Dextrosil-Viologen: A Robust and Sustainable Anolyte for Aqueous Organic Redox Flow Batteries

Xiu-Liang Lv, Patrick Sullivan, Hui-Chun Fu, XuanXin Hu, Honghao Liu, Song Jin, Wenjie Li, Dawei Feng

Research output: Contribution to journalArticlepeer-review

Abstract

Aqueous organic redox flow batteries (RFBs) are promising for grid-scale energy storage. However, identifying stable and inexpensive organic redox couples suitable for practical applications has been challenging. Herein, we report a robust anolyte species, dextrosil-viologen (Dex-Vi), that demonstrates record overall RFB performance for anolyte redox species in neutral aqueous media, including ultralow anion-exchange membrane permeability, high volumetric capacity capability, and outstanding chemical stability. Remarkably, at a high concentration of 1.5 M (40.2 Ah·L–1 theoretical anolyte volumetric capacity), Dex-Vi shows extremely stable cycling performance without observable capacity decay over one month of cycling. We present a high-yield hydrothermal synthetic approach for this viologen chloride salt with a low-cost precursor. These results not only establish a new benchmark organic anolyte species that is promising for practical RFB applications but also show that the properties of organic redox species can be enhanced with minute performance trade-offs through rationalized structural and synthetic design.
Original languageEnglish (US)
Pages (from-to)2428-2434
Number of pages7
JournalACS Energy Letters
DOIs
StatePublished - Jul 5 2022
Externally publishedYes

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