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

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: https://doi.org/10.1039/D1RA05345K

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

Project financing: Bayerische Forschungsstiftung

Abstract in another language

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
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: 22 Sep 2021 10:23
Last Modified: 22 Sep 2021 10:23
URI: https://eref.uni-bayreuth.de/id/eprint/67081