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Low temperature characteristics of the Pt|YSZ electrode system


Zheng, Yingjing ; Sauter, Ulrich ; Moos, Ralf:
Low temperature characteristics of the Pt|YSZ electrode system.
Veranstaltung: The 69th Annual Meeting of the International Society of Electrochemistry , 2.-7.9.2018 , Bologna, Italy.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung , Vortrag )


The electrode system platinum|yttria stabilized zirconia (Pt|YSZ) is of importance for automotive exhaust gas sensors and in the field of catalysis. In the area of solid oxide fuel cells (SOFC), this electrode system is used in micro SOFCs or as model system for the anode. Despite a long history of research, there are still many open questions concerning this electrode system. Especially at “low” operating temperatures (below 600 °C), the influence of platinum oxide is speculated. Pöpke et al. investigated the influence of platinum oxide by applying cyclic voltammetry (CV) on thin-film Pt electrodes on single crystalline YSZ. Cathodic peaks were observed in the voltammograms, which were said to correlate to the amount of Pt oxides formed. In order to find out if these phenomena are also applicable to screen-printed thick-film electrodes on polycrystalline YSZ, which are more common in industrial applications, we investigated a model composite electrode based on Pt and Al2O3. The concept of this kind of electrodes is described in. CV was performed at different oxygen partial pressures (pO2) and temperatures. We found that the peak location and size depends on temperature, pO2 and the maximum voltage in CV. The appearance of peaks as a function of voltage, pO2 and temperature is presented in form of a phase diagram, as shown in Fig. 1. An initial model that explains this behavior will be presented.

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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 > Forschungszentren > Bayreuther Materialzentrum - BayMAT
Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Funktionsmaterialien
Profilfelder > Advanced Fields
Forschungseinrichtungen > Forschungszentren
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Eingestellt am: 17 Sep 2018 10:38
Letzte Änderung: 17 Sep 2018 10:38
URI: https://eref.uni-bayreuth.de/id/eprint/45806