Growing interest in fuel cells has enhanced efforts to lower the Pt loading and improve the electrocatalytic performance of supported Pt electrode for the oxygen reduction reaction (ORR),the cathodic reaction in almost all fuel cells.Recently,carbon nanofiber (CNF) as catalyst support has generated intense interest due to its special physicochemical characteristics—tunable and controllable textures and microstructures,which make it possible to modify the properties of CNF and adjust the deposition of and interaction with the supported metal nanoparticles.The present work deals with the electrophoretic deposition of Pt on glassy carbon (GC) and on CNF.The as-prepared Pt/GC and Pt/CNF/GC catalysts were characterized by TEM technique.The electrocatalytic performances of the catalysts for ORR were evaluated by cyclic voltammetry,liner sweep voltammetry,ac impedance and RDE techniques.The TEM results showed the deposited Pt particle sizes were in nanometer scale.Cyclic voltammetry and liner sweep voltammetry studies showed that the performance of the Pt/CNF/GC was significantly higher compared to Pt/GC,and the ac impedance showed that during the electrochemical reaction process the charge transfer resistance decreased obviously with the increase of the content of CNF,RDE analysis showed that ORR on Pt/CNF/GC was a directly 4-e pathway,indicating CNF a promising electrocatalyst support.