Mesoporous nanostructured Nb-doped titanium dioxide microsphere catalyst supports for PEM fuel cell electrodes

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DOIResolve DOI: http://doi.org/10.1021/am300002j
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TypeArticle
Journal titleACS Applied Materials and Interfaces
ISSN1944-8244
Volume4
Issue3
Pages17521759; # of pages: 8
SubjectDoped titania; Electroactive; Electrocatalyst support; High specific surface area; High stability; Inorganic components; Ionic interaction; Mass activity; Mesoporous; Mesoporous shell; Microwave methods; Nano-structured; Oxygen reduction reaction; PEM fuel cell; Porosity gradients; Pt particle; Supported Pt; Templating method; TiO; Uniform dispersions; Voltammetric cycles; Cathodes; Cyclic voltammetry; Electrocatalysts; Electrolytic reduction; Mesoporous materials; Microspheres; Platinum; Proton exchange membrane fuel cells (PEMFC); Titanium dioxide
AbstractCrystalline microspheres of Nb-doped TiO 2 with a high specific surface area were synthesized using a templating method exploiting ionic interactions between nascent inorganic components and an ionomer template. The microspheres exhibit a porosity gradient, with a meso-macroporous kernel, and a mesoporous shell. The material has been investigated as cathode electrocatalyst support for polymer electrolyte membrane (PEM) fuel cells. A uniform dispersion of Pt particles on the Nb-doped TiO 2 support was obtained using a microwave method, and the electrochemical properties assessed by cyclic voltammetry. Nb-TiO 2 supported Pt demonstrated very high stability, as after 1000 voltammetric cycles, 85% of the electroactive Pt area remained compared to 47% in the case of commercial Pt on carbon. For the oxygen reduction reaction (ORR), which takes place at the cathode, the highest stability was again obtained with the Nb-doped titania-based material even though the mass activity calculated at 0.9 V vs RHE was slightly lower. The microspherical structured and mesoporous Nb-doped TiO 2 is an alternative support to carbon for PEM fuel cells. © 2012 American Chemical Society.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Fuel Cell Innovation (IFCI-IIPC)
Peer reviewedYes
NPARC number21269276
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Record identifierfdcb8e37-7c4f-4cd4-8545-8048bf9bb858
Record created2013-12-12
Record modified2016-05-09
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