Accession Number : ADA257473


Title :   Cathodic Reduction of Oxygen and Hydrogen Peroxide at Cobalt and Iron Crowned Phthalocyanines Adsorbed on Highly Oriented Pyrolytic Graphite Electrodes


Descriptive Note : Technical rept. no. 47, Jun 1991-Jul 1992


Corporate Author : YORK UNIV TORONTO (ONTARIO) DEPT OF CHEMISTRY


Personal Author(s) : Kobayashi, Nagao ; Janda, Pavel ; Lever, A B


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a257473.pdf


Report Date : 23 Oct 1992


Pagination or Media Count : 33


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.


Descriptors :   *ADSORPTION , *HYDROGEN , *IRON , *PHTHALOCYANINES , *ELECTRODES , *COBALT , *PYROLYTIC GRAPHITE , *OXYGEN , WATER , CATALYSTS , ATMOSPHERES , HYDROGEN PEROXIDE , PEROXIDES , ARGON , ETHERS , ELECTRONS , SURFACES , REDUCTION , ELECTROCHEMISTRY , GRAPHITE


Subject Categories : Inorganic Chemistry
      Physical Chemistry


Distribution Statement : APPROVED FOR PUBLIC RELEASE