▎ 摘　　要

Sodium storage materials have gained increasing attention as next-generation power sources. However, realizing high volumetric capacity, high rate performance, and long-term stability remains challenging. Herein, we report a novel strategy for the confined growth of MoS2 nanodots between densely nitrogen-doped graphene layers (DNG/MoS2) assisted by electrostatic attraction between Mo7O24- anions and polyaniline coated graphene oxide nanosheets. The interlayer confined structure provides sufficient space for fast ion transport and accommodates the volume change of MoS2. The large contact area and strong interfacial Mo-N bonds between MoS2 nanodots and nitrogen-doped graphene not only improve the electrical conductivity and charge-transfer kinetics, but also ensure good structural stability. Based on the above merits, DNG/MoS2 delivers high gravimetric and volumetric capacities (514 mA h g(-1)/1439 mA h cm(-3) at 0.1 A g(-1)), remarkable rate performance (290 mA h g(-1)/811 mA h cm(-3) at 10 A g(-1)), and outstanding cycle stability (capacity retention of 82.4% over 2000 cycles at 1 A g(-1)). The assembled sodium ion capacitor exhibits the high energy densities of 129 W h kg(-1) at 79 W kg(-1), as well as long-term cycle stability. Our work may provide new thoughts for designing high density advanced electrode materials.