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Phase-controllable synthesis of cobalt hydroxide for electrocatalytic oxygen evolution

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Abstract

Identification of active sites for oxygen evolution reaction (OER) plays a key role in the design and fabrication of high-performance cobalt-based electrocatalysts. Herein, we report the synthesis of two types of two-dimensional monometallic cobalt hydroxide nanoplates in aqueous solution for OER: α-Co(OH)2 with both Co2+Td and Co2+Oh sites and β-Co(OH)2 with Co2+Oh sites. Electrochemical characterization reveals that α-Co(OH)2 is more active than β-Co(OH)2 towards OER. The better activity can be attributed to the presence of Co2+Td sites in α-Co(OH)2, which are more active than Co2+Oh sites. Our finding clarifies the contribution of the two catalytic sites and helps future rational design of high-performance OER electrocatalysts.

Graphical abstract: Phase-controllable synthesis of cobalt hydroxide for electrocatalytic oxygen evolution

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Publication details

The article was received on 28 Mar 2017, accepted on 05 May 2017 and first published on 05 May 2017


Article type: Communication
DOI: 10.1039/C7DT01110E
Citation: Dalton Trans., 2017, Advance Article
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    Phase-controllable synthesis of cobalt hydroxide for electrocatalytic oxygen evolution

    F. Lyu, Y. Bai, Q. Wang, L. Wang, X. Zhang and Y. Yin, Dalton Trans., 2017, Advance Article , DOI: 10.1039/C7DT01110E

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