Research On Non-Pt Cathode Catalyst For Polymer Electrolyte Fuel Cell

Fuel cell has been a kind of clean energy with high energy density.In the whole fuel cell system,metal catalysts usually account for the largest part of the total cost.As common catalysts for oxygen reduction reactions,metal platinum-based catalysts have the disadvantages of high production cost and poor durability.Therefore,using cheaper non noble metal catalysts to replace the traditional noble metal catalysts is of great significance to realize the commercial application of redox catalysts.Carbon materials derived from metal organic framework materials also have its own unique advantages,such as large specific surface area,adjustable pore structure and other advantages.Therefore,this paper mainly starts with the development of non-noble metal catalysts to replace platinum base,and designs two new cobalt-nitrogen-carbon material catalysts with different structures.The research contents and conclusions are as follows:（1）ZIF-67-x C₃H₆N₆precursor with different nitrogen content was successfully synthesized by impregnation method with added melamine.CoNC-0.5C₃H₆N₆-700 catalyst prepared from nitrogen-doped porous carbon with adjustable morphology and pore structure prepared by pyrolysis has the highest oxygen reduction catalytic activity under alkaline conditions,which may be because more Co content can expose more active sites,and the formation of micropore-mesoporous pore structure is also conducive to material transfer.（2）Hollow Zn₃[Co（CN）₆]₂-n PVP precursor was prepared by Co-precipitation with additional PVP.The morphology and pore structure of porous carbon nanospheres doped with Zinc-Cobalt-Nitrogen were adjustable by pyrolysis.In the pyrolysis process,Zn evaporation and PVP decomposition produced abundant micropores and mesoporous.The bimetal Co Zn@NG-4PVP-900 has high N content,high specific surface area and special shell structure,so it has good electrocatalytic activity in alkaline media.