(19)
(11) EP 1 359 412 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION

(48) Corrigendum issued on:
17.03.2004 Bulletin 2004/12

(43) Date of publication:
05.11.2003 Bulletin 2003/45

(21) Application number: 03252626.1

(22) Date of filing: 25.04.2003
(51) International Patent Classification (IPC)7: G01N 27/407
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
Designated Extension States:
AL LT LV MK

(30) Priority: 26.04.2002 JP 2002127435

(71) Applicant: NGK INSULATORS, LTD.
Nagoya-City, Aichi Prefecture 467-8530 (JP)

(72) Inventors:
  • Nakagaki, Kunihiko, NGK Insulators, Ltd.
    Nagoya-shi, Aichi-ken, 467-8530 (JP)
  • Suzuki, Hideyuki, NGK Insulators, Ltd.
    Nagoya-shi, Aichi-ken, 467-8530 (JP)
  • Lee, Sang Jae, NGK Insulators, Ltd.
    Nagoya-shi, Aichi-ken, 467-8530 (JP)
  • Nakasone Osamu, NGK Insulators, Ltd.
    Nagoya-shi, Aichi-ken, 467-8530 (JP)

(74) Representative: Paget, Hugh Charles Edward et al
MEWBURN ELLIS York House 23 Kingsway
London WC2B 6HP
London WC2B 6HP (GB)

   


(54) NOx-decomposing electrode and NOx concentration-measuring apparatus


(57) A detecting electrode (42) comprises a first cermet electrode layer (62) formed directly on a solid electrolyte layer (12d) and a second cermet electrode layer (64) formed on the first cermet electrode layer (62). The ratio between Pt and Rh in the first cermet electrode layer (62) ranges from 100:0 to 25:75 by weight. The ratio between Pt and Rh in the second cermet electrode layer (64) ranges from 25:75 to 0:100 by weight.