High-temperature hydrogen sensor based on stabilized zirconia and metal oxide electrode

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:441264

Lu, Geyu; Miura, Norio; Yamazoe, Noboru ^[1]

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1. Kyushu Univ., Fukuoka (Japan)

It has been reported that stabilized-zirconia oxygen sensors sometimes give non-Nernstian response when oxidizable gases, such as CO and H{sub 2}, coexist with O{sub 2}. Such behavior is usually observed at low temperature below 400{degrees}C when Pt is used as a sensing electrode, and the sensing electrode potential involved is mixed potential. Recently, it was found that a small amount of H{sub 2}S or NO{sub x} existing in air could be detected by a zirconia-based sensor attached with an oxide electrode, such as WO{sub 3} or CdMn{sub 2}O{sub 4}, through mechanisms involving mixed potential. These results suggest the importance of oxide electrodes for the mixed-potential type gas sensors. On this background, the authors have carried out a search for the electrode oxides adequate for detecting oxidizable gases at high temperature. As a result, ZnO was found to work as an excellent electrode for selective H{sub 2} monitoring, as described below.

• OSTI ID: 441264
• Report Number(s): CONF-960782--
• Country of Publication: United States
• Language: English

Related Subjects

44 INSTRUMENTATION
INCLUDING NUCLEAR AND PARTICLE DETECTORS
DESIGN
HYDROGEN
MEASURING INSTRUMENTS
MONITORING
PERFORMANCE
ZINC OXIDES
ZIRCONIUM OXIDES