Direct methanol fuel cells(DMFCs)are one of the potential power sources for portable electronic devices,which,however,were limited by the high cost-performance ratio of the Pt-based electrocatalysts in the methanol oxidation reaction[1].Pd is a suitable low-cost non-platinum metal with high catalytic activity towards methanol oxidation in alkaline media[2].Thus,the recent work focused on improving catalytic activity and stability of Pd-based catalysts.It was reported that nitrogen-doped carbon materials could be employed as high effective supports[3].In this work,Polybenzimidazoles(PBI)was chose as the nitrogen source to modify CNTs by using the π-π interactions between them,which determines the perfect coating of PBI materials on the surface of CNTs.The high temperature post-treatment was then applied to generate the N-containing carbon coated CNTs(CNx@ CNT).It was found that the N sites on CNTs surface could,on the one hand,anchor the Pd nanoparticles on supports and enhance the dispersion of nanoparticles on supports,on the other hand,enhance the catalytic activity of Pd nanoaprticles by modifying the Pd electronic structure and the bifunctional effect on catalytic systems.More importantly,the durability of CNx@ CNT supported Pd catalysts was found to improve greatly,compared with bare CNTs supported Pd catalyst.