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Indexed by:期刊论文

Date of Publication:2018-01-26

Journal:NATURE COMMUNICATIONS

Included Journals:SCIE、ESI高被引论文、Scopus

Volume:9

Issue:1

ISSN No.:2041-1723

Key Words:copper; iron; metal oxide; nickel; oxygen; water, alloy; catalyst; chemical reaction; efficiency measurement; electrochemical method; electrode; hydrogen; oxidation; oxide; reaction kinetics, Article; catalysis; catalyst; current density; cyclic potentiometry; electrochemistry; oxidation; oxygen evolution; precursor; scanning electron microscopy; surface area; synthesis; transmission electron microscopy; X ray absorption spectroscopy; X ray photoelectron spectroscopy

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.