LAUSR

Ordered mesoporous Cu/Ni/Co oxides are prepared via nanocasting with varied Cu/Ni ratio to establish its impact on the electrochemical performance of the catalysts. Physico-chemical properties are determined along with the electrocatalytic activities toward oxygen evolution/reduction reactions (OER/ORR). Combining Cu, Ni, and Co allows creating active and stable bifunctional electrocatalysts. CuNiCo oxide (Cu/Ni≈1/4) exhibits the highest current density of 411 mA cm-2 at 1.7 V vs RHE and requires the lowest overpotential of 312 mV to reach 10 mA cm-2 in 1M KOH after 200 CVs. OER measurements are also conducted in the purified 1M KOH, where CuNiCo oxide (Cu/Ni≈1/4) also outperforms NiCo oxide and shows excellent chemical and catalytic stability. For ORR, Cu/Ni incorporation provides higher current density, better kinetics, and facilitates 4e- pathway of the oxygen reduction reaction. The tests in Li-O 2 cells highlight that Cu/Ni/Co oxide can effectively promote ORR and OER at a lower overpotential.