Improved stability of mesoporous carbon fuel cell catalyst support through incorporation of TiO2

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DOIResolve DOI: http://doi.org/10.1016/j.electacta.2010.07.025
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TypeArticle
Journal titleElectrochimica Acta
Volume55
Issue28
Pages83658370; # of pages: 6
SubjectMesoporous carbon; Fuel cells; Platinum; Durability; Titanium dioxide
AbstractThe electrochemical stability of Pt deposited on mesoporous carbon, which was either applied in its unmodified state or coated with 20 wt% TiO2, was investigated by cyclic voltammetry in N2 purged 0.5M sulfuric acid. XRD analysis revealed that TiO2 was present in the anatase phase. The mean Pt particle diameter was ?6 and ?4 nm for mesoporous carbon with and without TiO2, respectively. Pt supported on TiO2 modified substrates was more stable than Pt supported on conventional mesoporous carbon when subjected to 1000 cycles in the potential range from 0.05 to 1.25V vs. RHE. This was evident from the observation that the support with TiO2 retained ?53% of the electrochemically active surface area relative to the state observed after 100 cycles, whereas ?33% of the active area remained in the case without TiO2. The oxygen reduction mass activity was identical for both fresh samples (i.e., 18AgPt?1). After 1000 cycles the mass activity decreased to 10AgPt?1for the case without TiO2, whereas with TiO2 the deactivation was minor; i.e., the mass activity after 1000 cycles was 17AgPt-1.
Publication date
LanguageEnglish
AffiliationNRC Institute for Fuel Cell Innovation; National Research Council Canada
Peer reviewedYes
NPARC number16925473
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Record identifiereec17676-5911-40df-92a6-349536c5ab65
Record created2011-02-25
Record modified2016-05-09
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