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Comparison of the Behavior of Several Cobalt Porphyrins as Electrocatalysts for the Reduction of O_2 at Graphite Electrodes

Song, Euihwan and Shi, Chunnian and Anson, Fred C. (1998) Comparison of the Behavior of Several Cobalt Porphyrins as Electrocatalysts for the Reduction of O_2 at Graphite Electrodes. Langmuir, 14 (15). pp. 4315-4321. ISSN 0743-7463. https://resolver.caltech.edu/CaltechAUTHORS:20180719-161207344

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Abstract

Four cobalt porphyrins were adsorbed on graphite electrodes and used to catalyze the electroreduction of O_2. The two porphyrins without substituent groups in the meso positions of the porphyrin ring operated at the most positive potentials and catalyzed the reduction of O_2 to both H_2O_2 and H_2O, but the H_2O did not result from significant reduction of H_2O_2. The porphyrins containing meso substituents catalyzed only the reduction of O_2 to H_2O_2. The catalysts that accomplish the four-electron reduction of O_2 are argued to consist of dimeric (or higher oligomeric) forms of the adsorbed porphyrins. The present results and those of two recent related studies indicate that the presence of only hydrogen or small alkyl groups in the meso positions of porphyrin rings facilitates the spontaneous formation of van der Waals dimers with greater catalytic activity for the reduction of O_2 by four electrons. Such cobalt porphyrins were also found to be unusually active catalysts for the electro-oxidation of H_2O_2.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://dx.doi.org/10.1021/la980084dDOIArticle
Alternate Title:Comparison of the Behavior of Several Cobalt Porphyrins as Electrocatalysts for the Reduction of O2 at Graphite Electrodes
Additional Information:© 1998 American Chemical Society. Received January 21, 1998. In Final Form: May 18, 1998. E.S. is grateful for a Fellowship provided by the Korea Science and Engineering Foundation. The work was also supported by the U. S. National Science Foundation.
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Korea Science and Engineering FoundationUNSPECIFIED
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Issue or Number:15
Record Number:CaltechAUTHORS:20180719-161207344
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180719-161207344
Official Citation:Comparison of the Behavior of Several Cobalt Porphyrins as Electrocatalysts for the Reduction of O2 at Graphite Electrodes Euihwan Song, Chunnian Shi, and Fred C. Anson Langmuir 1998 14 (15), 4315-4321 DOI: 10.1021/la980084d
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:88039
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:19 Jul 2018 23:17
Last Modified:03 Oct 2019 20:02

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