Electrode material

US5968330A · kind A · utility

Assignee

• Heraeus Electro-Nite International N.V. · BE

Inventors

• Ulrich Guth · Greifswald, DE
• Steffen Jakobs · Neuenkirchen, DE
• Edelbert Hafele · Karlsruhe, DE

Key dates

• Filing date: Mar 23, 1998
• Grant date: Oct 19, 1999
• Expiry date: Mar 23, 2018

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N27/4075
• WIPO field: Measurement
• WIPO sector: Instruments

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…