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

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 an effective Co phosphide/(hydroxide)oxide interface could be a viable way to improve the hyd...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2018, Vol.6 (5), p.1985-1990
Main Authors: Zhang, Rong, Ren, Xiang, Shuai Hao, Ge, Ruixiang, Liu, Zhiang, Asiri, Abdullah M, Chen, Liang, Zhang, Qiuju, Sun, Xuping
Format: Article
Language:English
Subjects:
Alkalies
Alkaline water
Alkalis
Catalysis
Catalysts
Cerium oxides
Cobalt oxides
Density functional theory
Durability
Electrocatalysis
Electrolysis
Energy of dissociation
Engineering
Evolution
Free energy
Hydrogen
Hydrogen evolution
Hydrogen-based energy
Phosphides
Strategy
Titanium
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Summary: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 an effective Co phosphide/(hydroxide)oxide interface could be a viable way to improve the hydrogen evolution activity of Co phosphide catalysts under alkaline conditions, which however remains unexplored and challenging. In this communication, we report the facile development of a CoP–CeO2 hybrid nanosheet film on Ti mesh (CoP–CeO2/Ti) from easily made Co3O4–CeO2via 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 that CeO2 greatly stabilizes the CoP catalyst. Density functional theory calculations demonstrate 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 in engineering the transition metal phosphide/oxide interface for applications.
ISSN:2050-7488
2050-7496
DOI:10.1039/c7ta10237b