The exploration of high-performance and earth-abundant water oxidation catalysts operating under mild conditions is highly attractive and challenging. In this communication, core-shell CoFeO@Co-Fe-Bi nanoarray on carbon cloth (CoFeO@Co-Fe-Bi/CC) was successfully fabricated by in situ surface amorphization of CoFeO nanoarray on CC (CoFeO/CC). As a 3D water oxidation electrode, CoFeO@Co-Fe-Bi/CC shows outstanding activity with an overpotential of 460 mV to drive a geometrical catalytic current density of 10 mA cm 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 O is the rate-limiting step and the high water oxidation activity of CoFeO@Co-Fe-Bi/CC is associated with the lower free energy of 1.84 eV on a Co-Fe-Bi shell.
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