V-O-Ru Heterogeneous Interphase Reversible Reconstruction Endowing ZnVO·7.4HO/0.65RuO Cathode Robust H/Zn Storage.

Intercalation-type layered vanadium oxides have been widely explored as cathode materials for aqueous zinc-ion batteries (AZIBs). However, attaining both high power density and superior stability remains a formidable challenge. Herein, layered vanadium oxides are pre-intercalated with Zn to form ZnVO·7.4HO (ZVO), which is then combined with RuO nanoparticles to construct a ZVO/RuO heterostructure featuring interphase V─O─Ru bonds. ZVO/RuO heterostructure exhibits a dynamic stable coupling at the interphase via V─O─Ru chemical bonds reconstruction during discharging/charging processes. The dynamically reversible reconstruction of interphase V─O─Ru bonds provides a fast electron transfer channel between RuO and ZVO cathode, as demonstrated by ex situ X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT) calculations, making RuO an additional electron acceptor and donor, and accelerating the migration of H/Zn in layered ZVO cathode. Therefore, an ultra-high capacity (411 mAh g at 0.5 A g, 225 mAh g at 20 A g) and long cycling stability (a retention of 92.2% at 20 A g over 20000 cycles) performances are achieved. This interphase reversible reconstruction route provides a promising approach to achieving excellent cycling stability in cathode materials.