Cathodic Reduction of Oxygen and Hydrogen Peroxide at Cobalt and Iron Crowned Phthalocyanines Adsorbed on Highly Oriented Pyrolytic Graphite Electrodes
Abstract
The surface electrochemistry of iron and cobalt crowned phthalocyanine (FeIICRPc(-2) or CoIICRPc(-2)) adsorbed on a highly oriented pyrolytic graphite (HOPG) electrode has been explored under an argon atmosphere. The redox processes of surface bound, COIICRPc(-2)/(CoICRPc(-2)-, FeIIICRPc(-2) +/FeIICRPc(-2), and FeIICRPc(-2)/(FeICRPc(-2) couples were identified and their pH dependence reported in the range 1-13. Under an oxygen atmosphere at the CoIICRPc(-2)/HOPG electrode, two reduction processes, oxygen to hydrogen peroxide and hydrogen peroxide to water were clearly delineated, and their pH dependences explored. Surface bound FeIICRPc(-2) catalyses the four electron reduction of oxygen in alkaline medium. The CoIICRPc(-2)/HOPG electrode is very stable both in the presence and absence of oxygen, but the FeII CRPc(-2)/HOPG electrode is much less stable when electrocatalytic oxygen reduction takes place on its surface.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 23, 1992
- Accession Number
- ADA257473
Entities
People
- Alfred Beverley Philip Lever
- Nagao Kobayashi
- Pavel Janda
Organizations
- University of York