▎ 摘　　要

NOVELTY - Preparation of three-dimensional porous MXene/reduced graphene oxide (rGO) composite material comprises mixing MXene, GO, selenium dioxide (SeO2) and water to obtain mixed liquid; solid-liquid separating to obtain MXene/GO/SeO2 composite material; and heating. USE - The method is for preparation of three-dimensional porous MXene/rGO composite material used as electrode material in supercapacitor (claimed). ADVANTAGE - The method solves the stacking problem of the two-dimensional MXene material. The pleated rGO layer and Se particles can play a certain supporting role between the MXene layers to prevent the collapse of the MXene pore structure. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for three-dimensional porous MXene/rGO composite material comprising MXene layer, pleated rGO layer and Se particles distributed between the MXene layers, where MXene surface is provided with an open hole structure.