To develop low-cost and efficient oxygen reduction
reaction (ORR) catalysts, a novel hybrid comprising
cobalt-embedded nitrogen-doped carbon nanotubes and nitrogen-
doped reduced graphene oxide (Co-NCNT/NrGO-800)
was simply prepared by pyrolysis. The combination of nanotubes
and graphene, and the efficient doping with cobalt
and nitrogen, greatly contribute to the excellent ORR performance.
This optimized Co-NCNT/NrGO catalyst exhibits
a positive onset potential of 0.91 V and a half-wave potential
of 0.82 V, combined with a relatively low peroxide yield,
better durability, and better methanol tolerance than commercially
available Pt/C, which makes it a promising candidate
as a low-cost and effective non-precious-metal ORR catalyst.