Replacing expensive and rare platinum with metal–nitrogen–carbon catalysts in proton exchange membrane fuel cells is limited by their lower activity and stability for oxygen reduction reactions. The authors report Fe-N-C catalyst with trace Br ions to enhance Fe-N4 density and introduce defects and mesopores, achieving high activity for oxygen reduction reaction in proton exchange membrane fuel cell.
- Shuhu Yin
- Long Chen
- Shigang Sun
