High-Performance Electrocatalysts for Oxygen Reduction Derived from Polyaniline, Iron, and Cobalt
添加于 2011/4/24 12:14:51 6413次阅读 | 0次推荐 | 4个评论
The prohibitive cost of platinum for catalyzing the cathodic oxygen reduction reaction (ORR) has hampered the widespread useof polymer electrolyte fuel cells. We describe a family of non–precious metal catalysts that approach the performance of platinum-basedsystems at a cost sustainable for high-power fuel cell applications, possibly including automotive power. The approach usespolyaniline as a precursor to a carbon-nitrogen template for high-temperature synthesis of catalysts incorporating iron andcobalt. The most active materials in the group catalyze the ORR at potentials within ~60 millivolts of that delivered by state-of-the-artcarbon-supported platinum, combining their high activity with remarkable performance stability for non–precious metal catalysts(700 hours at a fuel cell voltage of 0.4 volts) as well as excellent four-electron selectivity (hydrogen peroxide yield <1.0%).