Enhanced redox cycling of FeyO by Cr-doping over oxygen electrode for rechargeable zinc–air batteries

The carbon-based bimetallic oxide catalyst (Cr_xO-Fe_yO/NC) synthesized by calcination method achieves excellent oxygen electrocatalytic activity through the electronic effect of the Cr-Fe interface, with an ORR half-wave potential of 0.89 V and a low overpotential of 351 mV at 50 mA cm^-2 under OER.