CoC₂O₄·2H₂O derived Co₃O₄ nanorods array: a high-efficiency 1D electrocatalyst for alkaline oxygen evolution reaction

Self-standing Co3O4 nanorods array on Co foil as a 1D OER catalyst electrode, only needs overpotential of 308 mV to drive 15 mA cm−2 in 1.0 M KOH, with good long-term electrochemical durability and a high turnover frequency.