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Volumn 21, Issue 14, 2009, Pages 3234-3241

Cobalt porphyrin functionalized carbon nanotubes for oxygen reduction

Author keywords

[No Author keywords available]

Indexed keywords

ACIDIC MEDIA; CATALYST LOADINGS; CATALYTIC PERFORMANCE; CATHODE MATERIALS; COBALT PORPHYRINS; DROP-CASTING; ELECTROCATALYTIC; ELECTROCATALYTIC SYSTEM; FOUR-ELECTRON REDUCTION; FUNCTIONALIZATION; FUNCTIONALIZED CARBON NANOTUBES; FUNCTIONALIZED MULTI-WALLED CARBON NANOTUBES; ORDER OF MAGNITUDE; OXYGEN REDUCTION; OXYGEN REDUCTION RATE; PH RANGE; PROTON CONDUCTING MEMBRANE FUEL CELLS; ROOM TEMPERATURE; ROTATING DISK ELECTRODES; ROTATING RING-DISK ELECTRODE; VACUUM DRYING;

EID: 67651149840     PISSN: 08974756     EISSN: None     Source Type: Journal    
DOI: 10.1021/cm900747t     Document Type: Article
Times cited : (134)

References (60)
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    • On the basis of the integration between Co and O atom peaks (Co/ O, 1/134), theCo loading was estimated to be 1Co per 33 functional sites. The Co amount may in fact be greater, considering the possible interference from some oxygen containing contaminants.
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    • The SWNT-Co-porphyrin composition was prepared by using the same reaction condition as for preparing MWNT-Co-porphyrin composition
    • The SWNT-Co-porphyrin composition was prepared by using the same reaction condition as for preparing MWNT-Co-porphyrin composition.
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    • A small shift to less positive potentials was observed in the oxygen reduction after the exposure to sulfuric acid for a prolonged period of time
    • A small shift to less positive potentials was observed in the oxygen reduction after the exposure to sulfuric acid for a prolonged period of time.
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    • The "stability" claimed means the catalytic performance of the MWCNT-Co-porphyrin/Nafion composite is stable and repeatable. It is possible that after a prolonged period of time of exposure to the 1 M H2SO4 solution, the ester bonds in the composite are cleaved via hydrolysis. However, because of the poor solubility of the free Co-porphyrin compounds and their strong noncovalent interactions with MWCNTs, they likely remain in the film and continue to act as the catalytic centers
    • The "stability" claimed means the catalytic performance of the MWCNT-Co-porphyrin/Nafion composite is stable and repeatable. It is possible that after a prolonged period of time of exposure to the 1 M H2SO4 solution, the ester bonds in the composite are cleaved via hydrolysis. However, because of the poor solubility of the free Co-porphyrin compounds and their strong noncovalent interactions with MWCNTs, they likely remain in the film and continue to act as the catalytic centers.
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    • Perchloric acid was used instead of sulfuric acid in our mechanism study for the purpose of comparing the catalytic behavior of our system to other previously reported systems, which were also studied in perchloric acid solution; see refs 23, 25, and 32
    • Perchloric acid was used instead of sulfuric acid in our mechanism study for the purpose of comparing the catalytic behavior of our system to other previously reported systems, which were also studied in perchloric acid solution; see refs 23, 25, and 32.
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    • The mechanism shown in eqs 4 and 5 is a simple illustration, and other possible intermediates during the reduction process are not taken into consideration. There is the possibility of multiple cobalt centers participating in the oxygen reduction. Further studies are in progress to elucidate a detailed mechanism of the reduction process
    • The mechanism shown in eqs 4 and 5 is a simple illustration, and other possible intermediates during the reduction process are not taken into consideration. There is the possibility of multiple cobalt centers participating in the oxygen reduction. Further studies are in progress to elucidate a detailed mechanism of the reduction process.


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