Single‐Crystalline C 60 Nanostructures by Sonophysical Preparation: Tuning Hollow Nanobowls as Catalyst Supports for Methanol Oxidation

Large‐scale single‐crystalline hollow nanobowls of pure C 60 were prepared by applying a sonophysical strategy in a binary organic solution. Through the simple adjustment of the concentration of the C 60 / m ‐xylene solution and the volume ratio of m ‐xylene to acetonitrile, C 60 nanorings, nanoplates, nanorods, and nanowires were also selectively synthesized. The promise of the C 60 hollow structures as Pt catalyst supports is heightened by the significantly enhanced catalytic activity toward methanol oxidation for a given amount of C 60 used, which demonstrates their potential application in fuel cells.