Abstract and subjects
Platinum group metal (PGM)‐free catalysts for oxygen reduction reaction have shown high oxygen reduction reaction activity in alkaline media. In order to further increase the power density of anion‐exchange membrane fuel cells (AEMFCs), PGM‐free catalysts need to have a high site density to reach high current densities. Herein, synthesis, characterization, and utilization of heat‐treated iron porphyrin aerogels are reported as cathode catalysts in AEMFCs. The heat treatment effect is thoroughly studied and characterized using several techniques, and the best performing aerogel is studied in AEMFC, showing excellent performance, 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 the state‐of‐the‐art for PGM‐free based AEMFCs.
Fe‐porphyrin aerogels are studied as oxygen reduction reaction catalysts for anion‐exchange membrane fuel cells (AEMFCs). The structure, chemistry, catalytic site dispersity, and density are studied. The best performing aerogel, heat‐treated at 800 °C, shows very high activity in AEMFC, on par with the state‐of‐the‐art platinum group metal‐free based AEMFCs.