Iron-based cathode catalyst with enhanced power density in polymer electrolyte membrane fuel cells

摘要: H(2)-air polymer-electrolyte-membrane fuel cells are electrochemical power generators with potential vehicle propulsion applications. To help reduce their cost and encourage widespread use, research has focused on replacing the expensive Pt-based electrocatalysts in a lower-cost alternative. Fe-based cathode catalysts promising contenders, but density been low compared cathodes, largely due to poor mass-transport properties. Here we report an iron-acetate/phenanthroline/zeolitic-imidazolate-framework-derived electrocatalyst increased volumetric activity enhanced The zeolitic-imidazolate-framework serves as microporous host for phenanthroline ferrous acetate form catalyst precursor that is subsequently heat treated. A made best from this work, tested H(2)-O(2,) of 0.75 W cm(-2) at 0.6 V, meaningful voltage operation, comparable commercial under identical conditions.