Boosting OH− Adsorption Kinetics of Ni3S2 Nanosheets via Mn‐Doping for High‐Performance Aqueous Zinc‐based Batteries

Aqueous energy storage systems have garnered significant attention for large‐scale energy storage grids and portable electronics due to their inherent safety and environmental benignity. Nickel sulfide, as the potential cathode for aqueous alkaline Zn‐based batteries, faces challenges such as weak OH − adsorption, low electrochemical activity and slow reaction kinetics. Herein, the Mn‐doped strategy is employed to endow Ni 3 S 2 with ultrahigh electrochemical performance via a simple hydrothermal process. Benefiting from the optimized electronic states of Ni sites after Mn doping in Ni 3 S 2 , the Mn‐doped Ni 3 S 2 (M‐NiS) exhibits significantly enhanced capacity and rate capability compared to pristine Ni 3 S 2 (NiS). Therefore, the assembled M‐NiS//Zn battery achieves an ultrahigh areal capacity of 4.15 mAh cm −2 and excellent rate performance of 0.75 mAh cm −2 at 80 mA cm −2 . Moreover, it shows no capacity decay after 1000 cycles at the current density of 40 mA cm −2 , indicating an exceptional cycling stability. The work is expected to serve as a guide for paving the way for developing high‐performance transition metal sulfide.