Synthesis Of Pt-based Alloy Nanocatalyst Using Protein Molecules And Their Catalytic Performance Investigation

Platinum based catalysts are widely used in many fields such as fuel cells,owig to the advantages of catalysis,magnetism,optics.But short resources and high cost hinder the process of the commercialization of fuel cells.Pt-based alloy catalysts have aroused increasing attention,owing to their low platinum loading,improved catalytic activity and durability.In this text,insulin amyloid fibrils(INSAFs)were used as templates to control the synthesis of VT-PtRh nanowires,1D Pt-Rh-Pd nanochains,Pt-Fe nanowres and Pt-Fe-Ni nanowires successfully.The component,morphology and structure of the synthesized Pt-based alloy nanomaterials are characterized by XRD,HRTEM,XPS and TEM.At the same time,the electrochemical performance was studied.The main results were summarized as follows:(1)The INSAFs were used as templates to synthesis VT-PtRh nanowires and 1D Pt-Rh-Pd nanochains.The diameter of the particles was uniform at 2.0 nm.All particles were distributed along the helical structure of the INSAFs,which assembled into one dimensional structure with length up to micron levels.The influencing factors such as the mole ration of PtCl4,RhCl3 and K2PdCl6,solvent concentrations and reducing agents were studied.Electrochemical test showed the forward peak current densities of VT-PtRh nanowires and Pt-Rh-Pd nanochains were 1.07 m A cm-2 and 1.48 mA cm-2,about 1.2 and 1.7 times higher than that of the commercial Pt/C(0.89 mA cm-2)toward methanol oxidation reaction(MOR),respectively.(2)Ultralong Pt-Fe nanowires and Pt-Fe-Ni nanowires with diameter of 2.0 nm were synthesized by using the INSAFs.The influencing factors as metal mole ration,solvent concentrations and protein concentrations were investigated.Electrochemical test showed the forward peak current densities of Pt-Fe nanowires and Pt-Fe-Ni nanowires were 2.21 mA cm-2 and 4.18 mA cm-2,respectively,about 2.5 and 4.7 times higher than that of the commercial Pt/C(0.89 mA cm-2)toward methanol oxidation reaction(MOR);the forward peak current densities of Pt-Fe nanowires and Pt-Fe-Ni nanowires were 1.01 mA cm-2 and 1.94 mA cm-2,respectively,about 1.4 and 2.7 times higher than that of the commercial Pt/C(0.71 mA cm-2)toward enthanol oxidation reaction(EOR).Oxygen reaction reduction reaction(ORR)displayed two products with higher ORR specific and mass activities than the commercial Pt/C catalyst.Among this,the specific activity of Pt-Fe-Ni catalyst was 66% higher than that of commercial Pt/C.