Bacteria-derived atomically dispersed iron–nitrogen–phosphorus active sites for boosting electrochemical CO2 reduction kinetics

Abstract

The construction of efficient electrocatalysts is key in harnessing the electrochemical CO2 reduction reaction (CRR) to produce high-value chemicals. Herein, a typical bacterium containing metal–nitrogen (M−N) groups and with a rich phosphorus content, Shewanella oneidensis MR-1, was used as a single precursor to produce atomically dispersed iron–nitrogen–phosphorus active sites (P–Fe/NC-1000) for converting CO2 to CO. Excellent CO selectivity of nearly 100% at 390 mV overpotential was achieved with good stability, and a rechargeable Zn–CO2 battery provides a maximum power density of 1.32 mW cm−2. Kinetic isotope effect measurements revealed that the presence of P atoms accelerates water dissociation and transfers a proton to Fe centers to promote protonation of intermediates and the overall CRR process. This synthesis strategy based on the intrinsic structure of a precursor may inspire the development of other high-performance catalysts for diverse electrochemical reactions beyond the CRR .

Keywords

• Shewanella oneidensis MR-1
• Phosphorus
• Iron–nitrogen sites
• CO2 electroreduction
• Kinetics