Selenium-doped copper oxide nanoarrays: Robust electrocatalyst for the oxygen evolution reaction with ultralow overpotential

The oxygen evolution reaction (OER) is the key anodic in electrochemical water splitting. OER a four-electron process with sluggish kinetics. RuO2 and IrO2 are benchmark catalysts for OER. Thus, finding low-cost, earth-abundant, stable electrocatalyst big challenge. In this work, we report over Se-CuO/CF nanoarrays an ultralow overpotential of 440 mV (at 50 mA/cm2 current density). nanoarray has TOF 0.05 s−1 at 300 mV. catalyst showed consistent performance upto1000 cycles run period 10 h. was compared RuO2/CF only lower than density. state art density 100 mA/cm2. Tafel slope 21 mV/decade to suggesting faster kinetics Se-CuO/CF. surface area conductivity were increased upon doping Se into CuO/CF which can be attributed enhanced nanoarrays.