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Host‐Guest Interactions Enhance the Performance of Viologen Electrolytes for Aqueous Organic Redox Flow Batteries
Author(s) -
Korshunov Aleksandr,
Gibalova Anna,
Grünebaum Mariano,
Ravoo Bart Jan,
Winter Martin,
CekicLaskovic Isidora
Publication year - 2021
Publication title -
batteries and supercaps
Language(s) - English
Resource type - Journals
ISSN - 2566-6223
DOI - 10.1002/batt.202100018
Subject(s) - redox , flow battery , viologen , aqueous solution , electrolyte , chemistry , chemical engineering , faraday efficiency , electrochemistry , supramolecular chemistry , solubility , energy storage , inorganic chemistry , electrode , organic chemistry , molecule , power (physics) , physics , quantum mechanics , engineering
Host‐guest interactions are an attractive approach to design redox electrolytes, enabling to precisely tune the key properties for redox flow batteries such as half‐cell redox potential, solubility, and stability. Herein we report a host‐guest complex of highly water soluble (2‐hydroxypropyl)‐β‐cyclodextrin with 1‐decyl‐1′‐ethyl‐4,4′‐bipyridinium dibromide as anolyte in a new aqueous organic redox flow battery (AORFB). The supramolecular anolyte ensured the total RFB voltage increase of ≈9 % up to 0.97 V and provided a stable capacity delivery for more than 500 cycles with a capacity fade rate of 0.037 %/cycle (2.84 %/day) at high Coulombic (>99.5 %) and energy (>62 %) efficiencies. The results highlight host‐guest interactions as promising strategy towards more effective storage of renewable energy within AORFBs.