Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1998-03-23
1999-10-19
Bell, Bruce F.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204421, 422 94, 422 98, G01N 2726
Patent
active
059683309
ABSTRACT:
An electrode material is provided for electrochemical sensors, particularly for sensors detecting combustible gases. For these types of applications, perovskite electrode materials are known which, however, by modification of their oxygen stoichiometry, have a considerable charge carrier mobility. These defects are the causes for an additional, catalytic activity with oxidation processes at electrodes. The measurement of hydrocarbons from combustible gases is thus distorted with electrode materials of this type. These disadvantages are overcome by making such electrode materials from mixed oxides with non-perovskite crystalline structures, which have chemical compositions of one or more of the following general formulas: (A/D).sub.3-y B.sub.x C.sub.5-x O.sub.12.+-..delta., D.sub.1-y B.sub.1-x C.sub.x O.sub.4.+-..delta., D.sub.2-y B.sub.8-x C.sub.x O.sub.16.+-..delta., D.sub.2-y B.sub.1+x C.sub.1-x O.sub.5.+-..delta., or D.sub.2-y B.sub.x C.sub.2-x O.sub.7.+-..delta., wherein A and D are respectively sub-stoichiometrically used cations of the lanthanide series and the alkaline earth metal group, A/D means a cation selected from A, D and mixture thereof, B is a multivalent ion, and C is a redox-stable ion.
REFERENCES:
patent: 4454494 (1984-06-01), Williams et al.
patent: 5015616 (1991-05-01), Sekido et al.
patent: 5616223 (1997-04-01), Shen et al.
patent: 5863503 (1999-01-01), Kudo et al.
Guth Ulrich
Hafele Edelbert
Jakobs Steffen
Bell Bruce F.
Heraeus Electro-Nite International N.V.
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