Oxygen reduction reaction activity and electrochemical stability of thin-film bilayer systems of platinum on niobium oxide

Download
  1. (PDF, 653 KB)
  2. Get@NRC: Oxygen reduction reaction activity and electrochemical stability of thin-film bilayer systems of platinum on niobium oxide (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1021/jp104306j
AuthorSearch for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for:
TypeArticle
Journal titleThe journal of physical chemistry. C, Nanomaterials and interfaces
Volume114
Issue39
Pages1646316474; # of pages: 12
AbstractWe used electrochemical testing and theoretical calculations based on density functional theory (DFT) to examine the oxygen reduction reaction (ORR) activity of platinum electrocatalyst supported on several forms of niobium oxide. Bilayer electrocatalysts were synthesized in the form of 5 nm thick Pt layers (ca. 0.01 mg/cm2), deposited on 5 or 10 nm thick niobium oxide and backed by glassy carbon (GC) electrodes. The NbO and NbO2 supports enhance the specific electrochemical activity of Pt relative to the identically synthesized baseline system of Pt on GC but have no positive effect on the mass activity. The electrochemical stability of the Pt/NbO2 bilayer system was investigated by potential cycling with up to 2500 cyclic voltammetry (CV) cycles. After 2500 cycles, data indicates minimal electrochemical area loss. With the use of DFT calculations, we have evaluated effects of oxygen incorporation on stability, electronic structure, and electrochemical activity of Pt|NbxOy systems. Calculations predict a transfer of electronic charge density from Nb, NbO, and NbO2 to Pt and a reverse case for Nb2O5. However, the experimental ORR activity does not follow the trends predicted by the d-band model.
Publication date
LanguageEnglish
AffiliationNRC Institute for Fuel Cell Innovation; National Research Council Canada; National Institute for Nanotechnology
Peer reviewedYes
NPARC number16907880
Export citationExport as RIS
Report a correctionReport a correction
Record identifieraf7f4c9a-daa7-4ca4-bf5e-4795e8f31e04
Record created2011-02-22
Record modified2016-05-09
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)