Construction of MoS2/NiS2Heterostructure with Fast Interfacial Reaction Kinetics for Ultrafast Sodium Storage

Constructing heterostructure is a valid method to reinforcing sodium storage performance of transition metal chalcogenides materials. Herein, a simple, safe and controllable one step hydrothermal method is proposed to synthesize MoS2/NiS2heterostructure. Due to the difference in band gaps and work functions of MoS2and NiS2, the charges are redistributed at the MoS2/NiS2heterointerfaces, thereby accelerating the migration of electrons and Na+. The heterointerfaces provide extra active sites for storing Na+, thereby increasing the sodium storage capacity of heterostructure. Furthermore, the distinct redox potentials of NiS2and MoS2promote the structural stability of MoS2/NiS2heterostructure during electrochemical reaction processes. Consequently, the obtained MoS2/NiS2heterostructure anode exhibits superior rate properties (339.4 mAh g−1at 10Ag−1) and ultra-stable cycling stability (480.5 mAh g−1after 350 cycles at 1Ag−1). This paper presents a valid strategy for creating heterostructure anodes with excellent sodium storage properties.