Carbon Containing Au-based Low Temperature Fuel Cell Anode Catalysts For The Electrochemical Performance

As it has many advantages,such as high efficiency, no pollution, no noise, wide range of applications, and the advantages of continuous work has broad application prospects. How to improve the existing platinum catalyst activity, anti-poisoning ability and utilization of, or developed high efficiency, low cost non-platinum catalyst were the key technical problems for fuel cell commercialization. Methanol, ethanol, formic acid and other small molecular organic compounds is a important fuel source fuel cells.The electronegativity strong precious metals Au (X=2.4)be usted the core of Catalyst, with higher catalytic activity Pt, Pd nanoparticles composite the shell of catalysts. Used the Au for the shell of the Pt (or Pd), promoting the shell of metal electro-catalytic oxidation.Photochemical synthesis of Au core@ Pt shell and Au core@ Pd shell composite nanoparticles as catalytic material, the composite nanoparticles was supurt by the XC-72 carbon black, the preparation of Au core@ Pt shell/C and Au core@ Pd shell/C catalyst. the cyclic voltammetry (CV), linear sweep voltammetry (LSV) and time-current (IT) can be used to test that the two pairs of noble metal catalyst for the methanol (or formic acid) to the electrocatalytic oxidation catalysts have high activity and better stability.high activity of The composite catalysts while the mechanism is discussed briefly.The main conclusions are as follows:(1) by UV-Vis absorption spectra, TEM, XPS and other means of representation, confirmed the Au@ Pt and Au@ Pd bimetallic nanoparticles with core-shell composite structure, when the shell of metal Pt (or Pd) molar ratio than low bimetallic nanoparticles did not form a complete shell, but the strawberry-shaped formation of Au core@ Pt (or Pd) Shell Nanoparticles.(2) XPS analysis shows that, Au@ Pt core shell composite nanoparticles and Au@ Pd core shell composite nanoparticle, Au check dissimilar metals (Pt, Pd) were obviously shell for electronic effects for the size of electronic effects and the concentration of Au, with Au concentration increases.(3) Electrochemical analysis shows that:Au@ Pt core shell nanoparticles, Au@ Pd nanoparticles preparation of nuclear dual-metal catalysts for methanol and formic acid oxidation of high electrical activity, indicating check Au Pt (or Pd) shell with promoted to enhance the Au@ Pt core Au shell and core@Pd nanoparticles shell composite structure of the electrocatalytic activity. On the Au core@ Pt (or Pd) shell nanoparticles, Au check dissimilar metals (Pt,Pd) for the shell to do kind of electronic effect and role of the Pt (or Pd) shell for the mechanism of catalytic activity was analyzed.(4) Au:Pd (4:1) Au@ Pd/C catalyst for electrocatalytic oxidation of formic acid without catalytic activity, probably due to Pd particles do not form a complete shell,but the formation of strawberry Au core@ Pd shell nanocomposite particles, the surface of Pd nanoparticles the lattice is not continuous, and the lack of catalytic active sites caused by other reasons.