Preparation and application of graphene-based ternary composite porous carbon electrode material for capacitive deionization

• Main Authors: LIU SHI, LI JINCHUN, ZHOU YINJIE, GONG TIANYANG, WANG RAN, LI BINGJIAN
• Format: Patent
• Language: Chinese; English
• Published: 27.06.2023
• Subjects: BASIC ELECTRIC ELEMENTS; CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES ORLIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE; ELECTRICITY

The invention belongs to the technical field of capacitive deionization desalination, and relates to preparation and application of a graphene-based ternary composite porous carbon electrode material for capacitive deionization. The preparation method comprises the following steps: firstly, preparing nitrogen-doped three-dimensional graphene hydrogel from graphene oxide, hydrogen peroxide and urea through a one-step hydrothermal method; dispersing the nitrogen-doped three-dimensional graphene hydrogel, a carbon nanotube and zinc nitrate hexahydrate in absolute methanol to obtain a solution A; dissolving dimethylimidazole in absolute methanol to obtain a solution B; then adding the solution B into the solution A, fully stirring and standing, and carrying out suction filtration and drying to obtain a nitrogen-doped three-dimensional graphene/carbon nanotube/ZIF-8 composite material precursor; and finally, calcining the precursor at high temperature in an argon atmosphere, oxidizing and etching by nitric acid, a