Research On Functionalized Catalyst Of The Proton Exchange Membrane Fuel Cell

With the development of PEMFC,the process of PEMFC in the commercial era is also accelerating.As one of the key points of FC,catalysts are faced with the issue of how to improve performance and lifetime.The "water logging" problem of the MEA is also one of the problems that leads to the attenuation of the catalyst life.In order to improve the durability of catalysts.This article will study the preparation of hydrophobic catalysts and PtNWs catalysts.The first part is through the oxidation treatment of the carrier and reduction treatment of catalyst,and the durability change was verified by CV test,and the change of hydrophobicity was verified by the contact angle measurement.The experimental results and analysis show that the oxidative pretreatment of the carrier can improve the Pt carrying ability and durability of the carrier.At the same time,the reductive treatment can remove the oxygen-containing functional groups on the catalyst surface and improves the hydrophobicity.After two thousand cycles of the CV tests it's durability was better than commercial catalysts.The other part is the PtNWS catalyst prepared by the template method.Firstly,the PtNWS were prepared by the soft template method.Through the transmission electron microscope,we can clearly see that the PtNWS with good growth and uniform length were obtained through the soft template method.Secondly,using the simpler templateless method,we chose carbon nanotubes as catalyst carriers to prepare nanowire catalysts.Compared with commercial catalysts,the electrochemical activity area and durability of nanowire catalysts are higher than commercial catalysts through CV,and they have better activity and lifetime.At the same time,due to the special structure of the nanowire catalyst,the ORR performance of the nanowire catalyst is better.Tests show that the hydrogen hydroxide is more easily desorbed from the PtNWS,and the half-wave potential of the LSV curve is shifted positively,indicating that the nano wire catalyst exhibits a better ORR performance.The linear structure of PtNWS is not easy to dissolve and loss caused by the loss of Pt particles,and the linear structure is more conducive to the transfer of matter and electrons at the reaction interface,so it can exhibit better performance and lifetime.