Construction Of Bimetallic Phosphide/C Platinum-based Catalyst Composite Support And Its Methanol Oxidation Enhancement Characteristics

Energy is always the material guarantee for human social production activities.With the advancement of industrial development and the improvement of the demands for people’s living needs,the fossil energy currently stored is far from meeting the needs of social development,and it also poses great challenges to the ecological environment on which humans depend.Direct methanol fuel cells（DMFCs）have attracted great attention from domestic and foreign researchers due to their rich fuel sources,simple system structure,low operating temperature and high energy density.At present,the electrocatalyst used in the anode of DMFCs mainly employs Pt as a catalytically active component,which has high costs,low catalytic activity and active site poisoning by CO poisoning,and which has largely blocked the commercialization of DMFCs.Therefore,how to adjust the catalyst components,structural morphology,and construct excellent catalyst supports to improve the utilization of Pt components and improve catalyst CO poisoning is still a hot topic in its current research field.Based on the research status of methanol anode catalysts,this paper carried out the following research contents:Firstly,Therefore,simple hydrothermal method,3 h low temperature phosphating process and traditional NaBH₄ reduction method are applied,successfully realizing assemble Pt nanocomponents on Ni₂CuP/C materials.We adjusted the hydrothermal time t required for the synthesis of Ni₂CuP/C composite materials and screening the optimal molar ratio of nickel acetate and copper sulfate,followed by electrochemical testing.Electrochemical research analysis shows that when hydrothermal reaction is carried out at 90℃for 6 h,and the molar ratio of Ni salt to Cu salt is 2:1,Pt-Ni₂CuP/C catalyst with excellent catalytic performance for anodic oxidation of DMFCs can be obtained.Secondly,the previous work confirmed that bimetallic phosphide as a base material to carry platinum is more advantageous than single metal phosphide in the catalysis of methanol oxidation.A bimetallic FeNi₂P/C composite was synthesized using a safe and cost-effective research method,and it was used as a methanol fuel cell anode catalyst carrier to support Pt nanoparticles.FE-TEM studies have shown that due to the phosphating effect of bimetals,Pt nanoparticles have a very small size（1.88 nm）and are uniformly dispersed and deposited on the catalyst support.Electrochemical test analysis shows that when the molar ratio of n（FeSO₄·7H₂O）and n（Ni（NO₃）₂·6H₂O）is1:2,after the hydrothermal reaction at 140℃for 12 h,The mass specific activity of the Pt-FeNi₂P/C composite material(1125 mA·mg_Pt^-1)is 3.9 times than that of the self-made Pt/C-JM(283 mA·mg_Pt^-1)catalyst.In addition,due to the synergy between Fe atoms and Ni atoms,the catalyst obtained by bimetallic FeNi₂P as a base material supporting platinum exhibits more excellent performance,catalytic activity and anti-CO poisoning ability than single-metal Pt-FeP₄/C and Pt-Ni₂P/C catalysts.