Please use this identifier to cite or link to this item: doi:10.22028/D291-30226
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Title: An “interaction-mediating” strategy towards enhanced solubility and redox properties of organics for aqueous flow batteries
Author(s): Huang, Zhifeng
Kay, Christopher W. M.
Kuttich, Björn
Rauber, Daniel
Kraus, Tobias
Li, Hongjiao
Kim, Sangwon
Chen, Ruiyong
Language: English
Title: Nano energy
Volume: 69
Startpage: 1
Endpage: 10
Publisher/Platform: Elsevier
Year of Publication: 2020
Publikation type: Journal Article
Abstract: Aqueous redox flow batteries using electroactive organic materials are currently attracting significant attention. However, the influence of supporting electrolytes on the aqueous solubility, electrochemical reversibility and chemical stability of the organic components has rarely been investigated. Here, a new electrolyte design strategy towards enhanced solubility and chemical stability of active materials is proposed by using interaction-mediating species. 3 molality aqueous imidazolium chlorides, with high ionic conductivity and water-like flowability, enable a record aqueous solubility of 4.3 M for a commercially available nitroxyl radical and reversible 2e− reaction of unmodified methyl viologen at moderate concentrations. With 0.6 M electrolyte, flow cell shows remarkable chemical stability of the nitroxyl radical, excellent cycling stability over 250 cycles at 80 mA cm−2, and a peak power density of 121.6 mW cm−2 at 175 mA cm−2. Furthermore, nitroxyl radical catholyte with a concentration of 3 M is tested in a flow cell. It maintains an impressive steady energy efficiency of 65% at 30 mA cm−2. This work paves a new way for the development of high performance aqueous electrolytes based on organic materials.
DOI of the first publication: 10.1016/j.nanoen.2020.104464
URL of the first publication:
Link to this record: hdl:20.500.11880/28686
ISSN: 2211-2855
Date of registration: 13-Feb-2020
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Chemie
Professorship: NT - Prof. Dr. Tobias Kraus
Collections:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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