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 language | English |
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Pages (from-to) | 1087-1093 |
Number of pages | 7 |
Journal | Solid State Ionics |
Volume | 86-88 |
Issue number | PART 2 |
DOIs | |
Publication status | Published - 1996 Jul |
Externally published | Yes |
Keywords
- Limiting current
- Oxygen pumping
- Pt electrode
- Solid electrolyte
ASJC Scopus subject areas
- Chemistry(all)
- Materials Science(all)
- Condensed Matter Physics