Spatial Structure Regulation: A Rod‐Shaped Viologen Enables Long Lifetime in Aqueous Redox Flow Batteries

A stable rod‐like sulfonated viologen (R‐Vi) derivative is developed through a spatial‐structure‐adjustment strategy for neutral aqueous organic redox flow batteries (AORFBs). The obtained R‐Vi features four individual methyl groups on the 2,2′,6,6′‐positions of the 4,4′‐bipyridine core ring. The te...

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Veröffentlicht in:	Angewandte Chemie International Edition Jg. 60; H. 52; S. 26971 - 26977
Hauptverfasser:	Li, Hongbin, Fan, Hao, Hu, Bo, Hu, Linlin, Chang, Gang, Song, Jiangxuan
Format:	Journal Article
Sprache:	Englisch
Veröffentlicht:	WEINHEIM Wiley 20.12.2021 Wiley Subscription Services, Inc
Ausgabe:	International ed. in English
Schlagworte:	Anolytes aqueous organic flow batteries Batteries Chemistry Chemistry, Multidisciplinary Energy efficiency low molecular penetration Membrane permeability Physical Sciences Rechargeable batteries Redox potential rod shape Science & Technology spatial structure regulation viologen STORAGE CATHOLYTE CAPACITY rod shape aqueous organic flow batteries viologen spatial structure regulation ANOLYTE low molecular penetration
ISSN:	1433-7851, 1521-3773, 1521-3773
Online-Zugang:	Volltext
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Zusammenfassung:	A stable rod‐like sulfonated viologen (R‐Vi) derivative is developed through a spatial‐structure‐adjustment strategy for neutral aqueous organic redox flow batteries (AORFBs). The obtained R‐Vi features four individual methyl groups on the 2,2′,6,6′‐positions of the 4,4′‐bipyridine core ring. The tethered methyls confine the movement of the alkyl chain as well as the sulfonic anion, thus driving the spatial structure from sigmoid to rod shape. The R‐Vi with weak charge attraction and large molecular dimension displays an ultralow membrane permeability that is only 14.7 % of that of typical sigmoid viologen. Moreover, the electron‐donating effect of methyls endows R‐Vi with the lowest redox potential of −0.55 V vs. SHE among one‐electron‐storage viologen‐based AORFBs. The AORFB with the R‐Vi anolyte and a K4Fe(CN)6 catholyte exhibits an energy efficiency up to 87 % and extremely low capacity‐fade rate of 0.007 % per cycle in 3200 continuous cycles. We report a rod‐like sulfonated viologen (R‐Vi) anolyte for aqueous redox flow batteries (AORFBs). R‐Vi possesses a low membrane‐penetration rate of ≈10−10 cm2 s−1 and the lowest redox potential of −0.55 V vs. SHE among one‐electron‐storage viologens in AORFBs simultaneously. The R‐Vi‐based AORFB exhibits an extremely low capacity‐fade rate of 0.007 % per cycle in 3200 continuous charging–discharging processes.
Bibliographie:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23
ISSN:	1433-7851 1521-3773 1521-3773
DOI:	10.1002/anie.202110010