科研之友
微信
新浪微博
Facebook
分享链接
摘要
A series of green techniques for synthesized carbon nanotube-supported platinum nanoparticles and their high electrocatalytic activity toward methanol fuel cell applications are reported. The techniques utilize either the supercritical fluid carbon dioxide or water as a medium for depositing platinum nanoparticles on surfaces of multiwalled or single-wailed carbon nanotubes. The catalytic properties of the carbon nanotubes-supported Pt nanoparticle Catalysts prepared by four different techniques are compared for anodic oxidation of methanol and cathodic reduction of oxygen using cyclic voltammetry. One technique using galvanic exchange of Pt(2+) in water with zerovalent iron present oil the surfaces of as-grown single-walled carbon nanotubes produces a Pt catalyst that shows all unusually high catalytic activity for reduction of oxygen but I negligible activity for oxidation of methanol. This fuel-selective catalyst may have a unique application its a cathode catalyst in methanol fuel cells to alleviate the problems Caused by crossover of methanol through the polymer electrolyte membrane.
- 出版日期2010-3-25
