Isolated iron single-atom sites for oxygen reduction derived from a porphyrin-based carbon sphere by a polymerization–coordination–pyrolysis strategy

The Fe-ISAS/CN catalyst obtained by a polymerization–coordination–pyrolysis strategy exhibited excellent catalytic performance for alkaline oxygen reduction reaction (ORR) and Zn–air batteries, with a half-wave potential of 0.881 V vs. RHE.