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J. P. Collman, P. Denisevich, Y. Konai, M. Maraocco, C. Koval and F. C. Anson, “Electrode Catalysis of the Four-Electron Reduction of Oxygen to Water by Dicobalt Face-to- Face Porphyrins,” Journal of American Chemistry Society, Vol. 102, No. 19, 1980, pp. 6027-6036.

has been cited by the following article:

• TITLE: Iron and Nitrogen containing Carbon Catalysts with Enhanced Activity for Oxygen Reduction in Proton Exchange Membrane Fuel Cells

  AUTHORS: Chitturi Venkateswara Rao, Lingam Hima Kumar, Balasubramanian Viswanathan

  KEYWORDS: Iron-Based Clusters, Non-Precious Catalysts, Oxygen Reduction, PEM fuel Cells

  JOURNAL NAME: Open Journal of Physical Chemistry, Vol.1 No.1, May 19, 2011

  ABSTRACT: Iron and nitrogen containing carbon catalysts were prepared by the pyrolysis of iron (III) tetramethoxyphenylporphyrin complex adsorbed on as-received as well as nitric acid treated carbon black and employed them as oxygen reduction electrodes for hydrogen-oxygen PEM fuel cells. The influence of carbon surface functional groups on the dispersion of active species and electrocatalytic performance is investigated using electron microscopic and electrochemical techniques. The existence of quinone functional groups on the nitric acid treated carbon was evident from X-ray photoelectron spectroscopy and cyclic voltammetry. Rotating disk electrode voltammetry results affirmed the good electrocatalytic activity and stability of pyrolyzed macrocyclic complex adsorbed on nitric acid treated carbon compared to that of as-received carbon. This is ascribed to the greater number of Fe/N active species as well as good dispersion of metal clusters over nitric acid treated carbon support. Fuel cell tests depicted the comparable performance of pyrolyzed complex adsorbed on nitric acid treated carbon with commercial Pt/C at 353 K. Durability measurements performed under fuel cell operating conditions for 120 h indicate the good stability of the catalysts.