Dendritic core-shell nickel-iron-copper metal/metal oxide electrode for efficient electrocatalytic water oxidation

Peili Zhang, Lin Li, Dennis Nordlund, Hong Chen, Lizhou Fan, Biaobiao Zhang, Xia Sheng, Quentin Daniel and Licheng Sun ()
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Peili Zhang: KTH Royal Institute of Technology
Lin Li: Stanford University
Dennis Nordlund: SLAC National Accelerator Laboratory
Hong Chen: KTH Royal Institute of Technology
Lizhou Fan: KTH Royal Institute of Technology
Biaobiao Zhang: KTH Royal Institute of Technology
Xia Sheng: KTH Royal Institute of Technology
Quentin Daniel: KTH Royal Institute of Technology
Licheng Sun: KTH Royal Institute of Technology

Nature Communications, 2018, vol. 9, issue 1, 1-10

Abstract: Abstract Electrochemical water splitting requires efficient water oxidation catalysts to accelerate the sluggish kinetics of water oxidation reaction. Here, we report a promisingly dendritic core-shell nickel-iron-copper metal/metal oxide electrode, prepared via dealloying with an electrodeposited nickel-iron-copper alloy as a precursor, as the catalyst for water oxidation. The as-prepared core-shell nickel-iron-copper electrode is characterized with porous oxide shells and metallic cores. This tri-metal-based core-shell nickel-iron-copper electrode exhibits a remarkable activity toward water oxidation in alkaline medium with an overpotential of only 180 mV at a current density of 10 mA cm−2. The core-shell NiFeCu electrode exhibits pH-dependent oxygen evolution reaction activity on the reversible hydrogen electrode scale, suggesting that non-concerted proton-electron transfers participate in catalyzing the oxygen evolution reaction. To the best of our knowledge, the as-fabricated core-shell nickel-iron-copper is one of the most promising oxygen evolution catalysts.

Date: 2018
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DOI: 10.1038/s41467-017-02429-9

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