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Gas evolution in electrochemical flow cell reactors induces resistance gradients with consequences for the positioning of the reference electrode

DOI zum Zitieren der Version auf EPub Bayreuth: https://doi.org/10.15495/EPub_UBT_00006534
URN to cite this document: urn:nbn:de:bvb:703-epub-6534-8

Title data

Jännsch, Yannick ; Hämmerle, Martin ; Leung, Jane J. ; Simon, Elfriede ; Fleischer, Maximilian ; Moos, Ralf:
Gas evolution in electrochemical flow cell reactors induces resistance gradients with consequences for the positioning of the reference electrode.
In: RSC Advances. Vol. 11 (2021) Issue 45 . - pp. 28189-28197.
ISSN 2046-2069
DOI der Verlagsversion: https://doi.org/10.1039/D1RA05345K

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Project information

Project title:
Project's official titleProject's id
Wertschöpfung durch elektrolytische Reduktion von CO2: Langzeitstabile, Ethen-selektive Prozessführung mit einem hochskalierbaren VerfahrenAZ-1391-19
Open Access PublizierenNo information

Project financing: Bayerische Forschungsstiftung

Abstract

With the transfer of the electrochemical CO2-reduction from academic labs towards industrial application, one major factor is the increase in current density. This can be achieved via the usage of a gas diffusion electrode. It allows for electrochemical reactions at the three-phase boundary between gaseous CO2, liquid electrolyte and electrocatalyst. Thus, current densities in commercially relevant magnitudes of 200 mA cm−2 and beyond can be reached. However, when increasing the current density one faces a new set of challenges, unknown from low current experiments. Here, we address the issue of gas evolution causing a local increase in resistance and the impact on the operation of flow cells with gas diffusion electrodes. We set up a simple simulation model and compared the results with experiments on a real setup. As a result, the gas evolution's strong impact on current-, potential- and resistance-distributions along the flow axis can be described. Main consequence is that the positioning of the reference electrode has a significant effect on the locally measured IR-drop and thus on the measured or applied potential. Therefore, data from different setups must be compared with great care, especially with respect to the potentials, on which the cell is operated.

Further data

Item Type: Article in a journal
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Institutions of the University: Faculties
Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Profile Fields
Profile Fields > Advanced Fields
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Research Institutions > Research Units > ZET - Zentrum für Energietechnik
Research Institutions > Research Units
Language: English
Originates at UBT: Yes
URN: urn:nbn:de:bvb:703-epub-6534-8
Date Deposited: 22 Jul 2022 05:06
Last Modified: 22 Jul 2022 05:06
URI: https://epub.uni-bayreuth.de/id/eprint/6534

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