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Remarkable enhancement of the alkaline oxygen evolution reaction activity of NiCo2O4 by an amorphous borate shell

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Abstract

It is highly desirable but still a challenging task to find a simple, fast and straightforward method to greatly improve the alkaline oxygen evolution reaction (OER) performance of a NiCo2O4 catalyst. In this communication, we demonstrate that developing an amorphous borate shell on a NiCo2O4 surface can boost its OER activity in alkaline media. As a 3D catalyst electrode, a NiCo2O4@Ni–Co–B nanoarray on carbon cloth needs an overpotential of only 270 mV to achieve a geometrical catalytic current density of 10 mA cm−2 in 1.0 M KOH, which is 100 mV less than that for a NiCo2O4 nanoarray. Notably, this electrode also demonstrates strong electrochemical durability, maintaining its activity for at least 100 h. The superior activity of NiCo2O4@Ni–Co–B is attributed to the amorphous Ni–Co–B shell on NiCo2O4 favoring the in situ electrochemical generation of more active species during water oxidation.

Graphical abstract: Remarkable enhancement of the alkaline oxygen evolution reaction activity of NiCo2O4 by an amorphous borate shell

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Publication details

The article was received on 15 Jun 2017, accepted on 25 Jul 2017 and first published on 25 Jul 2017


Article type: Research Article
DOI: 10.1039/C7QI00340D
Citation: Inorg. Chem. Front., 2017, Advance Article
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    Remarkable enhancement of the alkaline oxygen evolution reaction activity of NiCo2O4 by an amorphous borate shell

    X. Ji, X. Ren, S. Hao, F. Xie, F. Qu, G. Du, A. M. Asiri and X. Sun, Inorg. Chem. Front., 2017, Advance Article , DOI: 10.1039/C7QI00340D

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