A nitrogen-rich porous carbon electrocatalyst derived from supramolecular polymer-encapsulated iron precursors for the oxygen reduction reaction

A cucurbit[7]uril-bridged acrylic acid polymer (CB7&PAA) synthesized via one-pot Fc encapsulation integrates FeCl 2 /CsBr/ZnCl 2 . Freeze-drying/carbonization yields Fe 1,2 –N–C single-atom catalyst with high ORR activity (0.91 V half-wave, 5.50 mA cm −2 ).