Abstract
We report on the development of secondary metals doped Co5.47N nanosheets [donated as CoM(3:1)-N (M = Fe, Ni, Mn, and Zn; 3:1 is the molar ratio of Co to M)] as nonprecious metal OER catalysts. Electrochemical test results show that the Fe-doped CoFe(3:1)-N possesses superior OER activity (only need an overpotential of 200 mV to drive 10 mA cm–2) and long-term durability in 1.0 M KOH which outperform those of RuO2. X-ray photoelectron spectroscopy characterization results reveal that the Fe doping into crystal texture has led to the largest positive shift (∼1.2 eV) in binding energy of Co 2p compared to Ni, Mn, and Zn; the Lewis acid effect of Fe3+ can boost the formation of more Co4+ OER active sites. Our finding discloses the enhancing mechanism of OER on second metals-doped bimetallic nitrides and meanwhile affords a new concept toward exploring and designing high-efficiency non-noble metal OER electrocatalysts.
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