Predictable interfacial mass transfer intensification of Sn–N doped multichannel hollow carbon nanofibers for the CO2 electro-reduction reaction†
Abstract
A series of Sn and N co-doped carbon fibers featuring rich mesoporous and controllable multichannel hollow structures (SnN-HFs) were synthesized by electrospinning for the electrochemical CO2 reaction reduction (CO2RR) toward CO. The SnN-HFs, endowed with enhanced CO2 adsorption capacity, enabled more than 4 times higher Sn-normalized CO partial current densities in a wide overpotential compared with unadjusted nanofibers without hollow structures. Kinetics simulations suggested that the intensified interfacial mass transfer of CO2 and stabilized high-loading intermediate CO2,ads contribute overwhelmingly to the improved CO2RR performance.