▎ 摘　　要

NOVELTY - Manufacture of electrochromic device involves preparing titanium dioxide nanosheet material using sodium titanate material, hydrochloric acid, methylamine aqueous solution, ultrasonically dispersing MXene in isopropyl alcohol solution, adding hexene in deionized water to establish an interface between the two liquids, slowly injecting obtained dispersion near the interface to form a continuous film, removing the hexene layer and transferring the self-assembled film formed at the interface, transferring directly the film layer by layer in anode portion to a flexible substrate to form titanium carbide/polyethylene terephthalate electrode, depositing graphene oxide on the flexible substrate and then transferring flexible titanium dioxide to the top to obtain titanium dioxide electrode/graphene oxide/polyethylene terephthalate electrode, bonding the electrodes, filling the electrolyte with gel containing lithium perchlorate and poly(methyl methacrylate) and hot-pressing. USE - Manufacture of electrochromic device (claimed) used for intelligent display, building intelligent window, automobile rear-view mirror, intelligent glass, and wearable device. ADVANTAGE - The prepared flexible electrochromic device has high bending resistance and high coloring efficiency. The two-dimensional flexible electrode material improves the coloring efficiency and mechanical performance of the device. DETAILED DESCRIPTION - Manufacture of electrochromic device involves (a) adding lithium fluoride and concentrated hydrochloric acid solution to deionized water as an etchant solution at a certain mass percentage, gradually adding titanium aluminum carbide powder to the etchant solution, maintaining the reaction temperature at 40°C through an oil bath, and stirring reactants for 24 hours, (b) washing the etching product with deionized water, centrifuging to separate, repeating the washing several times, until a stable black upper layer solution is obtained, centrifuging the upper layer solution at a certain rpm for 30 minutes, collecting the dark precipitate, diluting with deionized water, and freeze-drying at a certain temperature to obtain an aerogel, (c) mixing tetrabutyl titanate, ethanol, and acetic acid in sequence with a certain mass ratio to form a gel solution (A), (d) preparing a solution (B) by dissolving a certain mass of sodium carbonate in deionized water, dripping solution (B) into solution (A) by magnetic stirring to form a homogeneous gel, freezing and drying the obtained gel to obtain powder, calcining in air at a certain temperature to obtain initial layered sodium titanate material, (e) disperse sodium titanate material in hydrochloric acid and stirring for 24 hours to fully perform ion exchange to obtain hydrogen titanate, reacting with 25-30 wt.% methylamine aqueous solution at 120°C for 48 hours to fully intercalate to form a mixed solution of methyl acetate and titanium oxide, heating the mixed solution at 100°C for 24 hours in an autoclave, and washing with deionized water and freezing and drying, heating the dried sample at a certain temperature for 2 hours to obtain titanium dioxide nanosheet materials, (f) ultrasonically dispersing MXene in isopropyl alcohol solution for 30 minutes, adding hexene in deionized water to establish an interface between the two liquids, and then slowly injecting obtained dispersion near the interface to form a continuous film, removing the hexene layer and transferring the self-assembled film formed at the interface, transferring directly the film layer by layer in anode portion to a flexible substrate to form titanium carbide/polyethylene terephthalate electrode, depositing graphene oxide on the flexible substrate and then transferring flexible titanium dioxide to the top to obtain titanium dioxide electrode/graphene oxide/polyethylene terephthalate electrode, and (g) mixing a certain amount of lithium perchlorate and 20 wt.% poly(methyl methacrylate) in the polycarbonate solution to obtain an electrolyte gel, using scotch tape to bond the titanium dioxide electrode/graphene oxide/polyethylene terephthalate electrode and titanium carbide/polyethylene terephthalate electrode counter electrode, and filling the electrolyte with a 1 mm interval gel, and finally hot-pressing at 60°C to complete the flexible electrochromic glass package.