Iron-Based Catalysts with Improved Oxygen Reduction Activity in Polymer Electrolyte Fuel Cells
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Abstract
Iron-based catalysts for the oxygen-reduction reaction in polymer electrolyte membrane fuel cells have been poorly competitive with platinum catalysts, in part because they have a comparatively low number of active sites per unit volume. We produced microporous carbon-supported iron-based catalysts with active sites believed to contain iron cations coordinated by pyridinic nitrogen functionalities in the interstices of graphitic sheets within the micropores. We found that the greatest increase in site density was obtained when a mixture of carbon support, phenanthroline, and ferrous acetate was ball-milled and then pyrolyzed twice, first in argon, then in ammonia. The current density of a cathode made with the best iron-based electrocatalyst reported here can equal that of a platinum-based cathode with a loading of 0.4 milligram of platinum per square centimeter at a cell voltage of >/=0.9 volt.
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The record
- Venue
- Science
- Topic
- Electrocatalysts for Energy Conversion
- Field
- Energy
- Canadian institutions
- Institut National de la Recherche Scientifique
- Funders
- —
- Keywords
- CatalysisPlatinumMicroporous materialInorganic chemistryElectrocatalystElectrolyteChemistryFerrousCarbon fibersProton exchange membrane fuel cellOxygenCarbon blackCathodeChemical engineeringMaterials scienceElectrodeElectrochemistryOrganic chemistryNatural rubberComposite number
- Has abstract in OpenAlex
- yes