Advanced Extremely Durable 3D Bifunctional Air Electrodes for Rechargeable Zinc‐Air Batteries

A very practical, 3D air electrode architecture based on a bifunctional cobalt oxide nanowire array that is active towards both the oxygen reduction and oxygen evolution reactions is introduced. This advanced carbon- and binder-free electrode exhibits remarkable electrochemical durability, with 600 h of operation under ambient conditions in a rechargeable zinc-air battery.