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(a) LSV curves of Ni@NC, Fe(1%)-Ni@NC, Fe(2.5%)-Ni@NC, Fe(5%)-Ni@NC, Fe(10%)-Ni@NC, and RuO2 in 1.0 M KOH at 5 mV s–1. (b) Tafel plots of different catalysts. (c) Comparison of the overpotential at 10 mA·cm–2 between Fe(5%)-Ni@NC and some recently reported similar electrocatalysts. (d) Nyquist plots for Ni@NC and Fe(5%)-Ni@NC.
