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A NiCo2O4@Ni–Co–Ci core–shell nanowire array as an efficient electrocatalyst for water oxidation at near-neutral pH

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Abstract

It is attractive but still remains challenging to develop efficient water oxidation electrocatalysts working in a carbonate (Ci) electrolyte. In this communication, we report that a Ni–Co–Ci layer can be developed on a NiCo2O4 nanowire array supported on carbon cloth (NiCo2O4/CC) via electrochemical surface derivation of NiCo2O4. The resulting NiCo2O4@Ni–Co–Ci core–shell nanowire array on carbon cloth (NiCo2O4@Ni–Co–Ci/CC) exhibits high activity toward water oxidation in 1.0 M KHCO3 (K–Ci, pH = 8.3) with the overpotential requirement of 309 mV to drive 10 mA cm−2. NiCo2O4@Ni–Co–Ci/CC also shows long-term electrochemical stability for 20 h and a high turnover frequency of 0.464 mol O2 s−1 at an overpotential of 600 mV.

Graphical abstract: A NiCo2O4@Ni–Co–Ci core–shell nanowire array as an efficient electrocatalyst for water oxidation at near-neutral pH

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Publication details

The article was received on 24 Apr 2017, accepted on 24 May 2017 and first published on 24 May 2017


Article type: Communication
DOI: 10.1039/C7CC03146G
Citation: Chem. Commun., 2017, Advance Article
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    A NiCo2O4@Ni–Co–Ci core–shell nanowire array as an efficient electrocatalyst for water oxidation at near-neutral pH

    R. Ge, M. Ma, X. Ren, F. Qu, Z. Liu, G. Du, A. M. Asiri, L. Chen, B. Zheng and X. Sun, Chem. Commun., 2017, Advance Article , DOI: 10.1039/C7CC03146G

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