Chem. Sci., 2025, Advance Article DOI: 10.1039/D5SC02722E, Edge Article Haroon Rashid, Diana Dragoe, Atanu Rana, Serena DeBeer, Philipp Gotico, Winfried Leibl, Ally Aukauloo A bifunctional catalyst combining iron porphyrin for CO2RR and viologen units to selectively divert O2 reduction was developed. While a dominant ORR over CO2RR was observed in homogeneous conditions, the reactivity shifted once heterogenized onto MWCNTs, achieving a 62% FE(CO) under 5% O2.