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Nafion induced surface confinement of oxygen in carbon-supported oxygen reduction catalysts

Journal Article · · Journal of Physical Chemistry. C
We studied the surface confinement of oxygen inside layers of Nafion self-assembled on carbon-supported oxygen reduction reaction (ORR) catalysts. It is demonstrated that oxygen accumulates in the hydrophobic component of the polymer remaining in contact with the carbon surface. Furthermore, the amount of surface confined oxygen increases with the degree of carbon surface graphitization, which promotes the self-assembly of the polymer. Planar macrocyclic ORR catalysts possessing a delocalized system of π electrons such as Co and Fe porphyrins and phthalocyanines have virtually no effect on the surface confinement of oxygen, in accordance with their structural similarity to graphitic carbon surfaces where they adsorb. Platinum particles in carbon-supported ORR catalysts with high metal contents (20%) disrupt the self-assembly of Nafion and virtually eliminate the oxygen confinement, but the phenomenon is still observed for low Pt loading (4.8%) catalysts.
Research Organization:
Los Alamos National Laboratory (LANL)
Sponsoring Organization:
USDOE; University of California Office of the President
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1334132
Report Number(s):
LA-UR-15-27304
Journal Information:
Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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