Electrochemical and mössbauer investigations of polymeric iron phthalocyanine oxygen electrodes

✍ Scribed by J. Blomquist; U. Helgeson; L.C. Moberg; L.Y. Johansson; R. Larsson

• Publisher: Elsevier Science
• Year: 1982
• Tongue: English
• Weight: 634 KB
• Volume: 27
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(82)80036-4

✦ Synopsis

Polymeric iron phthalocyanine precipitated on activated carbon has been heated to temperatures in the range ZOO-500°C and the catalytic activity for the electrochemical reduction of oxygen has been investigated. The catalysts were tested in porous, hydrophobic electrodes. Miissbauer spectra have been obtained for thecatalyst powders exposed to different heating temperatures. Heat treatment was found to give electrodes with a higher rate of deactivation for the electrochemical reduction. This was particularly the case for heat treatments at temperatures higher than 300" C. An increase in the intensity of a doublet in the Miissbauer spectra corresponding to oxidized iron was obtained for the heat treated samples. This increase of oxidized iron was found to be correlated to the increased rate of deactivation for the electrodes.