Electrochemical sensor for determining the oxygen concentration in gas mixtures
First Claim
1. A sensor for determining the oxygen concentration in gas mixtures, having a solid electrolyte, with oxygen ionic conductivity, which has a measuring electrode that does not catalyze establishment of equilibrium of the gas mixture and is exposed to the gas mixture, wherein there is added to a platinum-containing measuring electrode (11) a material which is capable of inhibiting the catalytic action of the measuring electrode (11), in such a way that it is possible to set up at the measuring electrode (11) a potential which at least approximately corresponds to the free oxygen content.
1 Assignment
0 Petitions
Accused Products
Abstract
An electrochemical sensor for determining the oxygen concentration in gas mixtures is proposed. The sensor has a solid electrolyte (10) with oxygen ionic conductivity, which has a measuring electrode (11) that does not catalyze establishment of equilibrium of the gas mixture and is exposed to the gas mixture. The measuring electrode (11) contains platinum and bismuth. The effect of these materials is that the free oxygen contained in the gas mixture is preferentially adsorbed, without reacting with the other gas components such as CO and HC.
143 Citations
14 Claims
- 1. A sensor for determining the oxygen concentration in gas mixtures, having a solid electrolyte, with oxygen ionic conductivity, which has a measuring electrode that does not catalyze establishment of equilibrium of the gas mixture and is exposed to the gas mixture, wherein there is added to a platinum-containing measuring electrode (11) a material which is capable of inhibiting the catalytic action of the measuring electrode (11), in such a way that it is possible to set up at the measuring electrode (11) a potential which at least approximately corresponds to the free oxygen content.
Specification