A Mass Transfer-Enhanced Pyrolysis-Free Bifunctional Catalyst to Boost Ultralong Lifespan Zinc-Air Batteries

The development of efficient and low-cost bifunctional oxygen catalysts is essential yet a challenge for zinc-air batteries(ZABs).Here,we prepared a pyrolysis-free 3-dimensional hybrid catalyst(COP-Fe@3DLDH)with bifunctional oxygen-catalytic activity by integrating layered double hydroxides(3D-LDH)and a fully conjugated iron phthalocyanine-based covalent organic polymer(COP-Fe).More hierarchically porous and larger specific surface area(170.4 m^(2) g^(−1))can effectively enhance the mass transfer process and active site exposure of cathode,allowing COP-Fe@3D-LDH to exhibit an outstanding peak power density(148.5 mW cm^(-2))and an ultralong lifespan(over 400 h at 10 mA cm^(-2))in ZABs.Accordingly,this work provides a new perspective to enhance the performance of pyrolysis-free catalysts in ZABs.