A bifunctional catalyst combining iron porphyrin for CO 2 RR and viologen units to selectively divert O 2 reduction was developed. While a dominant ORR over CO 2 RR was observed in homogeneous conditions, the reactivity shifted once heterogenized onto MWCNTs, achieving a 62% FE(CO) under 5% O 2 .
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Rashid et al. (2025) studied this question.
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