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The mechanism change by switching the reactants from water to hydroxyl ion for electrocatalytic water oxidation: A case study of copper oxide microspheres

Abstract

Developing noble metal-free water oxidation catalysts is essential for many energy conversion/storage processes (e.g., water splitting). Herein, we report a facile synthesis of CuO microspheres composed of ultrathin, single-crystal-like nanosheets via a simple solution method.The as-obtained CuO microspheres can serve as an active and stable water oxidation catalyst under electrochemical reaction condition,owing to their unique structural features. In the electrochemical water oxidation, this catalyst affords acurrent density of 10 mA cm-2 (a value related to practical relevance) at overpotential of ~0.48 V. Pure CuO was reported as a water oxidation catalyst(WOC) from near-neutral condition to alkalescent condition. Electrochemistry values agree with the Nernstian behavior, suggesting ne−/nH+transfer prior to a chemicalrate-determining step. Our results suggest that delicate nanostructure can offer unique advantages for developing efficient water oxidation catalysts.

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Publication details

The article was received on 06 Apr 2017, accepted on 09 May 2017 and first published on 12 May 2017


Article type: Paper
DOI: 10.1039/C7DT01230F
Citation: Dalton Trans., 2017, Accepted Manuscript
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    The mechanism change by switching the reactants from water to hydroxyl ion for electrocatalytic water oxidation: A case study of copper oxide microspheres

    X. Q. Du, J. Huang and Y. Ding, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT01230F

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