Synthesis and characterization of carbon-supported transition metal oxide nanoparticles — Cobalt porphyrin as catalysts for electroreduction of oxygen in acids
作者： Stephanie N.S. Goubert-Renaudin , Xiuling Zhu , Andrzej Wieckowski
DOI: 10.1016/J.ELECOM.2010.06.004
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摘要: Abstract Unpyrolyzed, non noble metal catalysts for Oxygen Reduction Reaction (ORR), denoted MeOx–CoP/C, were obtained using a two-step procedure. The procedure consisted of synthesis carbon-supported transition (Me═Co, or Ni, Fe) nanoparticles, followed by adsorption cobalt porphyrin (CoP). TEM and XPS analyses confirm the formation nanoparticles presence oxides. Rotating disk electrode measurements showed that as-synthesized materials exhibit catalytic ORR activity in acidic medium toward oxygen reduction, which is higher than on carbon. This reveals oxide enhance metalloporphyrin without being electroactive themselves. follows sequence: CoOx–CoP/C > NiOx–CoP/C > FeOx–CoP/C, showing influence nature enhancing effect. center incorporated macrocycle was found to be essential reduction reaction, appearing thus active site reaction. Our data suggest occurs at single site.
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