Journal article
Composite Sr- and V-doped LaCrO3/YSZ sensor electrode operating at low oxygen levels
Department of Chemistry, Technical University of Denmark1
Physical and Biophysical Chemistry, Department of Chemistry, Technical University of Denmark2
Department of Energy Conversion and Storage, Technical University of Denmark3
Imaging and Structural Analysis, Department of Energy Conversion and Storage, Technical University of Denmark4
Fundamental Electrochemistry, Department of Energy Conversion and Storage, Technical University of Denmark5
A porous composite electrode of La0.8Sr0.2Cr0.97V0.03O3 -delta (LSCV) and yttria-stabilised zirconia (YSZ) was evaluated as a possible candidate for high-temperature potentiometric oxygen sensor measuring electrodes. The oxygen processes at the electrode were characterised by performing electrochemical impedance spectroscopy (EIS) measurements between 600º C and 900º C at oxygen partial pressures between 4.2x10-6 and 0.2 bar.
The microstructure of the electrode was characterised by electron microscopy. The LSCV/YSZ electrode was porous and coherent with LSCV and YSZ grain sizes between 200 and 400 nm. At oxygen partial pressures around 0.2 bar at 700º C, the oxygen reaction is dominated by solid-state diffusion of oxide ions and surface reaction kinetics.
At oxygen partial pressures around 10-5 bar above 800º C, gas phase mass transport processes dominate the impedance spectra. The relatively low response time at 700º C at an oxygen partial pressure of around 5x10-6 bar and an inlet gas flow rate of 8 L h-1 makes the LSCV/YSZ electrode suitable for use as an potentiometric oxygen sensor electrodes.
| Language: | English |
|---|---|
| Publisher: | Springer-Verlag |
| Year: | 2012 |
| Pages: | 2113-2120 |
| Journal subtitle: | Current Research and Development in Science and Technology |
| ISSN: | 14330768 and 14328488 |
| Types: | Journal article |
| DOI: | 10.1007/s10008-011-1601-7 |
| ORCIDs: | Hansen, Karin Vels and Mogensen, Mogens Bjerg |
