communication, we report the facile development of CoP-CeO2 hybrid nanosheets film on Ti mesh (CoP-CeO2/Ti) from easily-made Co3O4-CeO2 via a selective phosphidation strategy. In 1.0 M KOH, such CoP-CeO2/Ti achieves a geometrical catalytic current density of 10 mA cm-2 at a pretty low overpotential of 43 mV, 27 mV less than that for CoP/Ti. Remarkably, our CoP-CeO2/Ti also shows superior durability over CoP/Ti, suggesting CeO2 greatly stabilizes the CoP catalyst. Density functional theory calculations demonstratre that CoP-CeO2 possesses a lower water dissociation free energy and a more optimal hydrogen adsorption free energy than CoP. This selective phosphidation strategy is universal to engineer transition metal phoshide/oxide interface for applications.

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Publication details

The article was received on 21 Nov 2017, accepted on 04 Jan 2018 and first published on 04 Jan 2018


Article type: Communication
DOI: 10.1039/C7TA10237B
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Selective phosphidation: an effective strategy toward CoP/CeO2 interface engineering for superior alkaline hydrogen evolution electrocatalysis

    R. Zhang, X. Ren, S. Hao, R. Ge, Z. Liu, A. M. Asiri, L. Chen, Q. Zhang and X. Sun, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C7TA10237B

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