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Moos, Ralf ; Zosel, Jens:
Development of solid electrolyte based mixed potential gas sensors in the past 40 years : a journey accompanied by Ulrich Guth.
2025
Veranstaltung: The 20th International Meeting on Chemical Sensors, IMCS 20
, 22.-26. Juni 2025
, Freiburg, Germany.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung
,
Vortrag
)
Abstract
Since the appearance of first publications on mixed potential gas sensors in the late 1970ies, they have been investigated with increasing activity worldwide. Various applications with many measured components were found and many more are still under intensive investigation. The two parts of this contribution highlight milestones in this development and illuminate the scientific contributions of our late colleague Prof. Ulrich Guth to these developments. Shortly after introduction of YSZ-based solid electrolyte sensors into combustion control, the non- Nernstian behavior of silver as an appropriate electrode material was described for the first time. The influence of the catalytic activity of the measuring electrode was discovered and first attempts to create oxygen sensors with catalytically inactive electrodes were reported. The complete description of the signal-establishing electrode reactions and their kinetics by the group of Miura initialized the development of mixed potential solid electrolyte sensors (MPS) with onboard catalyst control as one of the first applications for this sensing principle. At the beginning of the 1990ies, Ulrich Guth and coworkers started to investigate mixed potential gas sensors in Greifswald, Germany and developed methods for intensifying the search for new electrode materials. They were used subsequently and successfully to develop first sensor prototypes for combustion control and catalyst monitoring initially directed on the measurement of hydrocarbons and carbon monoxide. By these results, the applicability of MPS for various examples of stationary and mobile combustion control was demonstrated. Later it became clear that MPS are also suited to measure NOx in the lower ppm-range as an analyte with enhanced environmental importance. At the beginning of the new century, also hydrogen became an analyte of interest for mixed potential gas sensors. Monitoring of dissolved gases in transformer oils is one of the focused applications for this analyte. Beside the most important sensor parameters sensitivity, selectivity, and stability, also the response time was investigated and reduced significantly. Together with improved selectivity for new analytes like acetone, ethanol, or toluene, and a significant reduction of the lower limit of detection, this sensing principle was applied increasingly for breath gas analysis.A relatively new experience revealed that MPS can be used for hydrogen peroxide vapor detection at sub-ppm concentrations, allowing to develop sensors to monitor traces of this vapor as the leading sterilization chemical in pharmaceutical production. In the past years, Ulrich Guth and his scientific descendants worked on dynamical methods. One approach for YSZ-based MPS uses a so-called pulsed-polarization principle, especially for NOx sensors. Here, the NOx concentration-dependent decline of the depolarization current after a short polarization pulse serves as a base for a very selective sensor device. Furthermore, cyclic voltammetry and square wave voltammetry were investigated for the detection of H2, CO, and HC. It could be shown that these techniques also provide significantly improved selectivity of YSZ-based sensors. It should be noted that Ulrich Guth also exported ideas of him to the scientific community. It was he who always recommended the direct electrochemical reduction of CO2 to valuable raw products, which ultimately led to a major research focus in Germany.
Weitere Angaben
| Publikationsform: | Veranstaltungsbeitrag (Vortrag) |
|---|---|
| Begutachteter Beitrag: | Ja |
| Institutionen der Universität: | Fakultäten > Fakultät für Ingenieurwissenschaften Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Funktionsmaterialien > Lehrstuhl Funktionsmaterialien - Univ.-Prof. Dr.-Ing. Ralf Moos Profilfelder > Advanced Fields > Neue Materialien Forschungseinrichtungen > Zentrale wissenschaftliche Einrichtungen > Bayreuther Materialzentrum - BayMAT |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften |
| Eingestellt am: | 11 Aug 2025 07:10 |
| Letzte Änderung: | 11 Aug 2025 07:10 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/94447 |