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

Abstract Based on the advantages of MoS 2 and MoSe 2 , a new type of metal chalcogenide MoS x Se 2-x (taking MoS 1.5 Se 0.5 as an example in the article) with similar structures and functional complementation to MoS 2 and MoSe 2 is proposed. In the paper, MoS 1.5 Se 0.5 nanosheets supported by 3D reduced graphene oxide (MoS 1.5 Se 0.5 -3D rGO) have been synthesized by simply applying a solid-state reaction process together with a hydrothermal process. MoS 1.5 Se 0.5 nanosheets are homogeneously distributed into 3D porous networks of rGO and 3D-rGO, which exhibits a three-dimensionally interconnected wrinkle structure for MoS 1.5 Se 0.5 loading, and offers convenient channels for electron transport and lithium ion diffusion. MoS 1.5 Se 0.5 -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 MoS 1.5 Se 0.5 -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 MoS 1.5 Se 0.5 -3D rGO is a promising anode material for the lithium-ion storage.