The OER electrocatalytic performance of the cubic CoNiCuFe-PBA and amorphous CoNiCuFe-Oxide catalysts was conducted to examine the specific catalytic activity in alkaline electrolytes. We directly use CoNiCuFe-PBA powder with 5%Nafion-isopropyl alcohol solutions as ink for the OER test. The cyclic voltammetry (CV) curves of CoNiCuFe-PBA and CoNiCuFe-Oxide were obtained in the purified 1 M KOH (purification details in Experimental section and corresponding CV in Figure ) at a scan rate of 10 mV s -1 , as shown in Figure .