The development of new microelectrode gas sensors: an odyssey. Part 1. O2 and CO2 reduction at unshielded gold microdisc electrodes

C. E.W. Hahn, H. McPeak, A. M. Bond, D. Clark

Research output: Contribution to journalArticleResearchpeer-review

39 Citations (Scopus)

Abstract

In this paper we describe the reduction of O2 and CO2, when both molecules are always present and the balance gas is N2, at unshielded gold microdisc electrodes in dimethyl sulphoxide (DMSO) in a standard reaction cell. We show that both gases can be reduced in the presence of each other, in the range 3-15 vol.% CO2 and 10-30 vol.% O2, with minimal cross-interference from "feedforward" and "feedback" reaction products from the individual O2 and CO2 reduction processes. Well-separated O2 and CO2 reduction processes were obtained with gold microdisc electrodes when the polarizing voltage was swept typically at 0.1-0.5 V s-1, and steady state limiting currents were measured which were proportional to the O2 and CO2 concentrations.

Original languageEnglish
Pages (from-to)61-68
Number of pages8
JournalJournal of Electroanalytical Chemistry
Volume393
Issue number1-2
DOIs
Publication statusPublished - 15 Aug 1995
Externally publishedYes

Keywords

  • Carbon dioxide
  • Electroreduction
  • Gold microdisc electrodes
  • Microelectrode gas sensors
  • Oxygen

Cite this