International Journal of Hydrogen Energy, Vol.45, No.19, 11321-11329, 2020
Interrelations between sulfur, iron, nitrogen, pore and graphite matrix for oxygen reduction reaction
Nitrogen doped lotus-stem carbon and that being promoted by sulfur or iron (N-LC, NS-LC, NFe-LG and NSFe-LG) are synthesized. The interrelations between pore size, graphitization degree, N content, Fe-N content, S doping, and their effects on oxygen reduction reaction (ORR) activity and stability in alkaline media are studied. The NSFe-LG shows the most excellent performances for ORR. The Fe-free NS-LC shows close ORR activity and comparable stability to the NSFe-LG, which may make metal-free catalyst attractive. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.