Electrochemical Reduction of CO₂ to CO by N,S Dual‐Doped Carbon Nanoweb Catalysts

Abstract

Abstract Converting CO 2 into useful chemicals through an electrocatalytic process is an attractive solution to reduce CO 2 in the atmosphere. However, the process suffers from high overpotential, low activity, or poor product selectivity. In this study, N,S dual‐doped carbon nanoweb (NSCNW) materials were proposed as an efficient nonmetallic electrocatalyst for CO 2 reduction. The NSCNW catalysts preferentially and rapidly converted CO 2 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. A small Tafel slope value (93 mV dec −1 ) was obtained, demonstrating a high rate for CO 2 reduction. Moreover, the catalysts also exhibited a quite stable current‐density profile during 20 h with a high CO Faradaic efficiency above 90 % throughout the electrolysis reaction. The high catalytic performance of the catalysts for CO 2 reduction could be attributed to synergistic effects associated with the structural advantages of 3 D carbon nanoweb structures and effective S doping of the carbon materials with the highest ratio of thiophene‐like S to oxidized S species.