D. Scherson, S. Gupta, C. Fierro
Sep 1, 1983
Citations
0
Influential Citations
128
Citations
Quality indicators
Journal
Electrochimica Acta
Abstract
Abstract Cobalt tetramethoxyphenyl porphyrin (Co-TMPP) on a high area carbon support after thermal treatment at 450–900°C has been found to be an effective catalyst for O2 reduction in alkaline electrolytes. The effect of the heat treatment at 850°C on this catalyst has been examine with emission Mossbauer spectroscopy using Co-57 enriched Co-TMPP. The spectra indicate the presence of cobaltous oxides with no evidence of Co-N4 centers or any other form of cobalt. The metal-free complex H2TMPP, given similar thermal treatment on a mineral-free carbon support does not show catalytic activity beyond that of the carbon support, thus confirming the importance of the transition metal to the catalysis.