The cathodic reduction of oxygen at cobalt phthalocyanine

Elzing, A; Putten, van; Visscher, Whm Wil; Barendrecht, E Embrecht

doi:10.1016/0022-0728(86)90063-x

Cited by 70 publications

(32 citation statements)

References 12 publications

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“…The behaviour of FeTSPc, with regard to the influence of the layer thickness, differs from that of CoTSPc (Fig. 6), which was previously investigated by us [6]. There, a theoretical description for the ~provement of the activity based on the increased number of active sites is given.…”

Section: Resultsmentioning

confidence: 83%

“…This value is in reasonable agreement with the value of 1.67 x lo-* mol crne2 that can be calculated for the coverage of a 30 mC polypyrrole-FeTSPc layer. The basis of this calculation is the assumption [6] that two electrons per molecule are involved in the oxidation of pyrrole to neutral polypyrrole, and that in the oxidized form of polypyrole every four pyrrole units carries one positive charge. As we have shown earlier [3], no adsorption of FeTSPc occurs on Cp under the conditions used for the electrooxidation of pyrrole.…”

Section: Resultsmentioning

confidence: 99%

“…Oxygen reduction has also been investigated at FeTSPc incorporated in polypyrrole, a conducting polymer, by Bull et al 141. For CoTSPc incorporated in polypyrrole, measurements have been published by Florit et al [5] and also by us [6].…”

Section: Introductionmentioning

confidence: 94%

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The mechanism of oxygen reduction at iron tetrasulfonato-phthalocyanine incorporated in polypyrrole

Elzing

Putten

Visscher

et al. 1987

Journal of Electroanalytical Chemistry and Interfacial Electroc

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Section: Resultsmentioning

confidence: 83%

Section: Resultsmentioning

confidence: 99%

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The mechanism of oxygen reduction at iron tetrasulfonato-phthalocyanine incorporated in polypyrrole

Elzing

Putten

Visscher

et al. 1987

Journal of Electroanalytical Chemistry and Interfacial Electroc

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“…Both CoPc and FePc behave similarly to the water-soluble CoTSPc and FeTSPc [7,14]; only the values of the different redox potentials are somewhat shifted. The high potential of CoPc at low pH is related to the Con/Con1 redox couple.…”

Section: Discussionmentioning

confidence: 90%

“…A good example of such an approach is the work of Zagal-Moya [6], who investigated both the redox potentials and 0, reduction of the water-soluble cobalt and iron tetrasulphonated phthalocyanines (TSPc), adsorbed on pyrolytic graphite, as a function of PH. From previous work in our laboratory [7,8], it has become clear that irreversibly adsorbed monolayers of FePc, CoPc and CoTAA can be prepared by dipping a pyrolytic graphite (Cp) disc into pyridine solutions of the #~espon~ng chelates. Another result was that the half-wave potential, El,*, for the 0, reduction at CoTAA in 0.5 llri H,SO, was 400 mV more .…”

Section: Oximmentioning

confidence: 99%

Redox potential and electrocatalysis of O2 reduction on transition metal chelates

Putten

Elzing

Visscher

et al. 1987

Journal of Electroanalytical Chemistry and Interfacial Electroc

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The redox potentials of iron phthalocyanine (FePc), cobalt phthalocyanine (CoPc) and cobalt tetraaxaammlene (CoTAA), irreversibly adsorbed on pyrolytic graphite, were investigated as a function of the pH by cyclic voltammetry. The reduction of oxygen was studied under the same conditions with the rotating disc electrode technique. At high pH, where the reduction to H,Or on the cobalt-containing chelates is more reversible, the value of the redox potential is less important. At low pH, where this reduction is irreversible, there is a clear correlation between the redox potential of the central metal ion and the Oa reduction behaviour. In acid media, a 470 mV more positive redox potential of CoTAA compared to that of CoPc, resulted in a half-wave potential, Elfl, for the Or reduction being 400 mV more positive than the El12 of CoPc.

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Cobalt Octaethyltetrapyrazinoporphyrazine: Spectroscopy, and Electrocatalytic and Kinetic Study of Dioxygen Reduction at a Glassy Carbon Electrode

Dong

Liu

Kobayashi

1997

J. Porphyrins Phthalocyanines

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Cobalt octaethyltetrapyrazinoporphyrazine was synthesized and characterized by electronic absorption and magnetic circular dichroism spectroscopy. These spectroscopies and molecular orbital calculations within the framework of the Pariser–Parr–Pople approximation revealed that the effective π-conjugation system of octaethyltetrapyrazinoporphyrazine is smaller than phthalocyanines. For the first time, the electrochemical behaviour of cobalt octaethyltetrapyrazinoporphyrazine irreversibly adsorbed onto a glassy carbon electrode as a surface modifier is reported. The cobalt derivative/glassy carbon electrode showed catalytic activity for oxygen reduction. Surprisingly, the peak potentials for oxygen reduction at this electrode coincide well with those where Co II is reduced to Co I over the whole pH range, indicating that the active species for dioxygen reduction is Co I rather than the Co II species. A possible mechanism for the electrocatalysis of oxygen is discussed.

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The cathodic reduction of oxygen at cobalt phthalocyanine

Cited by 70 publications

References 12 publications

The mechanism of oxygen reduction at iron tetrasulfonato-phthalocyanine incorporated in polypyrrole

The mechanism of oxygen reduction at iron tetrasulfonato-phthalocyanine incorporated in polypyrrole

Redox potential and electrocatalysis of O2 reduction on transition metal chelates

Cobalt Octaethyltetrapyrazinoporphyrazine: Spectroscopy, and Electrocatalytic and Kinetic Study of Dioxygen Reduction at a Glassy Carbon Electrode

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