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Published December 4, 1996 | public
Journal Article

Enhancement of the Catalytic Activity of a Macrocyclic Cobalt(II) Complex for the Electroreduction of O_2 by Adsorption on Graphite

Abstract

In solution, the [(tim)Co]^(2+) complex (tim = 2,3,9,10-tetramethyl-1,4,8,11-tetraazacyclotetradeca-1,3,8,10-tetraene) reacts only slowly with O_2, but upon adsorption on graphite electrodes it becomes an active catalyst for the reduction of O_2 to H_2O_2. The remarkable enhancement in catalytic activity is attributed to a higher affinity for O_2 of the adsorbed complex as a result of its interaction with functional groups on the surface of roughened or oxidized graphite. A possible catalytic mechanism is proposed.

Additional Information

© 1996 American Chemical Society. Received July 17, 1996. Publication Date (Web): December 4, 1996. This work was supported by the National Science Foundation. I.B. was the grateful recipient of an A. A. Noyes Postdoctoral Fellowship at Caltech. Discussions with Dr. Beat Steiger were stimulating and very helpful.

Additional details

Created:
August 19, 2023
Modified:
October 18, 2023