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Spatially Constrained Organic Diquat Anolyte for Stable Aqueous Flow Batteries

Journal Article · · ACS Energy Letters
 [1];  [2];  [2];  [3];  [3];  [1];  [1];  [1];  [2];  [1]
  1. Joint Center for Energy Storage Research (JCESR), Argonne, IL (United States); Argonne National Laboratory (ANL), Lemont, IL (United States)
  2. Joint Center for Energy Storage Research (JCESR), Argonne, IL (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
  3. Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
We report redox-active organic materials (ROMs) are becoming increasingly attractive for use in redox flow batteries as promising alternatives to traditional inorganic counterparts. However, the reported ROMs are often accompanied by challenges, including poor solubility and stability. Herein, we demonstrate that the commonly used diquat herbicides, with solubilities of >2 M in aqueous electrolytes, can be used as stable anolyte materials in organic flow batteries. When coupled with a ferrocene-derived catholyte, the flow cells with the diquat anolyte demonstrate long galvanic cycling with high capacity retention. Notably, the mechanistic underpinnings of this remarkable stability are attributed to the improved π-conjugation originated from the near-planar molecular conformations of the spatially constrained 2,2’-bipyridyl rings, suggesting a viable structural engineering strategy for designing stable organic materials.
Research Organization:
Argonne National Laboratory (ANL), Lemont, IL (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
Indiana University–Purdue University Indianapolis (IUPUI); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1487127
Journal Information:
ACS Energy Letters, Journal Name: ACS Energy Letters Journal Issue: 10 Vol. 3; ISSN 2380-8195
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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