| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a reliable and long-life NOx decomposition electrode, and an NOx concentration measuring apparatus. <P>SOLUTION: A detection electrode 42 comprises: a first cermet electrode layer 62 directly formed on a solid electrolyte 12d; and a second cermet electrode 64 formed on the first cermet electrode layer 62. In the first cermet electrode layer 62, the ratio of a Pt-Rh alloy to ZrO<SB>2</SB>is set to the Pt-R alloy : ceramic constituent = 20:80-50:50 in terms of a volume ratio. Conversely, in the second cermet electrode 64, the ratio of the Pt-Rh alloy to ZrO<SB>2</SB>is set to the Pt-Rh alloy : ceramic constituent = 60:40-50:50 in terms of the volume ratio. The occupying ratio of the Pt-Rh alloy in the first cermet electrode layer 62 is equal to ZrO<SB>2</SB>or is lager than ZrO<SB>2</SB>, so that the adhesion force between a solid electrolyte layer 12d and the first cermet electrode layer 62 is enforced, thus solving the problem of peel-off of the detection electrode 42 from the solid electrolyte layer 12d. <P>COPYRIGHT: (C)2004,JPO |
