Progress in mixed-potential type devices based on solid electrolyte for sensing redox gases

Gas sensors based on solid electrolytes have been explored extensively in r ecent years, especially from growing concerns to environmental issues. Amon g the Various solid electrolyte sensors, the group of devices based on the mixed-potential gas-sensing principle has been paid special attention due t o its attractive performances as well as unique working mechanism. These de vices, if designed properly, can exhibit high sensitivity and selectivity t o redox gases in oxygen containing atmospheres even at high temperature, sh owing promise of being applied for combustion exhaust monitoring. This arti cle aims at over-viewing recent progress in the mixed-potential type gas se nsors. Particular attention is focused on our original work about the zirco nia-based sensors using oxide electrodes for detecting various gases such a s H-2, CO and NOx at high temperatures. (C) 2000 Elsevier Science B.V. All rights reserved.