Journal
ELECTROCHIMICA ACTA
Volume 77, Issue -, Pages 225-231Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2012.05.100
Keywords
Doped-TiO2; Thermal hydrolysis; Hybrid support; Oxygen reduction mass activity; Durability of supports; TiO2 anatase-to-rutile transition; PEM fuel cell
Categories
Funding
- Institute for fuel cell innovation, National Research Council of Canada
- Ballard Power Systems
- Automotive Fuel Cell Cooperation (AFCC)
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The composite supports, (Nb0.07Ti0.93O2)(25wt%)-C-75wt% and (Nb0.07Ti0.93O2)(70wt%)-C-30wt%, as well as their supported Pt-Pd alloy electrocatalysts, 20 wt%Pt0.62Pd0.38/((Nb0.07Ti0.93O2)(25wt%)-C-75wt%)(80wt%) and 20 wt%Pt0.62Pd0.38/((Nb0.07Ti0.93O2)(70wt%)-C-30wt%)(80wt%) for oxygen reduction reaction (ORR), are synthesized, respectively, using an acid-water based solution as solvent. The effects of three factors, namely concentration of HCl, the ratio of titanium precursor to solvent, and the ratio of metal-oxide to carbon in the composite support, on the TiO2 anatase-to-rutile transition are investigated in an effort to optimize the supports and their supported catalysts with respect to both ORR catalytic activity and durability. Based on both the high ORR activity and durability, these catalysts should be feasible if used in PEM fuel cells as cathode electrocatalysts. Crown Copyright (C) 2012 Published by Elsevier Ltd. All rights reserved.
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