English
【Background】
The outstanding physical and chemical properties of two-dimensional materials have been extensively studied in different application areas. Compared to graphene and other two-dimensional materials, the emerging MXenes material has natural hydrophilicity, natural defects, chemically active surface, and ultra-high electrical conductivity. These excellent properties are MXenes to become the most potential alternative in many applications, especially in the field of energy storage and electromagnetic shielding, for example, layered Ti3C2Tx membrane has contact electrochemical performance and electromagnetic shielding performance, but its low yield and easy oxidation defects greatly restrict its commercial development.
【Introduction to Results】
Recently, Professor Maosheng Cao's research group of University of Science and Technology Beijing published a paper entitled Self-assembling flexible 2D carbide MXene film with tunable integrated electron migration and group relaxation toward energy storage and green in Carbon, a top academic journal of carbon materials PAPERS BY EMI SHIELDING. In this paper, a green flexible multilayer Ti3C2Tx/hydroxyethylcellulose composite membrane is reported, which is prepared by self-assembly assisted filtration. Hydroxyethylcellulose and multilayer Ti3C2Tx form an internal interconnection structure through the action of chemical bonds, which makes the composite film have good cycle stability when used as an electrode material for energy storage devices. The transfer of electrons and surface functional groups also play an important role in the process of charging and discharging. In addition, the composite film also exhibits excellent electromagnetic shielding performance, especially through dielectric loss analysis, which shows that electromagnetic waves are mainly dissipated in the form of thermal energy generated by electron migration. The multi-layer stacking effect shows that with the increase of stacking degree, the green electromagnetic shielding performance of the composite film is more and more obvious.
【Summary of this article】
The composite film formed by the chemical bond interaction between two-dimensional Ti3C2Tx and hydroxyethylcellulose was studied, which has good energy storage performance and electromagnetic shielding performance. The Trasatti analysis method was used to prove that the Ti3C2Tx/HEC composite membrane electrode could still have satisfactory performance at a lower scanning rate. At the same time, the composite film also has good electromagnetic shielding performance, and with the increase of the thickness of the composite film, the electromagnetic shielding performance will be further improved. In addition, the composite film combines ultra-thin thickness with high electromagnetic shielding efficiency, which has great advantages over traditional metals and excellent carbon materials. The work provides new ideas for accelerating the rapid development of MXene-based energy storage and electromagnetic shielding materials.
