A composite of Co-Mo2C nanoparticles supported by nitrogen-doped graphene for stable Li–CO2 batteries

Abstract

Li–CO2 batteries are considered promising energy storage systems due to their high energy density and CO2 fixation capability. However, the slow kinetics of the redox reaction leads to high charging overpotential, low energy efficiency, and poor reversibility. Herein, a nitrogen-doped graphene supported Co-Mo2C nanoparticles composite was synthesized and introduced as cathode catalysts for Li–CO2 batteries. The bimetallic catalyst design of Co and Mo2C provides efficient catalytic activity during discharge and charge process, separately. The assembled battery delivered a high discharge capacity and a long cycle stability with a relatively low overpotential.