Enhanced oxygen evolution performance by the partial phase transformation of cobalt/nickel carbonate hydroxide nanosheet arrays in an Fe-containing alkaline electrolyte

Co 1 Ni 6 CH exhibits a good OER activity (η 50 = 256 mV, 51 mV/dec) and stability in 1 M KOH with partial phase transformation. Fe impurity in electrolyte can provide more active sites, improve electronic conductivity, and promote stability.