Gas sensors, which are based on the principle of mixed potentials, have the capability to detemine gas components selectively and sensitively. Above all, the materials used are stable to the exhaust gases of combustion processes. However, practically no commercially available system exists. One possible reason could be that there is no quantitative description of the sensor principle that has been investigated for decades. Therefore, this thesis describes the structure of a FEM model which is able to quantitatively describe the signals of mixed potential sensors. For this purpose, the development of a novel sensor principle is presented. It guarantees reproducible measurements with the help of which a comprehensive understanding of the influencing factors and chains of action of the mixed potential formation can be achieved. An electrochemical characterization of the sensors will also be performed in order to qualitatively validate the mechanisms and to estimate electrochemical parameters. Finally, the model is described in detail and the calculated results are compared with measurement data. The precision of the model also allows further considerations regarding the adsorption kinetics as well as the complex mechanisms in analyte mixtures.
|School:||Universitaet Bayreuth (Germany)|
|Source:||DAI-C 81/5(E), Dissertation Abstracts International|
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