Application of a composite structure of carbon nanoparticles and Nb–TiO2 nanofibers as electrocatalyst support for PEM fuel cells

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DOIResolve DOI: http://doi.org/10.1016/j.jpowsour.2012.02.093
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TypeArticle
Journal titleJournal of Power Sources
ISSN0378-7753
Volume210
Pages1520
SubjectFuel cells; Conductive ceramics; Catalyst support; Nanofibers; Doped titanium oxide
AbstractPlatinum catalyst nanoparticles (20 wt.%) were deposited on a mixed support, which consisted of 25 at.% Nb doped TiO2 nanofibers and carbon agglomerates. XRD analysis revealed that titania was present in the rutile phase. The catalyst was characterized electrochemically with respect to durability and oxygen reduction activity. Based on cyclic voltammetry tests, the Nb–TiO2/C supported catalyst was more stable compared to a commercially available carbon supported Pt catalyst (E-tek) over 1000 cycles. The apparent active Pt area decreased by 5% due to cycling, whereas in the case of Pt/C the decrease was 23%. The oxygen reduction performance was comparable for both cases. For example, during the anodic sweep the mass activity at 0.9 V vs. the reversible hydrogen electrode (RHE) was 19 A gPt−¹ and 20 A gPt−¹ for the freshly prepared in-house prepared and commercial catalysts, respectively. After the durability experiment both types of catalysts yielded a mass activity of 17 A gPt−¹. Fuel cell tests with a single cell configuration were also carried out with the Nb–TiO2/C supported catalyst on the cathode side (gas diffusion electrode), yielding a peak power density of 0.34 W cm−² at 75 °C when pure oxygen was supplied on the cathode side.
Publication date
LanguageEnglish
AffiliationEnergy, Mining and Environment; National Research Council Canada
Peer reviewedYes
IdentifierS0378775312005150
NPARC number21268800
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Record identifierf8cc491b-ed3c-45e7-b5d6-11b8570d35d7
Record created2013-11-13
Record modified2016-05-09
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