Asymmetric Ion Transport in Tunnel-Type Cobalt Vanadate for High-Performance Mn²⁺/H⁺ Hybrid Aqueous Batteries.

ABSTRACT: Aqueous manganese batteries are attractive owing to the deeper Mn/Mn²⁺ redox potential (-1.19 V vs SHE) compared with Zn, yet their development has been hindered by sluggish Mn²⁺ diffusion and parasitic interfacial reactions. Here, the concept of asymmetric-ion transport is introduced, where Mn²⁺ and protons occupy distinct diffusion channels and act synergistically rather than competitively. Using Co(VO₃)₂·2H₂O as a model host, direct structural evidence is provided from Fourier electron density maps and ICP-OES that 0.50 mol of Mn²⁺ is reversibly accommodated alongside 0.14 mol of H⁺. Migration-barrier calculations further reveal orthogonal pathways with balanced activation energies (0.602 eV for Mn²⁺

SUBMITTER: Lee S 

PROVIDER: S-EPMC12802540 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature