| 摘要 |
The invention is a composition, comprising: a carbon-supported, dispersed platinum-zinc alloy having the formula Pt-Zn x/C wherein x ranges from greater than 0.05 to less than 1 wherein platinum is in the form of platinu m particles ranging in size from about 20.ANG. to about 30.ANG. on a carbon suppor t, wherein the carbon is in the form of high surface area carbon having surface are a ranging from about 100 to about 500 m2/g, and the platinum particles are present in an amount ranging from about 10 to about 40 wt% on the carbon support. The composition is made by the process of depositing on the carbon support a soluble zinc source selected from the group of zinc nitrate, acetate, halides, formates, oxalates, and acetyl acetonates and mixtures thereof ; calcining to convert the zinc source to ZnO; and then reducing the zinc oxide at a temperature ranging from about 250.degree.C to about 600.degree.C, in the pres ence of hydrogen at a pressure ranging from about 1 atmosphere (100 KPa) to about 10 atmospheres (1000 KPa), or by the process of admixing zinc powder with Pt/C powder; and heating the mixture under a reducing atmosphere at a temperature sufficient to produce the Pt-Zn x/C alloy, wherein x ranges from greater than 0. 05 to less than 1. The invention has utility in fuel cells in electrochemical processes requiring CO tolerant anodes. |
