Limiting current characteristics with regard to oxygen and carbon monoxide in oxidizing and reducing atmospheres

Jong Heun Lee, Hoin Kim, Byung Ki Kim

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The limiting current characteristics with regard to O2 and CO were studied in oxidizing (O2-CO2-N2) and reducing(CO-CO2-N2) atmospheres. The experimental I-V characteristics were compared with a simulation and discussed considering the electrochemical oxidation and decomposition between CO and CO2. The decomposition of CO2 was one of the main O2 sources of oxygen pumping in reducing atmospheres. The limiting current with regard to CO in reducing atmospheres showed a sloped limiting current regime at 700-725°C, while that with regard to O2 in oxidizing atmospheres did not. The sloped limiting current of CO resulted from electrode reactions which were different from those in oxidizing atmospheres, i.e. the CO2 decomposition for the O2 pumping cell and the CO oxidation for the O2 consuming cell.

Original languageEnglish
Pages (from-to)1087-1093
Number of pages7
JournalSolid State Ionics
Volume86-88
Issue numberPART 2
DOIs
Publication statusPublished - 1996 Jul
Externally publishedYes

Keywords

  • Limiting current
  • Oxygen pumping
  • Pt electrode
  • Solid electrolyte

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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