Ferrocene Catholyte for Aqueous Organic Flow Batteries

  • Author: ChemSusChem
  • Published Date: 09 January 2021
  • Copyright: Wiley-VCH GmbH
thumbnail image: Ferrocene Catholyte for Aqueous Organic Flow Batteries

Related Societies

The large-scale storage of renewable electricity from fluctuating energy sources is important for the wide adoption of these environmentally friendly technologies. Aqueous organic flow batteries (AOFBs) use electroactive water-soluble organic molecules for safe and cost-effective energy storage, and thus, could potentially solve this problem. However, so far AOFB development is hindered by the limited choice of redox-active organics to be used as the catholyte. In addition, how the catholyte structures influence the battery lifespan remains largely unexplored.


Zhengjin Yang, Tongwen Xu, University of Science and Technology of China, Hefei, and colleagues have designed a series of six ferrocene catholytes and investigated how the catholyte structures, electrochemical properties, and cycling stability correlate with each other. The six water‐soluble ferrocene derivatives (general structures pictured above) are 3‐trimethylammonio)propyl)‐ferrocene bromide, 4‐trimethylammonio)butyl)‐ferrocene bromide, (6‐trimethylammonio)hexyl)‐ferrocene bromide, bis((3‐trimethylammonio)propyl)‐ferrocene dibromide, bis((4‐trimethylammonio)butyl)‐ferrocene dibromide, and bis((6‐trimethylammonio)hexyl)‐ferrocene dibromide (BQH−Fc).


The team identified BQH-Fc as the candidate with the highest water solubility and the best stability. When paired with BTMAP-Vi, stable anolyte, no capacity loss was observed for a flow cell at 0.1  M, and a low capacity fade rate of 0.007 % h–1 was recorded at a high concentration of 1.5 M. The work could provide useful guidelines for the design of robust organic catholytes.


 

 

Article Views: 1953

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

If you would like to reuse any content, in print or online, from ChemistryViews.org, please contact us first for permission. more

Follow on Facebook Follow on Twitter Follow on YouTube Follow on LinkedIn Follow on Instagram RSS Sign up for newsletters

Magazine of Chemistry Europe (16 European Chemical Societies) published by Wiley-VCH