Fig. 2

Electrochemical characterizations for OER. a Linear sweep voltammetry (LSV) curves of NiFeCP/NF, NiFe LDH/NF, RuO₂/NF, and Ni foam. b NiFeCP/NF, NiFe LDH/NF, RuO₂/NF, and Ni foam. c Current densities at an overpotential, η = 250 mV, as a function of electrode type. d The η required for j = 10 mA cm⁻² as a function of electrode type. e Chronopotentiometric measurements of OER in 1.0 M KOH as a function of current density. f Extended chronopotentiometric measurements at j = 10 mA cm⁻² and j = 50 mA cm⁻² for 17 h