Lakhmi, R.; Viricelle, J.-P.; Alrammouz, R.; Rieu, M. From the Modeling of an Electrochemical YSZ-Based Gas Sensor Used in Electrolysis Mode. Sensors2024, 24, 658.
Lakhmi, R.; Viricelle, J.-P.; Alrammouz, R.; Rieu, M. From the Modeling of an Electrochemical YSZ-Based Gas Sensor Used in Electrolysis Mode. Sensors 2024, 24, 658.
Lakhmi, R.; Viricelle, J.-P.; Alrammouz, R.; Rieu, M. From the Modeling of an Electrochemical YSZ-Based Gas Sensor Used in Electrolysis Mode. Sensors2024, 24, 658.
Lakhmi, R.; Viricelle, J.-P.; Alrammouz, R.; Rieu, M. From the Modeling of an Electrochemical YSZ-Based Gas Sensor Used in Electrolysis Mode. Sensors 2024, 24, 658.
Abstract
Electrochemical sensors have been used for many decades. Yet, modeling of such sensors used in electrolysis mode is poorly documented, especially in the case parallel action of multiple gases. Those ones are of great interest since they constitute the first brick to bring information on natures and concentrations of a gaseous mixture composition thanks to grey box modeling of sensors array for example. Based on Butler Volmer’s equations, a model assuming parallel reactions at gold cathode has been introduced in this article and confronted to experimental results. Establishment of the model is based on the extraction of 3 variables: the charge transfer coefficient “α”, the reaction order γ, and the reaction constant rate k0. Tests performed without pollutants and with different concentrations of oxygen could be nicely fitted by the model. Then, the influence of polarization current on the 3 variables of the model has been evaluated showing a clear influence on the constant rate and the reaction order. Also, increasing the polarization current enabled us to get selectivity to oxidant gases. Similarly, the effect of the oxygen concentration was evaluated. Results showed that, in this case, the charge transfer coefficients “α” obtained for oxidant gases is quite different that the ones obtained in the polarization current varying conditions. Therefore, the model will be interesting in situations where polarization current and oxygen content are not varied together. Variation of polarization current can be quite interesting to get increased information for multivariate analysis purpose in constant oxygen content situations. Besides, other parameters have are required for applications in which the oxygen content is bound to change like exhaust gases or combustion.
Copyright:
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