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

Abstract

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.