Studies On Preparation And Durability Of The Pt/Co Alloy Catalyst Modified By Au

As a future alternative to one of the fixed and mobile power proton exchange membrane fuel cell (PEMFC), the research and development in recent years it has made great progress. Pt alloy catalysts in PEMFC catalyst can have a higher electrochemical activity and to reduce the amount of precious metals Pt, binary alloys and ternary alloy catalysts has been a lot of research and over the past few years has made significant progress. But a common question is, Pt-base metal alloys in the base metal in the acidic solution will be dissolved. Dissolve the alloying elements spread out the proton exchange membrane MEA will accelerate the aging film. To this end, we study the process of Au atoms into the platinum nanoparticles surface modified to enhance alloy catalyst oxidation potential inhibition of dissolution of base metal alloy catalysts. Based on the above theory, this paper synthesized Au modified Pt-Co alloy catalysts, and electrochemical properties of the catalyst, electrochemical stability were studied.First use of liquid phase deposition-high temperature alloy prepared Pt-Co alloy catalysts, the average diameter of about 5nm. Followed by reduction, use of nano-Pt alloy surface adsorption amount of copper reduction tetrachloroaurate (HAuC14), prepared by surface modification of nano-Au atomic Pt-Co catalyst, and accelerated through the CV method and its stability analysis of the dissolution rate studied. The results show that, Pt-Co catalysts and Au modified Pt-Co catalysts in comparison, Pt/Co catalysts in 3000 after the CV speed decreased to 61% of its activity, while the Au modified Pt-Co catalysts in 3000 accelerated its CV activity decreased to 64%. Description Au modified Pt-Co catalyst has a better electrochemical stability.CV accelerated in the post-6000 sub-atomic absorption spectrometry electrolyte test results indicate that Pt-Co alloy catalyst for the dissolution rate of 5.2%, while the Au modified Pt-Co alloy catalyst for the dissolution rate of 1.1%. Au modified Pt-Co Co alloy catalysts to inhibit corrosion, reduce the base metal ions on the cell damage. The study confirmed the gold modified by Pt-Co alloy catalyst for enhancing the catalytic oxidation-reduction potential of metal corrosion inhibition of Co Pt-Co alloy to improve the durability of the catalyst idea is feasible.