The effect of ionic association on the electrochemistry of redox mediators for Li-O₂ batteries: developing a theoretical framework.

ABSTRACT: A theoretical framework to explain how interactions between redox mediators (RMs) and electrolyte components impact electron transfer kinetics, thermodynamics, and catalytic efficiency is presented. Specifically focusing on ionic association, 2,5-di-tert-butyl-1,4-benzoquinone (DBBQ) is used as a case study to demonstrate these effects. Our analytical equations reveal how the observed redox couple's potential and electron transfer rate constants evolve with Li⁺ concentration, resulting from different redox activity mechanisms. Experimental validation by cyclic voltammetry measurements shows that DBBQ binds to three Li⁺ ions in its reduced state and one Li⁺ ion in its neutral form, leading to a maximum in the electron transfer kinetic constant at arou

SUBMITTER: Horwitz G 

PROVIDER: S-EPMC11310830 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature