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A NiCo 2 O 4 @Ni-Co-Ci core-shell nanowire array as an efficient electrocatalyst for water oxidation at near-neutral pH.

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 NiCo2 O4 nanowire array supported on carbon cloth (NiCo2 O4 /CC) via electrochemical surface derivation of NiCo2 O4 . The resulting NiCo2 O4 @Ni-Co-Ci core-shell nanowire array on carbon cloth (NiCo2 O4 @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 . NiCo2 O4 @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.

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