▎ 摘　　要

The composites WO3-GO were prepared by the modification of WO3 crystal particles onto the surface of graphene oxide(GO), Pd/WO3-RGO catalysts were prepared by using potassium borohydride as the reducing agent. The performances of the catalysts and the effect of different contents of WO3 on the catalytic activity were investigated. The Pd/WO3-RGO catalysts showed significantly enhanced electrocatalytic performances for formic acid oxidation. The peak current density on the best catalyst Pd/20% WO3-RGO cata. lyst was 2.5 times that on Pd/RGO catalyst. And more importantly, Pd/WO3-RGO catalysts showed improved stability and excellent tolerance to CO poisoning. According to XRD, TEM and HRTEM results, Pd/WO3- RGO catalysts are made of monoclinic WO3, face centered cubic palladium crystal particles and graphene. WO3 particles are most likely to be covered or overlapped with Pd particles and Pd nanoparticles have a uni- form distribution. The enhanced catalytic activity of Pd/WO3-RGO can be ascribed to the interaction between Pd and WO3.