Fig. 4: Electrocatalytic OER performance of bimetallic nanosheets.

a OER polarization curves, b Tafel plots of Co-Ru-S-Se, Co-Ni-S-Se, Co-Cd-S-Se, Co-Au-S-Se, RuO2, and Co-S-Se. c Cdl values of current density differences plotted against scan rates of Co-Ru-S-Se, Co-Ni-S-Se, Co-Cd-S-Se, Co-Au-S-Se, RuO2 and bare Co-S-Se. d EIS Nyquist plots of Co-Ru-S-Se, Co-Ni-S-Se, Co-Cd-S-Se, Co-Au-S-Se, RuO2, and bare Co-S-Se. e Everlasting stability for the Co-S-Se at current densities of 10 mA cm−2 for 36 h, inset in (e) continuous CV scanning after 2000 circles at 100 mV s−1. f TOF curves of Co-Ni-S-Se, Co-Cd-S-Se, Co-Au-S-Se, and Co-Ru-S-Se at the overpotential of 311 mV.