Ultrahigh Energy and Power Density in Ni-Zn Aqueous Battery via Superoxide-Activated Three-Electron Transfer.

ABSTRACT: Aqueous Ni-Zn microbatteries are safe, reliable and inexpensive but notoriously suffer from inadequate energy and power densities. Herein, we present a novel mechanism of superoxide-activated Ni substrate that realizes the redox reaction featuring three-electron transfers (Ni ↔ Ni³⁺). The superoxide activates the direct redox reaction between Ni substrate and KNiO₂ by lowering the reaction Gibbs free energy, supported by in-situ Raman and density functional theory simulations. The prepared chronopotentiostatic superoxidation-activated Ni (CPS-Ni) electrodes exhibit an ultrahigh capacity of 3.21 mAh cm^-2 at the current density of 5 mA cm^-2, nearly 8 times that of traditional one-electron processes electrodes. Even under the ultrahigh 200 mA cm

SUBMITTER: Duan Y 

PROVIDER: S-EPMC11607291 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature