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Organic electrolytes for redox flow battery – electrochemical properties on glassy carbon and graphite felt electrodes

Authors: Mazur Petr | Muller D | Mrlík Jindřich | Kvíčala Jaroslav | Hloušková Zuzana | Klikar Milan | Bureš Filip

Year: 2019

Type of publication: ostatní - přednáška nebo poster

Page from-to: nestránkováno

Titles:

Language	Name	Abstract	Keywords
eng	Organic electrolytes for redox flow battery – electrochemical properties on glassy carbon and graphite felt electrodes	Redox flow battery is a promising technology for the stationary energy storage for large-scale applications. The main advantage of the flow concept, when compared to standard Li-ion batteries, is the decoupled power to capacity, non-flammability and simplified heat removal, which ensure safe and durable battery operation. The systems based on inorganic (especially vanadium) chemistry are being installed worldwide in MWh scales. The increased price of vanadium and its limited energy density stimulate the development of alternative electrolytes. The organic redox-couples are potential candidates for the application as their properties can be tuned by their chemical structure and they can be cheaply produced e.g., from oil residues. In our contribution we present electrochemical properties of the selected compounds based on quinone and viologen derivatives. The kinetic parameters of electrochemical reaction and diffusion coefficients were evaluated from voltammetric experiments using glassy carbon rotating disc electrode at different pH of electrolyte. The selected molecules were tested in a flow half-cell using carbon felt electrodes and the effect of electrode surface functionalization on the reversibility was investigated. Finally, the mid-term electrochemical stability of the most promising candidates was assessed using repetitive constant current charge-discharge cycles. The chemical structure of the redox molecules before and after the cycling is evaluated by NMR analysis of the electrolyte.	Organic electrolytes; redox flow battery; glassy carbon