High-Efficiency Two-Dimensional Catalysts Derived from Co<sub><i>x</i></sub>Zn<sub><i>y</i></sub>-ZIF-L MOFs for Solid-State Na–Air Battery
Qi Sun, Guohua Zhu, Lei Dai, Wei Meng, Ling Wang, Shan Liu
Abstract
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 (Co 0.6 @N–C) with high catalytic activity obtained from a cobalt/zinc bimetallic zeolite-like imidazole skeleton structure (Co 0.6 Zn 0.4 -ZIF-L) material. The two-dimensional Co 0.6 @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.