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Effect of the Heterogeneous Catalytic Activity of Electrodes for Mixed Potential Sensors

Titelangaben

Ritter, Thomas ; Lattus, Julia ; Hagen, Gunter ; Moos, Ralf:
Effect of the Heterogeneous Catalytic Activity of Electrodes for Mixed Potential Sensors.
In: Journal of the Electrochemical Society. Bd. 165 (2018) Heft 16 . - B795-B803.
ISSN 1945-7111
DOI: https://doi.org/10.1149/2.0181816jes

Angaben zu Projekten

Projekttitel:
Offizieller ProjekttitelProjekt-ID
Sensor zur direkten Ermittlung des Umsatzes eines AutoabgaskatalysatorsHA 5339/1-1

Projektfinanzierung: Deutsche Forschungsgemeinschaft

Abstract

The concept of mixed potential sensors bases on the principle that competing reactions form a mixed electrode potential. The exchange of charge carriers takes place at the TPB. However, it is also assumed that heterogeneously catalyzed gas phase reactions reduce the analyte concentration locally. Since this already occurs before the analyte reaches the TPB, the actually detected concentration is not equal to the dosed concentration. This mechanism is investigated in this work using different electrode configurations. Platinum electrodes designed as full-circles are compared with mesh electrodes. The full-circle electrode shows reduced sensitivity, since the high precious metal content probably catalyzes the gas phase reaction more strongly. This was also confirmed by an electrochemical characterization using polarization curves. The sensitivity of the electrode also increases due to higher sintering temperatures and thus reduced porosity, which influences the area available for heterogeneous catalysis. When gold is used as electrode, this mechanism can hardly be observed, since Au shows low catalytic activity towards the oxidation of the used propene. It is shown how heterogeneous catalytic activity of electrodes affects the sensor signal and to what extent a deviation from the conventionally used mixed potential theory is expected at low analyte concentrations.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
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 > Forschungszentren > Bayreuther Materialzentrum - BayMAT
Forschungseinrichtungen > Forschungsstellen > BERC - Bayreuth Engine Research Center
Fakultäten
Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Funktionsmaterialien
Profilfelder
Profilfelder > Advanced Fields
Forschungseinrichtungen
Forschungseinrichtungen > Forschungszentren
Forschungseinrichtungen > Forschungsstellen
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Eingestellt am: 19 Dec 2018 07:53
Letzte Änderung: 19 Dec 2018 07:53
URI: https://eref.uni-bayreuth.de/id/eprint/46705