NiS2 nanoboxes wrapped in carbon with a core–shell structure for high-performance sodium storage

Abstract

One-dimensional nitrogen-doped carbon nanotube wrapped NiS₂ core–shell nanoboxes have been developed. The hollow interior and protective carbon layer significantly enhance sodium storage properties, showing high reversible capacities and superior cycling stability at high current densities. Density functional theory calculations indicated that the heterostructure remarkably enhances the charge transfer process.