High-Efficiency Two-Dimensional Catalysts Derived from Co _x Zn _y -ZIF-L MOFs for Solid-State Na-Air Battery

High-efficiency two-dimensional catalystsCo(0.6)@N-C provides abundant three-phase interfaces,which effectivelyimproves the performance of solid-state Na-air batteries. Rechargeable solid-state sodium-air batterieshave beenconsidered as next-generation high-energy-density electrochemicalstorage devices. However, the limited triple-phase boundaries andslow kinetics between the cathode and electrolyte seriously affectthe rate performance and the cycle life of the battery. The cathode/catalystmaterial of the battery is the facility for oxygen reduction and evolutionreactions, which determine the capacity and rechargeability of thesemetal-air batteries. Herein, we designed a novel two-dimensionalporous high-efficiency catalyst (Co-0.6@N-C) withhigh catalytic activity obtained from a cobalt/zinc bimetallic zeolite-likeimidazole skeleton structure (Co0.6Zn0.4-ZIF-L)material. The two-dimensional Co-0.6@N-C catalystnot only provides more active sites/channels for oxygen adsorptionand desorption but also exhibits continuous faster electron transferat the interface of electrolyte and catalyst; this ingenious arrangementendows the solid-state Na-air battery with a superior capabilityof 11 150 mAh g(-1) and cycling stability inair.