Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 9, Issue 9, Pages 2256-2260Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2007.06.027
Keywords
polymer electrolyte membrane fuel cell; cathode electrocatalyst; oxygen reduction; oxide support; TiO2
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The Nb-doped TiO2 nanostructure (Nb-TiO2) was prepared as a support of metal catalyst in polymer electrolyte membrane fuel cells. Using the Nb-TiO2 nanostructure support, we prepared the Nb-TiO2 supported catalyst. The Nb-TiO2 supported Pt catalyst (Pt/NbTiO2) showed the well dispersion of Pt catalysts (similar to 3 nm) on the Nb-TiO2 nanostructure supports (similar to 10 nm). The Pt/Nb-TiO2 showed an excellent catalytic activity for oxygen reduction compared with carbon supported Pt cathode catalyst. The enhanced catalytic activity of Pt/Nb-TiO2 in electrochemical half cell measurement may be mainly due to well dispersion of Pt nanoparticles on Nb-TiO2 nanosized supports. In addition, from XANES spectra of Pt L edge obtained with the supported catalysts, the improved catalytic activity of Pt/Nb-TiO2 for oxygen reduction may be caused by an interaction between oxide support and metal catalyst. (c) 2007 Published by Elsevier B.V.
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