Abstract
Platinum group metal (PGM)-free catalysts for oxygen reduction reaction (ORR) have shown high oxygen reduction reaction activity in alkaline media. In order to reduce the overpotential losses in anion-exchange membrane fuel cells (AEMFCs), PGM-free catalysts need to have a high site density to compensate for their which will enable reaching high cell current and power densities. Herein, we will present our work on the synthesis, characterization, and utilization of heat-treated iron porphyrin aerogels as cathode catalysts in AEMFCs. The heat treatment effect was thoroughly studied using several techniques, and the best performing aerogel was showing an excellent performance in AEMFCs, reaching a peak power density of 580 mW cm-2 and a limiting current density of as high as 2.0 A cm-2, which can be considered as the state-of-the-art for PGM-free based AEMFCs.
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