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Investigation of Oxygen Transport Paths in Geometrically Defined Thick-Film Composite Pt Electrodes on YSZ

Title data

Zheng, Yingjing ; Sauter, Ulrich ; Moos, Ralf:
Investigation of Oxygen Transport Paths in Geometrically Defined Thick-Film Composite Pt Electrodes on YSZ.
In: Journal of the Electrochemical Society. Vol. 163 (2016) Issue 8 . - F877-F884.
ISSN 1945-7111
DOI: https://doi.org/10.1149/2.1081608jes

Abstract in another language

Thick-film platinum (Pt) model electrodes with defined geometry screen-printed on yttria stabilized zirconia (YSZ) substrate were investigated to identify oxygen reactions and transport pathways in the Pt|YSZ electrode system. A 3D reconstruction of the electrode based on Focused Ion Beam Scanning Electron Microscopy (FIB-SEM) data was made to confirm that no percolating pores exist. Electrochemical impedance spectroscopy (EIS) was performed at 800°C and oxygen partial pressures (pO2) between 10^−4 and 1 bar. The experimental data was interpreted using a Randles equivalent circuit. By variation of electrode area and three phase boundaries as well as electrode thickness, two oxygen transport pathways were found: an electrode surface path which contributes to the conductivity mostly at low pO2 and an electrode bulk path that represents the dominating path at high pO2. An advanced electrode layout enabled the separation of the transport pathways and confirmed that the two paths are parallel.

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 > ZET - Zentrum für Energietechnik
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: 20 Jun 2016 06:48
Last Modified: 20 Jun 2016 06:48
URI: https://eref.uni-bayreuth.de/id/eprint/32829