Transition metal macrocycles supported on high area carbon: Pyrolysis-mass spectrometry studies

Daniel Alberto Scherson, A. A. Tanaka, S. L. Gupta, D. Tryk, C. Fierro, R. Holze, E. B. Yeager, R. P. Lattimer

Research output: Contribution to journalArticle

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Abstract

A number of cobalt and iron porphyrins heat treated at temperatures as low as 400°C exhibit substantial electrocatalytic activity for O2 reduction and reasonable stability in alkaline electrolytes. The effects of this heat treatment on the structure and overall properties of these materials, however, are not well understood. Differential thermogravimetry analyses have shown that in the case of the Co and Fe-μ-oxo forms of tetra methoxyphenyl porphyrin (TMPP) and the metal-free form as well, the onset for partial decomposition occurs at temperatures of about 400-500°C for the macrocycles either as crystals or dispersed on high area Vulcan XC-72. The results obtained with several pyrolysis-mass spectrometric techniques have indicated that the fraction of volatile nitrogen to non-nitrogen containing species generated during the heat treatment is much higher for the metal-free than for the iron-μ-oxo or CoTMPP. Microanalysis also confirms that with the Fe-μ-oxo and CoTMPP part of the nitrogen is retained. Possible models for the nature of the active sites are discussed.

Original languageEnglish
Pages (from-to)1247-1258
Number of pages12
JournalElectrochimica Acta
Volume31
Issue number10
DOIs
Publication statusPublished - 1986 Jan 1
Externally publishedYes

Fingerprint

Porphyrins
Transition metals
Mass spectrometry
Pyrolysis
Nitrogen
Carbon
Iron
Metals
Heat treatment
Microanalysis
Cobalt
Electrolytes
Thermogravimetric analysis
Thermodynamic properties
Decomposition
Temperature
Crystals
Hot Temperature
methoxyphenyl porphyrin

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

Cite this

Scherson, D. A., Tanaka, A. A., Gupta, S. L., Tryk, D., Fierro, C., Holze, R., ... Lattimer, R. P. (1986). Transition metal macrocycles supported on high area carbon: Pyrolysis-mass spectrometry studies. Electrochimica Acta, 31(10), 1247-1258. https://doi.org/10.1016/0013-4686(86)80144-X

Transition metal macrocycles supported on high area carbon : Pyrolysis-mass spectrometry studies. / Scherson, Daniel Alberto; Tanaka, A. A.; Gupta, S. L.; Tryk, D.; Fierro, C.; Holze, R.; Yeager, E. B.; Lattimer, R. P.

In: Electrochimica Acta, Vol. 31, No. 10, 01.01.1986, p. 1247-1258.

Research output: Contribution to journalArticle

Scherson, DA, Tanaka, AA, Gupta, SL, Tryk, D, Fierro, C, Holze, R, Yeager, EB & Lattimer, RP 1986, 'Transition metal macrocycles supported on high area carbon: Pyrolysis-mass spectrometry studies', Electrochimica Acta, vol. 31, no. 10, pp. 1247-1258. https://doi.org/10.1016/0013-4686(86)80144-X
Scherson, Daniel Alberto ; Tanaka, A. A. ; Gupta, S. L. ; Tryk, D. ; Fierro, C. ; Holze, R. ; Yeager, E. B. ; Lattimer, R. P. / Transition metal macrocycles supported on high area carbon : Pyrolysis-mass spectrometry studies. In: Electrochimica Acta. 1986 ; Vol. 31, No. 10. pp. 1247-1258.
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