Intense nano-interfacial interactivity stimulates the OER in a MOF-derived superhydrophilic CuO–NiO heterostructure

The CuO–NiO/NF catalyst shows an overpotential of 231 mV in driving a current density of 10 mA cm −2 and exhibits a Tafel slope value of 100 mV dec −1 . The catalyst shows 20 h of stability for oxygen evolution without significant change in the activity.