Oxygen reduction on a high-surface area Pt/Vulcan carbon catalyst: A thin-film rotating ring-disk electrode study

U. A. Paulus, T. J. Schmidt, H. A. Gasteiger, R. J. Behm

Research output: Contribution to journalArticlepeer-review

1442 Scopus citations

Abstract

We describe the adaptation of the recently developed thin-film rotating disk electrode method and its application in a rotating ring disk configuration (RRDE) to the investigation of the oxygen reduction reaction (orr) on a supported catalyst powder (Pt/Vulcan XC 72 carbon). This allows the determination of kinetic data, such as reaction orders or apparent activation energies, for the orr directly without mathematical modeling. Collection experiments reveal a potential and rotation rate independent collection efficiency. RRDE measurements allow, for the first time, the direct determination of the fraction of peroxide production during oxygen reduction on supported catalysts. Finally, comparison of measurements in 0.5 M H2SO4 and 0.5 M HClO4, respectively, reveals a significant effect of (bi)sulfate adsorption on the orr activity. On the basis of the present results, predictions are made on the kinetic limit of the orr in polymer electrolyte fuel cells, in the absence of ohmic and mass transport resistances at 100% utilization.

Original languageEnglish
Pages (from-to)134-145
Number of pages12
JournalJournal of Electroanalytical Chemistry
Volume495
Issue number2
DOIs
StatePublished - 5 Jan 2001
Externally publishedYes

Keywords

  • Oxygen reduction
  • Platinum
  • Rotating ring-disk electrode

Fingerprint

Dive into the research topics of 'Oxygen reduction on a high-surface area Pt/Vulcan carbon catalyst: A thin-film rotating ring-disk electrode study'. Together they form a unique fingerprint.

Cite this