▎ 摘　　要

An efficient synthetic strategy have been developed, which is based on the simple substitution reaction between PdCl42- and Co. Under the action of surfactant PVP, the hollow structure of Pd catalyst was prepared successfully. Subsequently, graphene was used as the support. After loading the Pd-NS on the surface of graphene, the Pd-NS/GN catalyst was prepared. For the electrooxidation of formic acid, Pd-NS/GN catalyst showed a larger electrochemical specific surface area, good electrical catalytic performance and high stability.