[Abstract]

Converting CO₂ into useful chemicals via electrocatalytic process is an attractive solution to reduce CO₂ in the atmosphere, but it suffers from high overpotential, low activity or poor product selectivity. In this study, N,S dual-doped carbon nanoweb (NSCNW) materials are proposed as an efficient nonmetallic electrocatalyst for CO₂ reduction. The resultant catalysts preferentially and rapidly convert CO₂ into CO with a high Faradaic efficiency of 93.4 % and a partial current density of – 5.93 mA cm^-2 at a low overpotential of 490 mV. From the Tafel analysis, the smallest value of Tafel slope (93 mV dec^-1) was obtained, demonstrating the highest rate for CO₂ reduction. Moreover, it also exhibits a quite stable current density profile during 20 h with the high CO Faradaic efficiency of 90 % or larger throughout the electrolysis reaction. Its high performance for CO₂ reduction can be attributed to synergistic effect associated with the structure advantages of three-dimensional carbon nanoweb structures and effective S doping on the carbon materials with the highest ratio of thiophene-like S to oxidized S species.

DOI: 10.1002/cssc.201903117

Link:

https://onlinelibrary.wiley.com/doi/full/10.1002/cssc.201903117?af=R