期刊
CHEMISTRYOPEN
卷 6, 期 2, 页码 216-220出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/open.201600155
关键词
cyclic voltammetry; electrochemistry; redox-flow batteries; TEMPO; viologen
资金
- Federal Ministry for Economic Affairs and Energy (BMWi)
- Central Innovation Programme for SMEs (ZIM)
- European Social Fund (ESF)
- Thuringer Aufbaubank (TAB)
- Thuringian Ministry for Economic Affairs, Science and Digital Society (TMWWdG)
- Fonds der Chemischen Industrie (FCI)
By combining a viologen unit and a 2,2,6,6-tetramethylpiperidin-1-oxyl (TEMPO) radical in one single combi-molecule, an artificial bipolar redox-active material, 1-(4-(((1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl)oxy)carbonyl)benzyl)-1-methyl-[4,4-bipyridine]-1,1-diium-chloride (VIOTEMP), was created that can serve as both the anode (-0.49V) and cathode (0.67V vs. Ag/AgCl) in a water-based redox-flow battery. While it mimics the redox states of flow battery metals like vanadium, the novel aqueous electrolyte does not require strongly acidic media and is best operated at pH4. The electrochemical properties of VIOTEMP were investigated by using cyclic voltammetry, rotating disc electrode experiments, and spectroelectrochemical methods. A redox-flow battery was built and the suitability of the material for both electrodes was demonstrated through a polarity-inversion experiment. Thus, an organic aqueous electrolyte system being safe in case of cross contamination is presented.
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