Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 106, Issue 50, Pages 12993-13001Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp0266087
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Some FeTPP-Cl/carbon electrocatalysts, heat-treated at temperatures up to 800 degreesC, have been studied with cyclic voltammetry, x-ray photoelectron spectroscopy, extended X-ray absorption fine structure, and in situ Mossbauer spectroscopy. It appears that the heat treatment induces considerable site heterogeneity in electronic terms, although structurally the Fe-N4 moiety seems persistent. The data indicate that only part of these Fe-N4 sites contributes to the activity for the electrochemical reduction Of O-2 but that they operate according to the well-known redox mechanism.
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