Synergistic effect between 1T’-ReS2 nanosheet arrays and FeS2 nano-spindle in 1T’-ReS2@FeS2@NC heterostructured anode for Na+ storage

Abstract In this paper, 1T’-ReS2@FeS2@NC heterostructure was successfully prepared by growing ReS2 nanosheet arrays on porous FeS2 nano-spindle by using metal-organic framework (MIL-88) as precursor. The heterostructure with external nanosheet array structure ensures sufficient contact between the electrolyte solution and the electrode material by shortening the ion transfer path. When 1T’-ReS2@FeS2@NC heterostructure was used as anode material of sodium ion battery, it delivered excellent rate performance and cycling stability, reaching a high specific capacity of 729 mAh g−1 at a current density of 0.1 A g−1. Meanwhile, the results of galvanostatic intermittent titration technique (GITT) and electrochemical impedance spectroscopy (EIS) tests can indicate that the heterostructure greatly enhances the Na+ diffusion kinetics through combining of three-dimensional porous FeS2 nano-spindle and two-dimensional nanosheet arrays. It is proved that 1T’-ReS2@FeS2@NC heterostructure is a promising anode material for sodium-ion batteries.