  We report the nanodiamond-derived onion-like carbon successfully applied as
an electrocatalyst for [VO]2+/[VO2]+ redox flow battery, as drop-coated (in the
as-synthesized state) on glassy carbon or carbon felt electrodes. We show that
its reversibility and catalytic activity in its as-synthesized state was
comparable to some of the best data in the literature which employed surface
modifications. We clarified the origin of such excellent performances by
physical/electrochemical analyses.
