Release Time:2019-03-11  Hits:

Indexed by: Journal Papers

Date of Publication: 2018-01-26

Journal: NATURE COMMUNICATIONS

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

Volume: 9

Issue: 1

ISSN: 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.