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Low temperature characteristics of the Pt|YSZ electrode system

Title data

Zheng, Yingjing ; Sauter, Ulrich ; Moos, Ralf:
Low temperature characteristics of the Pt|YSZ electrode system.
2018
Event: The 69th Annual Meeting of the International Society of Electrochemistry , 2.-7.9.2018 , Bologna, Italy.
(Conference item: Conference , Speech )

Abstract in another language

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.

Further data

Item Type: Conference item (Speech)
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Faculties
Faculties > Faculty of Engineering Science > Chair Functional Materials
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 17 Sep 2018 10:38
Last Modified: 17 Sep 2018 10:38
URI: https://eref.uni-bayreuth.de/id/eprint/45806