期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 159, 期 4, 页码 B426-B429出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.109204jes
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资金
- DOE LANL [53183-0]
- National Science Foundation [CHE 06-51083]
Oxygen reduction pathway on an unpyrolyzed carbon-supported cobalt oxide nanoparticles-cobalt porphyrin (CoOx-CoP/C) was investigated by rotating disk electrode (RDE) in acidic medium. Koutecky-Levich plots revealed that contrary to carbon-supported cobalt porphyrin (CoP/C), CoOx-CoP/C catalyzes the reduction of oxygen via a 4-electron pathway. Further results showed that the cobalt oxide nanoparticles (CoOx/C) do not catalyze electroreduction of H2O2. The N4-Co center appeared then as the only catalytic active site, dismissing the hypothesis of bifunctional mechanism on CoOx-CoP/C. Interestingly, CoOx-CoP/C exhibits better electrocatalytic properties toward H2O2 reduction than CoP/C, pointing the peculiar role of inactive cobalt oxide nanoparticles. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.109204jes] All rights reserved.
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