Year: 2025
Type: article
Abstract: Flow batteries are a promising technology for safe, low‐cost energy storage but suffer from poor energy density. Widely used viologen anolytes can accept two electrons; however, their doubly reduced form is rarely accessed due to stability and solubility issues in aqueous solutions. Here, it is shown that an alternative supporting electrolyte cation, tetrabutylammonium (TBA + ), leads to remarkably stable two‐electron, high‐voltage cycling demonstrated with two highly promising symmetrically substituted viologen anolytes. Promotion of solubility and robustness against reactive oxygen species by TBA + enables the lowest two‐electron capacity fade rate (<1% 2e d −1 ) for viologens to date without cycling in a glovebox.
Source: Batteries & Supercaps
Authors: Md Shahriar Hasan, Jordan L. McMillan, Nicolas E. Holubowitch
Institution: New Mexico Institute of Mining and Technology
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: bronze
Funder: National Science Foundation
OpenAlex ID: W4417449895