Nest-like assembly of the doped single-walled carbon nanotubes with unique mesopores as ultrastable catalysts for high power density Zn-air battery

Uniform nest-like structures with unique pore sizes were prepared by self-assembly of oxidized single-walled carbon nanotubes (SWCNT). After doping with cobalt and nitrogen, the assembly exhibited much higher electrocatalytic activity and stability for oxygen reduction reaction than the Pt/C catalyst. As an air electrode catalyst for a Zn-air battery, its power density reached 248 mW cm−2, superior to that of Pt/C (195 mW cm−2) and other non-precious metal catalysts ever reported.345