Figure 6.

a) Schematic illustration of water splitting powered by electronic energy, where alkaline electrolyzer is constructed with Co/CoMoN/NF both as cathode and anode. b) Representative polarization curves for overall water splitting in cells of Co/CoMoN/NF||Co/CoMoN/NF and Pt/C/NF||RuO₂/NF, within 1.0 m KOH electrolyte, sweep rate: 10 mV s⁻¹. c) Electrochemical stability test of Co/CoMoN/NF||Co/CoMoN/NF cell at 100 mA cm⁻² for 140 h. d) Comparison of working voltage of Co/CoMoN/NF‐based electrolyzer at the current density of 100 mA cm⁻² with the values of ones reported previously.