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Oxygen transport paths in screen-printed Pt-Al2O3 composite model electrodes on YSZ

Title data

Zheng, Yingjing ; Sauter, Ulrich ; Moos, Ralf:
Oxygen transport paths in screen-printed Pt-Al2O3 composite model electrodes on YSZ.
In: Solid State Ionics. Vol. 316 (March 2018) . - pp. 53-58.
ISSN 0167-2738
DOI: https://doi.org/10.1016/j.ssi.2017.12.026

Official URL: Volltext

Abstract in another language

In this work, Pt-Al2O3 composite electrodes without open porosity, screen-printed on polycrystalline YSZ, were analysed in order to identify relevant oxygen transport paths in thick-film electrodes. By using electrochemical impedance spectroscopy, the electrode processes were investigated at different oxygen partial pressures (pO2) and temperatures (T). Special sample layouts allowed the separation of three phase boundary (tpb) and electrode area-dependent transport processes. We found that the area-related transport path is dominating at low temperatures and high pO2, with a relatively low activation energy of 0.2 to 0.6 eV and a pO2− 0.7 dependence. In contrast, the tpb-related transport path dominates at high temperatures and low pO2, with activation energies between 0.8 and 1.4 eV and a pO2− 0.3 behaviour. A tracer experiment was performed additionally to visualize the location of oxygen incorporation below the electrode.

Further data

Item Type: Article in a journal
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
Research Institutions > Research Units > BERC - Bayreuth Engine Research Center
Faculties
Faculties > Faculty of Engineering Science > Chair Functional Materials
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Units
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 10 Jan 2018 08:08
Last Modified: 10 Jan 2018 08:08
URI: https://eref.uni-bayreuth.de/id/eprint/41593