Gram Scale Preparation And Process Optimization Of Low Platinum Alloy Catalysts For The Fuel Cell

Energy depletion and environmental pollution are emerging as a result of the transition use and exploitation of fossil fuels.With the rapid development of new energy,a lot of technology has made breakthrough progress.Proton exchange membrane fuel cell(PEMFC)is expected to break through barriers and achieve market-oriented.At present,one of the most important factors that hinder the marketing process of PEMFC is its cost.Noble metal platinum(Pt)is one of the most effective components in the cathode catalyst for PEMFC.Therefore,how to reduce the amount of platinum in the catalyst and prolong the service life of platinum based catalyst is a hot research topic all over the world.In this paper,the cathode catalysts of platinum based alloy for fuel cell was studied.The microstructure,composition,surface element composition and catalytic activity of the catalysts were analyzed by TEM,TG&DTG,FT-IR,XRD,EDS,ICP,XPS,CV and LSV.More details are as follows:1.By using microwave assisted reduction method and controlling the stirring time,pH,temperature and other conditions,Pt-Co alloy catalyst with high utilization ratio,uniform dispersion and excellent catalytic performance was prepared.We investigated and optimized the gram scale preparation process route of alloy catalysts.The homogeneity of different batch preparation was compared,and the process route of preparing Pt-Co alloy catalyst with uniform size,small particle size and uniform catalytic performance was explored.2.Gas/liquid alloy removal methods on catalysts were used to remove non platinum metal on the surface.The optimization of structure can reduce the loss of the metal ions in the acidic electrolyte solution and the damage of the membrane material,improving the stability of the catalyst and prolonging the overall life of the battery.In addition,the carrier optimization of the catalyst was carried out by the use of polymer poly aniline coated carbon.We studied the performance of the catalyst prepared by the polyaniline coated carbon material as the carrier and the catalytic activity of nitrogen doped catalyst by calcination.3.The effects of alloy,polyaniline coating carrier and nitrogen doping on the catalyst were studied by means of microscopic characterization and performance test.The structure-activity relationship between the microstructure and the macroscopic properties of the catalyst was investigated,which provided a theoretical basis for the optimization of the structure and the optimization of the catalyst.