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Pulsed Polarization of Platinum Electrodes on YSZ

Title data

Fischer, Sabine ; Pohle, Roland ; Magori, Erhard ; Schönauer-Kamin, Daniela ; Fleischer, Maximilian ; Moos, Ralf:
Pulsed Polarization of Platinum Electrodes on YSZ.
In: Solid State Ionics. Vol. 225 (2012) . - pp. 371-375.
ISSN 0167-2738
DOI: 10.1016/j.ssi.2012.03.020

Official URL: Volltext

Abstract in another language

Pulsed polarization is employed for NOx detection using thimble-type standard lambda probes. The model system Pt|YSZ is investigated to understand the reactions occurring at electrodes during alternating pulsed voltages and self discharge. For that purpose, the atmosphere is varied and different pulse parameters like pulse duration and pause between the pulses with opposite sign are evaluated. During polarization in oxygen rich atmosphere, it appears that platinum oxide is formed at one electrode and reduced due by the following pulse with opposite sign at this electrode. At the other electrode, this reaction also takes place, but one pulse delayed. With increasing pulse duration, more platinum is oxidized. According to this, the polarization current of the subsequent pulse grows clearly due to the reduction of the formed oxide and therefore more charge is transferred in contrast to a short polarization pulse duration. Higher oxygen content affects the polarization current in the same way. The theory of platinum oxidation and reduction during alternating polarization is in good agreement to cyclic voltammetry investigations.

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
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: 19 Jan 2015 11:22
Last Modified: 14 Apr 2016 06:40
URI: https://eref.uni-bayreuth.de/id/eprint/5589