Novel metal chalcogenide supported on three-dimensional graphene foam for enhanced lithium storage

Based on the advantages of MoS2 and MoSe2, a new type of metal chalcogenide MoSxSe2-x (taking MoS1.5Se0.5 as an example in the article) with similar structures and functional complementation to MoS2 and MoSe2 is proposed. In the paper, MoS1.5Se0.5 nanosheets supported by 3D reduced graphene oxide (MoS1.5Se0.5-3D rGO) have been synthesized by simply applying a solid-state reaction process together with a hydrothermal process. MoS1.5Se0.5 nanosheets are homogeneously distributed into 3D porous networks of rGO and 3D-rGO, which exhibits a three-dimensionally interconnected wrinkle structure for MoS1.5Se0.5 loading, and offers convenient channels for electron transport and lithium ion diffusion. MoS1.5Se0.5-3D rGO composite delivers a reversible capacity of 1100 mAh g−1 at the current density of 100 mA g−1 and up to 1225 mAh g−1 after 200 cycles. Meanwhile, the MoS1.5Se0.5-3D rGO composite has an outstanding rate performance with a high capacity retention of 375 mAh g−1 at the C-rate of 10 C (1 C = 680 mAh g−1), indicating that the MoS1.5Se0.5-3D rGO is a promising anode material for the lithium-ion storage.