The morphologies and structures can be controlled by adjusting the solvent and sulfur source although an organic–inorganic precursor was not used.

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：A simple one-step surfactant-free hydrothermal approach is presented for the facile synthesis of ultrathin 2D MoS 2 /graphene heterostructure (rGO@MoS 2) assembled foam-like structure. The morphology and structure of the rGO@MoS 2 nanocomposite are characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectra, X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FT-IR). It is found that numerous of ultrathin MoS 2 nanosheets are homogeneously self-assembled on the surface of the foam-like reduced graphene oxide which acts as the skeleton of the nanocomposite. The electrochemical performance of the composite electrode is investigated. Due to countless exposed active sites of the ultrathin 2D MoS 2 nanosheets and rapid ion diffusion and electron transport of the foam-like reduced graphene oxide with high strength and large specific surface area, the rGO@MoS 2 composite shows superior electrochemical performance based on the cycling stability (retaining 657 mAh g-1 after 150 cycles while retaining 110 mAh g-1 after only 60 cycles of MoS 2), and specific capacity (achieving more than 786 mAh g-1 at 100 mA g-1) compared with the pure MoS 2 when used as electrode materials in LIBs.

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