Probing Kinetics Beyond Tafel Unlocks Highly Accurate Exchange Currents for Aqueous Zinc Metal Batteries.

ABSTRACT: Understanding the kinetics of zinc electrodeposition on current collectors is crucial for improving aqueous zinc-metal battery (AZMB) performance, yet it remains largely unexplored. A major challenge within the field is the inconsistent reporting of kinetic parameters, particularly the exchange current density (j₀), which is essential for accurately modeling and simulating zinc electrodeposition reactions. In this study, fast scan voltammetry on tungsten ultramicroelectrodes (UMEs) is employed to decouple mass transfer effects and isolate charge transfer kinetics. These results show that while zinc electrodeposition is a two-electron process, the rate-limiting step involves a one-electron transfer, validated through Butler-Volmer and Marcus-Hush models. This work also identifies

SUBMITTER: Rana A 

PROVIDER: S-EPMC12825348 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature