Pt Nanoparticles Supports On One-dimensional Doping And Three-dimensional Titanium Nitride As Catalyst For Methanol Oxidation

Direct methanol fuel cells have the advantages of environmental friendliness and high energy conversion rate,and are one of the clean energy sources with great application prospects.Currently,platinum carbon?Pt/C?are the commercial catalysts for direct methanol fuel cells.The Pt/C catalyst has good catalytic performance,but the binding ability between the Pt and the C carrier is poor,and the corrosion of the C carrier also causes agglomeration of Pt naonparticles,thereby degrading the activity of the catalysts,which led to a decay in the battery life.Therefore,the research and development of a new type of Pt catalyst carrier is particularly important for the further commercial development of direct methanol fuel cells.In this paper,one-dimensional?1D?titanium cobalt nitride nanotubes(Ti_0.95Co_0.05N NTs),titanium chromium nitride nanotubes(Ti_0.95Cr_0.05N NTs)and three-dimensional titanium nitride?3D TiN?were prepared by simple solvothermal and post-nitridation methods,and then Pt load on these supports.Furthermore,the methanol electrocatalytic performance of the synthesized catalysts were investigated by a series of characterization tests and electrochemical performance tests on those supports and catalysts.The Pt/Ti_0.95Co_0.05N NTs catalyst possesses good electrochemical stability,and the tubular structure of the support facilitates the dispersion of the catalyst.The tubular structure of Ti_0.95Co_0.05N NTs can be seen by SEM and TEM characterization.The XPS analysis show that the incorporation of Co element allows the TiCoN to transfer electrons to the Pt catalyst,which increast the Pt?0?content in the catalyst and enhances the interaction between Pt and TiCoN,indicating that Pt/Ti_0.95Co_0.05N NTs show good electrochemical performance and stability.Furthermore,compared to Pt/C and Pt/TiN NTsT catalysts,Pt/Ti_0.95Co_0.05N NTs show better methanol oxidation activity,anti-poisoning ability and stability by the electrochemical tests of those catalysts.The Pt/Ti_0.95Cr_0.05N NTs catalyst has good electrochemical stability and the carrier of the tubular structure is advantageous for the dispersion of the catalyst.The tubular structure of Ti_0.95Cr_0.05N NTs can be seen by SEM and TEM characterization.The XPS results indicate that the incorporation of Cr element causes the interaction between electrons between carrier TiCrN and Pt,which makes the catalyst Pt/Ti_0.95Cr_0.05N NTs have better catalytic and stability.The electrochemical testing of 3D TiN shows good electorchemical stability.Furthermore,the catalysts of Pt/Ti_0.95Cr_0.05N NTs show good methanol oxidation activity,anti-poisoning ability and stability by the electrochemically testing compared with Pt/C and Pt/TiN NTs catalysts.The Pt/3D TiN catalyst has good electrochemical stability,and the three-dimensional structure of TiN provides more active sites for the catalyst,which is beneficial to the dispersion of the catalyst.The three-dimensional structure composed of nanofibers can be seen by SEM and TEM characterization.The methanol electrocatalytic of Pt/3D TiN shows that it has good methanol oxidation activity and stability compared with Pt/C catalysts.The accelerated durability tests show that the electrochemical specific surface area of the Pt/3D TiN decreased by 19%after 1800 cycles,which was better than the commercial Pt/C reduction of 43%.The XPS results further indicate that there is a strong interaction between the catalyst Pt and 3D TiN,so that Pt/3D TiN have better electrochemical activity and stability.