Alternately Intercalated Superstructure of MoS2 and C Monolayers for High-Performance Sodium-Ion Energy Storage and Efficient Removal of Cr(VI)

Abstract

Two-dimensional layered materials with a rational design have displayed great promise for applications of energy storage and removal of Cr(VI) from an aqueous environment. Herein, we report an ultrathin-layered MoS2-based hybrid with an interlayer-expanded structure by inserting a N-doped carbon layer into adjacent MoS2 monolayers. The superstructure not only shortens the Na+ diffusion pathway and provides abundant channels for Na+ diffusion but also elevates the electrical conductivity of the material significantly. When applied as a negative electrode in sodium-ion batteries (SIBs), the as-prepared MoS2/carbon hybrid delivers an outstanding cycle performance of 338.31 mAh g–1 at 1000 mA g–1 after 3000 cycles. In addition, due to the abundant pore structure and adsorption sites, the composite delivers an excellent adsorption performance of 128.80 mg g–1 for Cr(VI). This study may inspire developments of SIBs and adsorbent materials.