High cycle stability of Li-O 2 batteries enabled by RuO 2 loaded Metal- organic framework-derived Co-based catalysts

Li-O2 batteries have attracted more and more attention as the high theoretical specific capacity, but the practical application is restricted by factors such as excessively high overpotential, poor rate and cycle performance. It is urgent to find high-efficiency catalysts to improve ORR and OER reaction kinetics and provide enough space to store undecomposed Li2O2. In this report, we use a simple hydrothermal synthesis method to compound RuO2 particles on the surface of Co3O4 with the ZIF-8@ZIF-67 double MOF structure as a template. The Co3O4/RuO2 material shows perfect ORR and OER bifunctional catalytic performance with better onset potential and hale-wave potential, almost as good as commercial Pt/C. Meanwhile, the Li-O2 battery shows high specific capacity of 11304 mA h g-1, excellent rate performance and perfect cycle stability, which can stable cycle 387th, while Co3O4 only cycle 16th.