| abstract |
The invention discloses a nitrogen-doped carbon-coated molybdenum selenide/graphene core-shell array sandwich structure composite material, a preparation method and application thereof. The method includes: dissolving selenium powder in hydrazine hydrate to form a solution A; dissolving a sodium molybdate dehydrate solution in water to form a solution B; mixing the solutions to form a reaction solution, placing a vertical grapheme collector electrode material growing on a carbon cloth in the reaction solution to carry out hydrothermal reaction, and then conducting washing and drying to obtain a VG-MoSe2 core-shell array structure; dissolving dopamine hydrochloride in water, then soaking the VG-MoSe2 core-shell array structure in the dopamine hydrochloride aqueous solution, carrying out water bath polymerization, and performing washing drying; and carbonizing the dopamine polymerized core-shell array structure under high temperature condition in protective atmosphere, thus obtaining the nitrogen-doped carbon-coated molybdenum selenide/graphene core-shell array sandwich structure composite material. When used as a sodium ion negative electrode material, the constructed composite material has high reversible charge-discharge capacity, long cycle life and excellent rate performance. |