Cobalt-Borate Nanoarray: An Efficient and Durable Electrocatalyst for Water Oxidation under Benign Conditions

The development of efficient earth-abundant electrocatalysts for oxygen evolution reaction (OER) under benign conditions is still urgent and challenging. Herein, we report the electrochemical generation of novel Co–Bi nanoarray on carbon cloth (Co–Bi NA/CC) from CoS2 nanoarray precursor. As a three-dimensional anode, such Co–Bi NA/CC exhibits excellent electrocatalytic performance for OER with the overpotential requirement of 411 mV to drive 10 mA cm–2. Notably, this electrode also demonstrates outstanding long-term electrochemical durability for 20 h.