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Issue 6, 2018
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In situ grown Co3O4/Co(OH)2 hybrids as efficient electrocatalysts for water oxidation

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Abstract

Transition-metal oxides have been considered as water oxidation catalyst (WOC) alternatives to precious metal-based catalysts, but they generally display inferior electrocatalytic efficiency. A novel heterogeneous Co3O4/Co(OH)2 hybrid is synthesized through a simple facile one-pot hydrothermal reaction. The as-obtained hierarchical Co3O4/Co(OH)2 hybrids can serve as highly efficient electrocatalytic water oxidation catalysts for alkaline electrolytes. The prepared hierarchical Co3O4/Co(OH)2 hybrids show strong interaction effects, facilitating the increase of the number of active sites and facile charge transfer ability. Remarkably, hierarchical Co3O4/Co(OH)2 hybrids afforded electrocatalytic water oxidation activity, it requires a low potential of 1.60 V to obtain a current density of 10 mA cm−2 and a small Tafel slope of approximately 103 mV dec−1. A preliminary electrocatalytic water oxidation reaction mechanism catalyzed by a cobalt-based catalyst is proposed according to the reported publications and experimental data. The final step for oxygen evolution is the rate-determining step, which is supported by electrochemical experiments. This study indicates that the hierarchical Co3O4/Co(OH)2 hybrids are promising as efficient electrocatalysts for water oxidation that can be used in water splitting for hydrogen production and generation of hydrocarbon fuels and fuel cells.

Graphical abstract: In situ grown Co3O4/Co(OH)2 hybrids as efficient electrocatalysts for water oxidation

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Publication details

The article was received on 27 Dec 2017, accepted on 30 Jan 2018 and first published on 31 Jan 2018


Article type: Paper
DOI: 10.1039/C7NJ05146H
Citation: New J. Chem., 2018,42, 4215-4222
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    In situ grown Co3O4/Co(OH)2 hybrids as efficient electrocatalysts for water oxidation

    X. Du, H. Pan and Z. Yang, New J. Chem., 2018, 42, 4215
    DOI: 10.1039/C7NJ05146H

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