Synthesis of Pd and Nb-doped TiO 2 composite supports and their corresponding Pt-Pd alloy catalysts by a two-step procedure for the oxygen reduction reaction

Download
  1. Get@NRC: Synthesis of Pd and Nb-doped TiO 2 composite supports and their corresponding Pt-Pd alloy catalysts by a two-step procedure for the oxygen reduction reaction (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1016/j.jpowsour.2012.08.025
AuthorSearch for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for:
TypeArticle
Journal titleJournal of Power Sources
ISSN0378-7753
Volume221
Pages232241; # of pages: 10
SubjectClusters; Composite support; Mass activity; Oxygen reduction reaction; PEM fuel cell; Alloys; Catalyst activity; Catalyst supports; Electric conductivity; Electrocatalysts; Electrolytic reduction; Niobium; Platinum; Platinum compounds; Proton exchange membrane fuel cells (PEMFC); Rotating disks; Titanium dioxide; Platinum alloys
AbstractSeveral Pd-composite Nb 0.06Ti 0.94O 2 materials are synthesized by a two-step procedure, and employed as the Pt-Pd alloy catalyst support for the PEM fuel cell oxygen reduction reaction (ORR). These supports and their supported catalysts are characterized using analytical and electrochemical methods with respect to their material morphology, chemical/electrochemical stability, electronic conductivity as well as oxygen reduction reaction (ORR) mass activity/stability. For the supported Pt-Pd catalysts, the Pt-Pd nanoparticles adhered to both the Nb 0.06Ti 0.94O 2 and composited Pd surfaces to form Pt mPd n clusters. A possible synergetic interaction between the Pt-Pd alloy catalyst and its Pd-Nb 0.06Ti 0.94O 2 composite support is believed to exist which enhances the ORR activity of these catalysts. The electronic conductivity of Nb 0.06Ti 0.94O 2 can be greatly improved after forming composites with Pd to the desired levels required for electrocatalyst applications. Three supported Pt-Pd catalysts, 20 wt% Pt 0.62Pd 0.38/Pd 10wt%-(Nb 0.06Ti 0.94O 2) 90wt%, 20 wt% Pt 0.62Pd 0.38/Pd 30wt%-(Nb 0.06Ti 0.94O 2) 70wt%, and 20 wt% Pt 0.62Pd 0.38/Pd 50wt%-(Nb 0.06Ti 0.94O 2) 50wt%, are synthesized and tested using both cyclic voltammetric and rotating disk electrode techniques with respect to their surface electrochemistry, ORR mass activity, and electrochemical stability. All three catalysts show higher Pt mass activity (>130 mA mg Pt -1 at 0.9 V vs. RHE) than that of the baseline 47 wt% Pt C -1 carbon supported catalyst (110 mA mg Pt -1). However, the durability of these catalysts needs to be further improved.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Fuel Cell Innovation (IFCI-IIPC)
Peer reviewedYes
NPARC number21269703
Export citationExport as RIS
Report a correctionReport a correction
Record identifierf94f32e5-8eb5-4313-9e81-2c09f331e295
Record created2013-12-13
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)
Date modified: