To meet the ever-increasing energy demands, advanced electrode materials are strongly requested for the exploration of advanced energy storage and conversion technologies, such as Li-ion batteries, Li-S batteries, Li-]Zn-air batteries, supercapacitors, dye-sensitized solar cells, and other electrocatalysis process （e.g., oxygen reductionlevolution reaction, hydrogen evolution reaction）. Transition metal chalcogenides （TMCs, Le., sulfides and selenides） are forcefully considered as an emerging candidate, owing to their unique physical and chemical properties. Moreover, the integration of TMCs with conductive graphene host has enabled the significant improvement of electrochemical performance of devices. In this review, the recent research progress on TMC]graphene composites for applications in energy storage and conversion devices is summarized. The preparation process of TMC]graphene nanocomposites is also included. In order to promote an in-depth understanding of performance improvement for TMC/graphene materials, the operating principle of various devices and technologies are briefly presented. Finally, the perspectives are given on the design and construction of advanced electrode materials.

Chinese chemical letters

Lithium ion batteries; Electrocatalysis; Lithium oxygen batteries; Zinc air batteries; Oxygen reduction/evolution reaction; Transition metal chalcogenides; Supercapacitors; Graphene/Sulfides/Selenides; Lithium sulfur batteries; Nanoparticles; Usage; Composite materials; Transition metal compounds; Graphene; Methods; Electric properties; Energy storage; Energy conversion (Power resources); Lithium ion batteries; Electrocatalysis; Lithium oxygen batteries; Zinc air batteries; Oxygen reduction/evolution reaction; Transition metal chalcogenides; Supercapacitors; Graphene/Sulfides/Selenides; Lithium sulfur batteries

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