Electrochemical characterization of unsupported high area platinum dispersed on the surface of a glassy carbon rotating disk electrode in the absence of Nafion® or other additives

Yibo Mo, S. Sarangapani, Anh Le, Daniel Alberto Scherson

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

A method is described herein to immobilize dispersed unsupported high area Pt particles (ca. 30 m2 g-1) on the surface of a glassy carbon (GC) disk of a rotating Pt(ring)/GC(disk) electrode (RRDE) assembly, without the use of Nafion® or other additives, allowing electrochemical measurements to be performed under forced convection with only minimal losses of Pt from the surface. Diffusion limiting currents, Ilim, and half-wave potentials for O2 reduction recorded with dispersed Pt/GC electrodes at the highest attainable loadings (ca. 8.3 equivalent Pt monolayers and rotation rates 400≤ ω ≤2500 rpm, were found to be differ only slightly from those observed with a bulk Pt RDE of the same cross sectional area, e.g. Ilim(Pt) ca. 1.06Ilim(Pt/GC), under otherwise identical conditions. In addition, this novel strategy enables in situ surface modification of dispersed Pt particles on the GC disk of the RRDE by ad-atoms and subsequent voltammetric and electrocatalytic characterization for a wide spectrum of redox reactions.

Original languageEnglish
Pages (from-to)35-38
Number of pages4
JournalJournal of Electroanalytical Chemistry
Volume538-539
DOIs
Publication statusPublished - 2002 Dec 13
Externally publishedYes

Keywords

  • Electrocatalysis
  • Oxygen reduction
  • Platinum
  • Rotating disk electrode
  • Selenium

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

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