High-Efficiency Two-Dimensional Catalysts Derived from CoxZny-ZIF-L MOFs for Solid-State Na–Air Battery

Rechargeable solid-state sodium–air batteries have been considered as next-generation high-energy-density electrochemical storage devices. However, the limited triple-phase boundaries and slow kinetics between the cathode and electrolyte seriously affect the rate performance and the cycle life of the battery. The cathode/catalyst material of the battery is the facility for oxygen reduction and evolution reactions, which determine the capacity and rechargeability of these metal–air batteries. Herein, we designed a novel two-dimensional porous high-efficiency catalyst (Co0.6@N–C) with high catalytic activity obtained from a cobalt/zinc bimetallic zeolite-like imidazole skeleton structure (Co0.6Zn0.4-ZIF-L) material. The two-dimensional Co0.6@N–C catalyst not only provides more active sites/channels for oxygen adsorption and desorption but also exhibits continuous faster electron transfer at the interface of electrolyte and catalyst; this ingenious arrangement endows the solid-state Na–air battery with a superior capability of 11 150 mAh g–1 and cycling stability in air.