Preparation And Performance Study Of PT-based Catalyst Support For Anode Of Direct Methanol Fuel Cell

Direct methanol fuel cells(DMFC)have the advantages of low operating temperature,clean and pollution-free,and high energy density.They are considered to be the most likely commercialized batteries and are expected to be used in clean energy vehicles and portable power supplies.At present,the main problem affecting the commercialization of direct methanol fuel cells is the high price of platinum-based catalysts and the permeability of proton exchange membranes.This paper focuses on the low electrocatalytic performance and poor stability of anode methanol oxidation in direct methanol fuel cells.The issue is being studied.It mainly includes the following aspects:In this paper,ultrafine platinum nanowires(Pt NWNs)were synthesized by solvothermal method,and graphite carbon nanotubes(g-C3N4)were prepared by high temperature calcination of urea.Pt NWNs/C3N4 catalysts were synthesized and the reaction was studied.The effect of time on Pt NWNs,the effect of different calcination atmospheres and different precursors on g-C3N4 support.The results show that g-C3N4 support has the best performance obtained by the calcination of urea under nitrogen which is recorded as Pt NWNs/C3N4-N2.The electrochemical active area of the Pt NWNs/C3N4-N2 catalyst is 90 m2 g-1,and the Pt/XC-72 is 46.3 m2 g-1.In addition,the peak current density of Pt NWNs/C3N4-N2 catalyst is 1.54 times that of Pt/XC-72 after 1000 cycles of aging test.Pt NWNs/C3N4-N2 only attenuated by 25%and the Pt/XC-72 catalyst attenuates by 45%,it shows that Pt NWNs/C3N4-N2 catalyst exhibits excellent electrochemical stability and stronger resistance to CO poisoning.Nitrogen-doped TiO2 CNTs and CeO2 CNTs supports were successfully prepared by calcining the mixture of oxides and melamine at high temperature.Pt was loaded by ethylene glycol microwave.The results showed that the catalytic activity of 10%Pt/TiO2 CNTs and 10%Pt/CeO2 CNTs low Pt catalysts for methanol oxidation was 5.2 and 4.2 times higher than that of commercial 20%Pt/C catalysts,respectively,and the electrochemical activity area was 5 times of 20%Pt/C catalysts,and 3.6 times.The increase of the activity is due to the doping of nitrogen,which enhances the interaction between Pt particles and support,and the interaction between rich oxygen-containing functional groups on the surface of TiO2 and CeO2 and Pt reduces the adsorption capacity of CO,the by-product of the reaction,thus improving the catalytic activity and stability of Pt.