Characterization of Pt,O2|YSZ electrodes for lambda probes and their ageing in humid atmosphere
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Elke Flegel
Elke Flegel studied Materials Science at the University of Stuttgart and the Technical University of Darmstadt. Currently, she is a PhD student at TU Dresden in collaboration with Robert Bosch GmbH on the topic of Pt,O2|YSZ electrodes.
Robert Bosch GmbH, Wernerstr. 51, 70469 Stuttgart, Germany
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Corinna Vonau
Corinna Vonau studied Chemistry at the University of Leipzig. She wrote her PhD thesis in collaboration with the Robert Bosch GmbH and the University of Dresden. Currently, she is working at Bosch in the field of advanced engineering of exhaust gas sensors.
Robert Bosch GmbH, Wernerstr. 51, 70469 Stuttgart, Germany
Ulrich Guth received his PhD from the University of Greifswald in 1975. In 1993 he became a professor for solid state chemistry at the University of Greifswald. From 1999 to 2010 he had been working as the director of the Meinsberg Kurt-Schwabe Research Institute and as a professor for physical chemistry especially sensor and measuring technology at the Dresden University of Technology. His principal research interests are directed towards solid electrolyte sensors and new materials for these high temperature sensors.
Technische Universität Dresden, FB Chemie und Lebensmittelchemie, 01062 Dresden, Germany
Abstract
Electrodes with different microstructures made of platinum and yttria stabilized zirconia (YSZ) were investigated. They were characterized by means of impedance measurements and electrode charging experiments in the temperature range of 450 ℃ to 800 ℃ and in oxygen partial pressures of 0.2 bar down to 10−5 bar. Samples were characterized before and after an ageing step at 690 ℃ in water vapour containing atmosphere. Microstructural data were determined by a 3D microstructure reconstruction from SEM image stacks. Results indicate that a large platinum surface or a high triple phase boundary (TPB) density both lead to a lower electrode impedance and stabilize the electrode against degradation in humid atmosphere.
Zusammenfassung
Elektroden mit verschiedenen Mikrostrukturen aus Platin und mit Yttriumoxid stabilisiertem Zirkonoxid (YSZ) wurden untersucht. Diese wurden mittels Impedanzmessungen und Aufladung der Elektroden im Temperaturbereich zwischen 450 ℃ und 800 ℃ sowie unter Sauerstoffpartialdrücken von 0,2 bar bis 10−5 bar vor und nach einer Alterung in wasserdampfhaltiger Atmosphäre bei 690 ℃ charakterisiert. Mikrostrukturinformationen wurden mit Hilfe der 3D-Gefügerekonstruktion aus REM-Bilderstapeln gewonnen. Die Ergebnisse deuten darauf hin, dass sowohl eine große Platinoberfläche als auch eine hohe Dreiphasengrenzendichte zu einer geringeren Elektrodenimpedanz führen und die Elektrode gegen Degradation in feuchter Atmosphäre schützen.
About the authors
Elke Flegel studied Materials Science at the University of Stuttgart and the Technical University of Darmstadt. Currently, she is a PhD student at TU Dresden in collaboration with Robert Bosch GmbH on the topic of Pt,O2|YSZ electrodes.
Robert Bosch GmbH, Wernerstr. 51, 70469 Stuttgart, Germany
Corinna Vonau studied Chemistry at the University of Leipzig. She wrote her PhD thesis in collaboration with the Robert Bosch GmbH and the University of Dresden. Currently, she is working at Bosch in the field of advanced engineering of exhaust gas sensors.
Robert Bosch GmbH, Wernerstr. 51, 70469 Stuttgart, Germany
Ulrich Guth received his PhD from the University of Greifswald in 1975. In 1993 he became a professor for solid state chemistry at the University of Greifswald. From 1999 to 2010 he had been working as the director of the Meinsberg Kurt-Schwabe Research Institute and as a professor for physical chemistry especially sensor and measuring technology at the Dresden University of Technology. His principal research interests are directed towards solid electrolyte sensors and new materials for these high temperature sensors.
Technische Universität Dresden, FB Chemie und Lebensmittelchemie, 01062 Dresden, Germany
Acknowledgement
The authors thank Robert Bosch GmbH for the possibility to work on this topic, D. Britz and M. Engstler from the Material Engineering Center Saarland (Steinbeisforschungszentrum) for the realization of the 3D microstructure reconstructions, and Dr. J. Zosel from Kurt-Schwabe-Institute for the construction of the sophisticated sample holder.
©2017 Walter de Gruyter Berlin/Boston
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- Label-free detection of double-stranded DNA molecules with polyelectrolyte-modified capacitive field-effect sensors
- Characterization of Pt,O2|YSZ electrodes for lambda probes and their ageing in humid atmosphere
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Articles in the same Issue
- Frontmatter
- Editorial
- 7th Kurt Schwabe Symposium
- Beiträge
- Spatial monitoring of the liquid phase with multiparameter sensors in industrial-scale fermenters
- Label-free detection of double-stranded DNA molecules with polyelectrolyte-modified capacitive field-effect sensors
- Characterization of Pt,O2|YSZ electrodes for lambda probes and their ageing in humid atmosphere
- Experimental methods for the determination of stress changes at electrified solid-liquid interfaces
- Development of an automatic system for the on-site pH measurement of soil samples
- Characterization of electrochemical flow cell configurations with implemented disposable electrodes for the direct coupling to mass spectrometry
- Apparatus and methods for using a rotating ring–disk electrode with potentiodynamic control of both working electrodes
