Graphene‐Like MoS2/Graphene Composites: Cationic Surfactant‐Assisted Hydrothermal Synthesis and Electrochemical Reversible Storage of Lithium

A cationic surfactant‐assisted hydrothermal route is developed for the facile synthesis of graphene‐like MoS₂/graphene (GL‐MoS₂/G) composites based on the hydrothermal reduction of Na₂MoO₄ and graphene oxide sheets with L‐cysteine in the presence of cetyltrimethylammonium bromide (CTAB), following by annealling in N₂ atmosphere. The GL‐MoS₂/G composites are characterized by X‐ray diffraction, electron microscopy, high‐resolution transmission electron microscopy, and Raman spectroscopy. The effects of CTAB concentration on the microstructures and electrochemical performances of the composites for reversible Li⁺ storage are investigated. It is found that the layer number of MoS₂ sheets decreases with increasing CTAB concentration. The GL‐MoS₂ sheets in the composites are few‐layer in the case of 0.01～0.03 mol L^?1 CTAB of hydrothermal solution and single‐layer in the case of 0.05 mol L^?1 CTAB. The GL‐MoS₂/G composites prepared with 0.01–0.02 mol·L^?1 of CTAB solution exhibit a higher reversible capacity of 940–1020 mAh g^?1, a greater cycle stability, and a higher rate capability than other samples. The exceptional electrochemical performance of GL‐MoS₂/G composites for reversible Li⁺ storage could be attributed to an effective integration of GL‐MoS₂ sheets and graphene that maximizes the synergistic interaction between them.