Electrocatalytic aspects of iron phthalocyanine and its μ-oxo derivatives dispersed on high surface area carbon

A. A. Tanaka, C. Fierro, Daniel Alberto Scherson, E. B. Yeager

研究成果: Article

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The cyclic voltammetry of iron phthalocyanine (FePc) and its two μ-oxo derivatives obtained by mixing the materials in dry form with high-area Vulcan XC-72 carbon yielded a common set of voltammetric peaks. This provides evidence for the presence of a single type of surface species for the macrocycle in its various forms. The electrochemical activity of these dispersed specimens for O2 reduction in alkaline media using thin porous coating-rotating disk techniques was found to be essentially the same for both μ-oxo derivatives. Comparable activities were observed in the case of bulk monomeric FePc only after polarizing the electrodes at fairly negative potentials. Some differences in activity were observed, however, for the materials in gas-fed electrodes of the type used in fuel cells in 4 M NaOH at 60°C. Based on the results obtained in this work and quantum mechanical considerations, it has been concluded that (i) the increase in conductivity induced by the exposure of FePc to dioxygen is most likely due to the formation of μ-oxo-type derivatives, and (ii) it is not necessary to invoke a metal spin crossover mechanism as the key factor in explaining the high electrocatalytic activity of FePc for the reduction of O2, as has been proposed earlier in the literature.

元の言語English
ページ(範囲)3799-3807
ページ数9
ジャーナルJournal of physical chemistry
91
発行部数14
出版物ステータスPublished - 1987 12 1
外部発表Yes

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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