Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1993-12-27
1996-01-02
Tung, T.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204424, 204426, G01N 2741, G01N 27409
Patent
active
054805350
ABSTRACT:
A thin film mutilayered air-fuel ratio sensor having a sensor element including a first electrode formed on a porous substrate, a first solid electrolyte and a third electrode formed on the first electrode in this order, in such a manner that the first electrode is completely covered by the first solid electrolyte inclusive of its surroundings, and that the first solid electrolyte is completely covered by the third electrode inclusive of its surroundings, a second solid electrolyte and a fourth electrode and formed on the third electrode in this order, in such a manner that the peripheral portion of the third electrode is left uncovered by the second solid electrolyte and the fourth electrode and thereby left exposed. The first electrode, the third electrode, and the fourth electrode are made of a gas-permeable porous platinum, and the first solid electrolyte and the second solid electrolyte are made of a gas-permeable dense solid electrolyte having oxygen ion conductivity. The sensor has far improved performance as compared to the conventional ones and can be made compact.
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Kondo Haruyoshi
Saji Keiichi
Satta Kozo
Takahashi Hideaki
Takeuchi Masaharu
Kabushiki Kaisha Toyota Chuo Kenkyusho
Tung T.
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