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In situ growth of cobalt@cobalt-borate core–shell nanosheets as highly-efficient electrocatalysts for oxygen evolution reaction in alkaline/neutral medium

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Abstract

Development of efficient non-noble metal electrocatalysts for oxygen evolution reaction (OER) is still a crucial issue for renewable energy technologies. Herein, we report a core–shell-like catalyst of amorphous cobalt borate nanosheets grown on metallic cobalt deposited on Ti-mesh (Co@Co–Bi/Ti) by an in situ conversion strategy. Benefiting from the high activity, large surface area of Co–Bi nanosheets, outstanding electronic conductivity of metallic Co and the 3D structure inherited from Ti-mesh substrate, Co@Co–Bi/Ti shows high OER activity with a relatively small overpotential of 329 mV to obtain a current density of 10 mA cm−2, a low Tafel slope of 46 mV dec−1 and an accessible large current density of 500 mA cm−2 in alkaline solution. Besides, Co@Co–Bi/Ti exhibits good performance in a near-neutral medium. This study provides an effective pathway to improve the cobalt metal based materials.

Graphical abstract: In situ growth of cobalt@cobalt-borate core–shell nanosheets as highly-efficient electrocatalysts for oxygen evolution reaction in alkaline/neutral medium

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Publication details

The article was received on 15 Aug 2017, accepted on 27 Sep 2017 and first published on 28 Sep 2017


Article type: Paper
DOI: 10.1039/C7NR06054H
Citation: Nanoscale, 2017, Advance Article
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    In situ growth of cobalt@cobalt-borate core–shell nanosheets as highly-efficient electrocatalysts for oxygen evolution reaction in alkaline/neutral medium

    C. Xie, Y. Wang, D. Yan, L. Tao and S. Wang, Nanoscale, 2017, Advance Article , DOI: 10.1039/C7NR06054H

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