NOx DECOMPOSITION ELECTRODE, AND NOx CONCENTRATION MEASURING APPARATUS

Japanese Patent JP2003322634

A

To provide a reliable and long-life NOx decomposition electrode, and an NOx concentration measuring apparatus.

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 ZrO2 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 ZrO2 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 ZrO2 or is lager than ZrO2, 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.

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NAKAGAKI KUNIHIKO
RI SOSAI
NAKASONE OSAMU
SUZUKI HIDEYUKI

JP2002127383A

November 14, 2003

April 26, 2002

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NGK INSULATORS LTD

B01D53/32; G01N27/416; G01N27/419; G01N33/00; (IPC1-7): G01N27/416; G01N27/419

JPH11183434A	1999-07-09
JPS63266352A	1988-11-02
JP2000171436A	2000-06-23
JP2002236107A	2002-08-23
JPH1172476A	1999-03-16
JP2003322636A	2003-11-14
JP2000028576A	2000-01-28
JP2002195978A	2002-07-10
JP2002162382A	2002-06-07
JP2002162383A	2002-06-07

Takehiro Chiba (1 outside)

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