| 摘要 |
Disclosed is a method for preparing a platinum/support catalyst or a platinum alloy/support catalyst, including: a) preparing a dispersion solution including urea, a support and a water-soluble salt of at least one metal(s) having catalytic activity; (b) reacting the dispersion solution at high temperature so as to deposit the metal hydroxide particles derived from the at least one metal(s) on the support; and (c) reducing the metal hydroxide particles. The size and distribution of the platinum particles or platinum alloy particles are greatly improved by the use of urea. The disclosed method allows loading of platinum particles or platinum alloy particles having small particle size and uniform size distribution on the support since hydroxide ions homogenously generated in situ by the hydrolysis of urea react with metal salts to form the catalyst complex species deposited on the support. Thus, when used as an electrode catalyst of a fuel cell, the platinum/support catalyst or the platinum alloy/support catalyst may greatly enhance the catalytic activity for oxidation of fuel, e.g. methanol or hydrogen, as well as reduction of oxygen and the fuel cell polarization performance. Furthermore, the disclosed method is environment-friendly and cost-effective since an electrode catalyst of a fuel cell may be prepared relatively simply at low cost without resort to a complicated process and without using expensive reducing agents such as NaBH4 or surfactants for ensuring uniform dispersion of catalyst particles.
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