Fe and N co-doped carbon with High doping content of sulfur and nitrogen for efficient CO2 electro-reduction

The low density of active sites for transition metal and N, S co-doped carbon catalyst limits the catalytic activity of CO2 electroreduction reaction (CO2RR). Herein, we synthesize a S and N dual-doped carbon-based catalyst (FeSA-S/N-C) with a high doping content for efficient electroreduction of CO2 to CO. During the synthesis process, the precursor is coated with a layer of SiO2, which prevents the formation of FeS nanoparticles and trap the volatile heteroatom during the heat treatment. The sulfur and nitrogen doping content within the final catalyst are 1.73 and 6.59 at %. The FeSA-S/N-C catalyst presents an outstanding catalytic activity and selectivity toward CO2RR with with remarkable total current density (5.11 mA cm(-2)) and high Faradaic efficiency (similar to 96.3 %) at -0.49 V (vs. RHE). The experiment results testify the introduce of sulfur can significantly expedite the kinetics rate for the CO formation. This work opens up new avenues to synthesize advanced Non-precious metal catalyst for efficient CO2 electroreduction reaction.