Coupling of ReS2 nanosheet arrays with hollow NiCoS4 nanocubes enables ultrafast Na+ diffusion kinetics and super Na+ storage of a NiCoS4@ReS2 heterostructure

In this paper, an innovative hierarchical NiCoS4@ReS2 heterostructure has been successfully constructed by anchoring ReS2 nanosheet arrays on hollow NiCoS4 nanocubes, in which the heterointerface coupling effect can facilitate the charge transport and enhance the kinetics of the conversion reaction. The internal hollow space provides sufficient space to accommodate the volume expansion and the outer two-dimensional ReS2 nanosheet realizes the rapid electron transport and insertion/extraction of sodium ions. As expected, the hierarchical NiCoS4@ReS2 anode demonstrated a good sodium-ion storage capacity with an outstanding rate capability (297 mA h g(-1) at 3 A g(-1)) and ultra-stable cycling performance (396 mA h g(-1) at 1 A g(-1) after 500 cycles). This original report can provide a straightforward way for the synthesis of heterostructured metal sulfides and can increase the research scope of electrode materials for SIBs.

Automated summary

An innovative hierarchical NiCoS4@ReS2 heterostructure was successfully constructed in this study, showing excellent energy storage capacity and cycling stability. This research provides a new pathway for the synthesis of heterostructured metal sulfides.