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Core-shell CoFe2O4@Co-Fe-Bi nanoarray: a surface-amorphization water oxidation catalyst operating at near-neutral pH

Abstract

The exploration for high-performance and earth-abundant water oxidation catalysts operating under mild conditions is highly attractive and challenging. In this communication, core-shell CoFe2O4@Co-Fe-Bi nanoarray on carbon cloth (CoFe2O4@Co-Fe-Bi/CC) was successfully fabricated by in situ surface amorphization of CoFe2O4 nanoarray on CC (CoFe2O4/CC). As a 3D water oxidation electrode, CoFe2O4@Co-Fe-Bi/CC shows outstanding activity with overpotential of 460 mV to drive a geometrical catalytic current density of 10 mA cm-2 in 0.1 M potassium borate (pH 9.2). Notably, it also demonstrates superior long-term durability for at least 20 h with 96% Faradic efficiency. Density functional theory calculations indicate that the conversion from OOH* to O2 is the rate-limiting step and the high water oxidation activity for CoFe2O4@Co-Fe-Bi/CC is associated with the lower free energy of 1.84 eV on Co-Fe-Bi shell.

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Publication details

The article was accepted on 06 May 2017 and first published on 12 May 2017


Article type: Communication
DOI: 10.1039/C7NR02929B
Citation: Nanoscale, 2017, Accepted Manuscript
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    Core-shell CoFe2O4@Co-Fe-Bi nanoarray: a surface-amorphization water oxidation catalyst operating at near-neutral pH

    X. Ji, S. Hao, F. Qu, J. Liu, G. Du, A. M. Asiri, L. Chen and X. Sun, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR02929B

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