Reconstruction and Performances of High‐Entropy Alloy in ZIF‐Derived Carbon Skeleton with Bifunctional Oxygen Electrocatalysis

The bifunctional electrocatalysis of oxygen reduction reaction/oxygen evolution reaction (ORR/OER) with high activity and high stability requires multiple adsorption/reaction sites. Here, high‐entropy alloy (HEA) nanoparticles embedded with relatively rich elements in a nitrogen‐doped carbon skeleton as a bifunctional ORR/OER catalyst are proposed. More specifically, the nonmetal‐derived carbon skeleton obtained by carbonizing ZIF‐8 at high temperature is impregnated in different metal salt solutions, and then the FeCoNiCuMn HEA‐embedded nitrogen‐doped carbon electrocatalyst (FeCoNiCuMn/NC) is prepared by secondary pyrolysis. Due to the synergic effect between FeCoNiCuMn HEAs nanoparticles and nitrogen‐doped carbon skeleton, the electrocatalyst with abundant and accessible active sites can provide great charge/mass transfer and thus shows high ORR and OER bifunctional electrocatalytic activation. The bifunctional electrocatalytic ORR/OER performance of FeCoNiCuMn/NC catalyst is further optimized by adjusting Mn content. In ORR tests, FeCoNiCuMn 1.0 /NC catalyst displays the largest half‐wave potential (E 1/2 , 0.898 V), maximum limiting density of current ( J L , 5.22 mA cm −2 ), and best stability. As for OER, FeCoNiCuMn 1.0 /NC possesses a lower overpotential ( η ) of 300 mV at a current density of 10 mA cm −2 and more durable stability than commercial RuO 2 (324 mV).