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Identification of Oxygen Exchange Mechanisms on Geometrically Defined Pt|YSZ Electrodes

Title data

Zheng, Yingjing ; Sauter, Ulrich ; Oehler, Gudrun ; Streeb, Martin ; Moos, Ralf:
Identification of Oxygen Exchange Mechanisms on Geometrically Defined Pt|YSZ Electrodes.
2014
Event: 65th Annual Meeting of the International Society of Electrochemistry , 31.08.-05.09.2014 , Lausanne, Switzerland.
(Conference item: Conference , Other Presentation type)

Abstract in another language

For application areas like fuel cells, oxygen sensors, or catalysis, the electrode system oxygen|platinum|yttria stabilized zirconia (YSZ) is still of great importance today, either as model system or as irreplaceable material system for applications in harsh environments. Until now research has been limited to (a) thick film porous electrodes, which are close to application materials, but difficult to define and to reproduce, and (b) thin film electrodes, which may have different properties than electrodes in real applications. In order to overcome this material gap, we investigated thick film model electrodes with defined geometry but without open porosity in this work.
The electrode morphology was characterized with scanning electron microscopy (SEM), focused ion beam (FIB) and FIB-SEM for 3D reconstruction. Electrochemical impedance spectroscopy (EIS) was performed for varying electrode morphology, temperature and oxygen partial pressure. In order to identify the processes in the EIS spectra, the results are compared with a physicochemical model, originally based on a work by Mitterdorfer. It includes processes like adsorption, diffusion and charge transfer. Ionic conduction and double layer capacitance have been added to the model. Furthermore, the influence of surface coverage has been taken into account. Still, not all phenomena observed in experiments could be explained by this currently accepted model. Therefore, further possible mechanisms are presented in this work.

Further data

Item Type: Conference item (Other)
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
Faculties
Faculties > Faculty of Engineering Science > Chair Functional Materials
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
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: 11 May 2015 12:25
Last Modified: 15 Apr 2016 07:27
URI: https://eref.uni-bayreuth.de/id/eprint/13167