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

*この研究の対応する著者

研究成果: Article査読

131 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)1247-1258
ページ数12
ジャーナルElectrochimica Acta
31
10
DOI
出版ステータスPublished - 1986 1月 1
外部発表はい

ASJC Scopus subject areas

  • 化学工学(全般)
  • 電気化学

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