PT and PTCO electrocatalysts prepared by mechanical alloying and metal organic chemical vapour deposition for the oxygen reduction reaction in alkaline media

M. A. García-Contreras, S. M. Fernández-Valverde, J. R. Vargas-García

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Pt and Pt-Co (70-30) Electrocatalysts were obtained by Mechanical alloying (MA) of Pt and cobalt powders. They also were prepared as thin films on glassy carbon by chemical vapour deposition CVD of metal organic precursors of Pt and Co. The MA electrocatalysts consisted of agglomerated particles constituted of 20-25 nm crystallites. The CVD films had about 250 nm of thickness and the particles size was about 30 nm for Pt particles and 19 nm for Pt-Co particles. Some iron was determined by EDX 0.9% in Pt and 3.1% in Pt-Co for the samples prepared by MA. Tafel plots were performed for the elecrocatalysts obtained by both techniques, and the kinetic parameters for the ORR were determined. The results showed that PtCo alloys obtained by both techniques have higher exchange current densities than Pt prepared in the same conditions. The difference is higher for the materials prepared by MA. The Koutecky-Levich plots were compared with 2 and 4 electron pathways for the ORR: The MA and CVD obtained electrocatalysts showed a 4 electron transfer for the ORR.

Original languageEnglish
Title of host publication17th World Hydrogen Energy Conference 2008, WHEC 2008
Pages874-878
Number of pages5
StatePublished - 2008
Event17th World Hydrogen Energy Conference 2008, WHEC 2008 - Brisbane, QLD, Australia
Duration: 15 Jun 200819 Jun 2008

Publication series

Name17th World Hydrogen Energy Conference 2008, WHEC 2008
Volume2

Conference

Conference17th World Hydrogen Energy Conference 2008, WHEC 2008
Country/TerritoryAustralia
CityBrisbane, QLD
Period15/06/0819/06/08

Keywords

  • Chemical vapour deposition
  • Electrocatalysts
  • Mechanical alloying
  • Oxygen reduction reaction

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