Oxygen Reduction on Graphene−Carbon Nanotube Composites Doped Sequentially with Nitrogen and Sulfur

摘要: The development of unique, reliable, and scalable synthesis strategies for producing heteroatom-doped nanostructured carbon materials with improved activity toward the electrochemical oxygen reduction reaction (ORR) occurring in metal–air batteries fuel cells presents an intriguing technological challenge field catalysis. Herein, we prepare unique graphene–carbon nanotube composites (GC) doped sequentially both nitrogen sulfur (GC-NLS) subject them to extensive physicochemical characterization evaluation ORR alkaline electrolyte. GC-NLS provides onset potential increases 50 70 mV comparison those dual-doped individual graphene nanotubes, respectively. This highlights significant synergistic effects that arise because nanocomposite arrangement, consisting highly graphitized nanotubes assembled on surface sheets. addition as a co-dopant is also beneficial, ...