▎ 摘　　要

NOVELTY - Preparing a nanosheet-shaped tungsten oxide/graphene oxide core-shell structure material involves: (1) mixing tungsten powder and sodium fluoride in a mass ratio of 10:1-10:3 to obtain a mixed powder (A); (2) uniformly mixing 5-15 ml 30 %mass hydrogen peroxide and 5-15 ml 69 %mass nitric acid to obtain a mixed solution (B); (3) adding 2-6 ml 0.05-0.15% a graphene oxide aqueous solution to the mixed solution (B) to obtain a mixed solution (C); (4) taking 1-8 g mixed powder (A), slowly adding to the mixed solution (C) and stirring until the powder is fully dissolved to obtain a solution (E); and (5) placing the solution (E) in a hydrothermal reaction kettle to carry out hydrothermal reaction at 120-200 degrees C, cooling after the reaction is completed, followed by washing, collecting and drying. USE - The method is useful for preparing a nanosheet-shaped tungsten oxide/graphene oxide core-shell structure material, which is useful in sodium/lithium/magnesium-ion batteries, supercapacitors and photocatalysis (claimed). ADVANTAGE - The method prepares the nanosheet-shaped tungsten oxide/graphene oxide core-shell structure material with excellent performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the nanosheet-shaped tungsten oxide/graphene oxide core-shell structure material obtained by the preparation method, where the core-shell structure material is a square single-layered sheet-shaped structure, the inner core is a square tungsten oxide nanosheet, the outer layer is graphene oxide, the tungsten oxide single layer sheet has a thickness of 10-30 nm, and length and width of 100-250 nm, and the outer layer of graphene oxide has a coating thickness of 5-20 nm.