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Influence of the V2O5 content of the catalyst layer of a non-Nernstian NH3 sensor

Title data

Schönauer-Kamin, Daniela ; Fleischer, Maximilian ; Moos, Ralf:
Influence of the V2O5 content of the catalyst layer of a non-Nernstian NH3 sensor.
In: Solid State Ionics. Vol. 262 (2014) . - pp. 270-273.
ISSN 0167-2738

Official URL: Volltext

Abstract in another language

The sensing characteristic of a non-Nernstian ammonia sensor, which can be described as an electrochemical cell Au | YSZ | Au, V2O5–WO3–TiO2, is analyzed in dependence on the V2O5-content of the porous SCR-catalyst layer on top of one gold electrode. The ammonia sensitivities are determined at 550 °C for sensors with different amounts of V2O5 (0–3 wt.%). The slope of the semi-logarithmic characteristic curve increases with the vanadia content. The analysis of the half-cell electrode potentials of the half cells YSZ | Au, VWT confirms this behavior. All electrode potentials increase with increasing NH3 concentration and with the vanadia content of the catalyst layer. The V2O5 content of the catalyst layer affects the electrochemical processes at the three-phase boundary Au | YSZ | gas and the resulting voltage of the mixed potential. The gas composition at the three phase boundary can be modified by the catalyst layer. Both the NH3 sensitivity and the electrode potential shifts increase with the ammonia oxidation efficiency. The formation of an activated ammonia species on the catalyst layer, which is electrochemically oxidized, seems to be responsible for the electrode potential shift. According to this suggestion, more activated species are generated with increasing vanadia content. It is then subsequently electrochemically converted with oxygen ions from the YSZ to N2 and H2O.

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 > 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: 01 Dec 2014 09:08
Last Modified: 15 Apr 2016 07:24