Dioxygen Reduction at a Graphite Electrode Modified by Mononuclear Tetraneopentoxyphthalocyaninatocobalt(II) and Related Polynuclear Species

Abstract

Potentiodynamic data were obtained under argon for the mononuclear species tetraneopentoxyphthalocyaninatocobalt (II) species adsorbed on glassy carbon (GC), ordinary pyrolytic graphite (OPG) and highly oriented pyrolytic graphite (HOPG). Comparative data show that the most convenient material to use is HOPG whereon a limiting monolayer is apparently achieved. Data were also presented for the mononuclear and polynuclear analogues on HOPG under both argon and dioxygen. Comparison is made of the potential data obtained in water and in organic solvent. A pH dependence study shows that the dioxygen reduction potential tracks the Co(II)TNPc/Co(I)TNPc redox couple with a slope of approximately -65mV/pH for the mononuclear species. There is no pH dependence in the alkaline regime. Possible mechanisms are discussed. Phthalocyanine; Oxygen reduction; Stress annealed graphite; Cobalt compounds.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1989
Accession Number
ADA205715

Entities

People

  • C. C. Leznoff
  • Hung‐Ming Lam
  • N. Kobayashi
  • P. Janda
  • P. R. Auburn

Organizations

  • University of York

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  • Air Platforms
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  • Active Denial System
  • Air Force
  • Chemical Engineering
  • Chemical Synthesis
  • Chemistry
  • Coefficients
  • Electrodes
  • Engineering
  • Equations
  • Films
  • Graphitic Materials
  • Materials
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  • Military Research
  • New York
  • Organic Solvents
  • Rocket Oxidizers

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  • Electrochemical Engineering/ Fuel Cell Technologies
  • Electrochemical Surface Science