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On the stability of bismuth in modified carbon felt electrodes for vanadium redox flow batteries : An in-operando X-ray computed tomography study

Title data

Gebhard, Marcus ; Tichter, Tim ; Schneider, Jonathan ; Mayer, Jacob ; Hilger, André ; Osenberg, Markus ; Rahn, Mirko ; Manke, Ingo ; Roth, Christina:
On the stability of bismuth in modified carbon felt electrodes for vanadium redox flow batteries : An in-operando X-ray computed tomography study.
In: Journal of Power Sources. Vol. 478 (2020) . - No. 228695.
ISSN 0378-7753
DOI: https://doi.org/10.1016/j.jpowsour.2020.228695

Abstract in another language

Decorating carbon felt electrodes with bismuth and bismuth oxide nanoparticles is proposed to be a promising strategy for enhancing the sluggish electron transfer kinetics of the negative half-cell reaction in vanadium redox flow batteries. However, regarding the highly corrosive electrolyte solution, major concerns on the stability of the solid bismuth phase and thus on the local catalyst distribution and catalyst functionality emerge. With this study we present a novel in-operando cell design allowing for X-ray imaging during battery tests in laboratory scale dimensions. In this manner, we verify a dissolution of the bismuth/bismuth oxide particles in open circuit potential condition at SOC = 0 (SOC: state of charge) as well as a re-deposition during the charging process of the battery. No dissolution during the discharging process can be detected. With this knowledge, the effect of the bismuth/bismuth oxide distribution on the electrochemical performance of the battery is investigated. By performing the deposition during the charging process at different electrolyte flow rates, different deposition patterns are obtained. However, independent of the deposition pattern, similar cell performances are achieved that put the enhancement effect by bismuth as heterogeneous catalyst into question.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Vanadium redox flow battery; In-operando; X-ray radiography; X-ray tomography; Bismuth; Carbon felt electrode
Institutions of the University: Faculties > Faculty of Engineering Science > Chair Electrochemical Process Engineering > Chair Electrochemical Process Engineering - Univ.-Prof. Dr. Christina Roth
Result of work at the UBT: No
DDC Subjects: 500 Science > 540 Chemistry
600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 26 Aug 2021 07:34
Last Modified: 26 Aug 2021 07:34
URI: https://eref.uni-bayreuth.de/id/eprint/66852