Inner Helmholtz layer control through co-solvent strategies for high-performance copper hexacyanoferrate//zinc battery

Copper hexacyanoferrate (CuHCF) demonstrates high working voltage, convenient synthesis methods, and economic benefits. However, capacity decay of CuHCF//Zn full cells is usually observed in aqueous electrolytes due to the dissolution of Cu and Fe, as indicated by the irreversible insertion of Zn