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

Abstract

Transition-metal oxides have attracted extensive interest as water oxidation catalyst (WOC) alternatives to noble metal-based catalysts, but they generally exhibit limited electrocatalytic activity. A novel heterogeneous Co3O4/Co(OH)2 hybrid is prepared by a controllable facile one-pot hydrothermal reaction. The as-obtained hierarchical Co3O4/Co(OH)2 hybrids can serve as highly efficient electrocatalytic water oxidation catalysts in alkaline electrolytes. The prepared hierarchical Co3O4/Co(OH)2 hybrids show strong synergetic coupling effects, facilitating active site exposure and facile charge transfer. Remarkably, hierarchical Co3O4/Co(OH)2 hybrids afforded electrocatalytic water oxidation activity with a current density of 10 mA cm-2 at a low potential of 1.60 V 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 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, generation of hydrocarbon fuels and fuel cells.

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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, Accepted Manuscript
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    In situ grown Co3O4/Co(OH)2 hybrids as efficient electrocatalysts for water oxidation

    X. Q. Du, H. Pan and Y. Zhi, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C7NJ05146H

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