In Situ Incorporation Strategy for Bimetallic FeCo-Doped Carbon as Highly Efficient Bifunctional Oxygen Electrocatalysts

Highly efficient bifunctional oxygen reduction reaction/oxygen evolution reaction (ORR/OER) electrocatalysts are of great significance for developing rechargeable metal-air batteries. A facile insitu incorporation strategy was proposed to introduce an iron-based complex into a cobalt-based ZIF-67 framework. The resultant FeCo-N/C exhibited an excellent ORR activity with a high half-wave potential of 0.84V and simultaneous outstanding OER activity with a low overpotential of 370 mV at a current density of 10 mAcm(-2) in 0.1M KOH. The overall oxygen electrode activity was calculated to be as low as 0.77V. This work provides new opportunities for the development of highly efficient bifunctional electrocatalysts.