Intercalation pseudocapacitance in flexible and self-standing V2O3 porous nanofibers for high-rate and ultra-stable K ion storage

A flexible and self-standing V2O3 porous nanofibers demonstrate high-rate and ultra-stable K storage, which are mainly ascribed to its intrinsic 3D tunnel structure, 1D porous nanostructure and intercalation pseudocapacitive effect. AIMD and DFT calculations reveal that only up to 1 mol K+ can insert into V2O3 crystal and occupy the 6e sites of KV2O3 crystal.232