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http://dx.doi.org/10.5369/JSST.2006.15.2.097

Oxygen sensor for the low temperature-measurement using yttria stabilized zirconia(YSZ) electrolyte and Ag electrode  

Yang, Young-Chang (Department of Material Science & Engineering, Korea Advanced Institute of Science & Technology (KAIST))
Park, Chong-Ook (Department of Material Science & Engineering, Korea Advanced Institute of Science & Technology (KAIST))
Publication Information
Journal of Sensor Science and Technology / v.15, no.2, 2006 , pp. 97-101 More about this Journal
Abstract
Silver electrode having a high Electrocatalytic activity is oxygen-permeable electrode, in which oxygen ad-atoms are adsorbed and moved toward YSZ electrolyte by bulk diffusion. It is the different point in comparison to usual porous electrodes, especially platinum, which react with oxygen only in TPBs(Three Phase Boundaries). Also ad-atoms at TPBs of Pt are diffused to YSZ electrolyte by interfacial diffusion mechanism. These properties were used for turning down the operating temperature of YSZ from over $600^{\circ}C$ to below $450^{\circ}C$. The different heat-treatment temperature between a working electrode and a reference electrode suppresses the formation of silver oxides and reduces a volatility of Ag as well. Above all, these own characteristics and special processes of Ag improved a long-term stability of a oxygen sensor.
Keywords
YSZ; permeable electrode; Ag electrode; long-term stability;
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