Electrochemical reactivity in nanoscale domains: O2 reduction on a fullerene modified gold surface.
Fullerene is strongly adsorbed on both single crystal and polycrystalline gold surfaces and its specific adsorption resulted in the formation of high coverage large hexagonal rafts with strong interactions between the adsorbed fullerene molecules and the Au substrate. The oxygen reduction reaction (ORR) was investigated on these surfaces to determine their influence on the reduction mechanism. Oxygen reduction did not take place on the fullerene overlayer but proceeded on the sub-nanometer sized exposed pockets of the underlying Au substrate. Reduction at these confined sites produces hydrogen peroxide selectively. This effect is ascribed to the blocking action, or so-called "third body effect", of the adsorbed fullerene molecules, which do not display electrocatalytic properties for oxygen reduction.
Kuzume
Akiyoshi
A
Centre for Nanoscale Science, Department of Chemistry, University of Liverpool, Liverpool, UK L69 7ZD.
Herrero
Enrique
E
Feliu
Juan M
JM
Ahlberg
Elisabet
E
Nichols
Richard J
RJ
Schiffrin
David J
DJ
D002384:Catalysis; D003460:Crystallization; D004563:Electrochemistry / Q000379:methods*; D037741:Fullerenes / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry; D008422:Materials Testing; D049329:Nanostructures / Q000737:chemistry; D036103:Nanotechnology / Q000379:methods*; D010100:Oxygen / Q000737:chemistry; D013499:Surface Properties
D037741:Fullerenes; D006046:Gold; D006861:Hydrogen Peroxide; D010100:Oxygen