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Selective multi-gas measurements with solid electrolyte cells operated by cyclovoltammetry

Title data

Ruchets, Anastasiya ; Donker, Nils ; Schönauer-Kamin, Daniela ; Moos, Ralf ; Zosel, Jens ; Guth, Ulrich ; Mertig, Michael:
Selective multi-gas measurements with solid electrolyte cells operated by cyclovoltammetry.
2019
Event: 7th Regional Symposium on Electrochemistry of South-East Europe , 27.-30. Mai 2019 , Split, Croatia.
(Conference item: Conference , Speech )

Abstract in another language

Up to now, solid electrolyte cells (SEC) have mainly been operated with stationary methods such as potentiometry, amperometry or coulometry. These methods are not suitable for selective determining of several redox-active components in gas mixture. In contrast, dynamic methods such as pulse polarization, CV or impedance spectroscopy can use different kinetics of the electrode reactions and allow detecting individual components independently on each other. This is demonstrated here with a commercial SEC based on yttria-stabilized zirconia, which was tested with cyclovoltammetry (CV) in gas mixtures containing redox-active gases such as H2, O2 and H2O. The test setup (Fig.1) was designed for adjustment and measurement of H2, O2 and H2O gas concentrations. While the H2 concentration was regulated by mass flow controllers (MFCs), the adjustment of O2 and H2O was made by pumping O2 with SEC 1. Cyclovoltametric measurements were carried out at SEC 2 with a potentiostat at different scan rates (10-1000 mV/s), ranges (between -0.7 and -0.1 V vs. air reference), sensor temperatures (650-750 °C), gas flow rates (10-50 sccm) and gas concentrations of the components mentioned above in N2 (0-200 vol.-ppm). The water vapour influence was investigated in a concentration range from 0 to 54 vol.-ppm (Fig. 2). Increasing H2O concentrations lead to a slightly grow of the H2-related peak. The method thus allows the selective determination of H2 at different H2O concentrations without sensitivity loss. The results show that both H2 and O2 could be measured quantitatively and with high selectivity at different H2O concentrations.

Further data

Item Type: Conference item (Speech)
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
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 12 Jun 2019 06:54
Last Modified: 12 Jun 2019 06:54
URI: https://eref.uni-bayreuth.de/id/eprint/49460