Surfactant-free self-assembled MXene/carbon nanotubes hybrids for high-rate sodium- and potassium-ion storage

CNT–MXene ultralight membranes: fabrication, surface nano/microstructure, 2D–3D stacking architecture, ion-transport mechanism, and potential application as interlayers for Li–O2 batteries

“…The method to fabricate CNT-MXene hybrid films must address three critical criteria to be practical for a variety of applications: (1) uniform CNT dispersion, (2) simplicity, cost, and safety for MXenes, and (3) suitability for preparation of ultralight films without breaking the film's continuity. The reported methods based on heterocoagulation and selfassembly 39,40,62,68,69 could effectively address the first criterion of uniform CNT dispersion and, to some extent, the second criterion. However, they cannot fabricate ultralight yet continuous composite films as the coagulation of small amounts of materials dispersed over a large area would lead to discontinuity.…”

“…On the other hand, the fabrication method of such hybrid films should also address the need for ultralight films for applications requiring, for instance, simultaneously high energy density and protection from hazardous ions or byproducts. Methods reported based on heterocoagulation and selfassembly 39,40,62,68,69 cannot fabricate continuous centimeterscale films by a facile technique such as vacuum filtration when using an ultralow amount of materials. In contrast to dispersions of single-phase nanomaterials, in hybrid or composite dispersions, when ultrasmall amounts of constituent materials are dispersed over a sizable centimeter-scale area, their coagulation/self-assembly creates island-like deposits instead of a continuous and uniform centimeter-scale film.…”

MXene: Nanoengineering and Application as Electrode Materials for Supercapacitors

“…碳纳米管(CNT)具有较高的纵横比和导电性， 是抑制 MXene 堆积的高效层间间隔物，并可进一步 暴露更多的活性位点，用于电荷存储 [91] 。 到目前为止， 研究人员为构建 Ti3C2Tx/CNT 复合 材料付出了大量努力。Lian 等 [91] 利用带正电荷的 Ti3C2Tx 和带负电荷的 CNT 之间的静电相互作用，在 HCl 的辅助下制备了 Ti3C2Tx/CNT 组件。 Ti3C2Tx/CNT 复合材料具有多孔结构和大比表面积，有利于电解 质离子的迁移和扩散， 使 Ti3C2Tx/CNT 电极具有优异 的电化学性能。Yang 等 [76] 采用电泳沉积(EPD)法 在石墨纸上沉积了无粘结剂的 Ti3C2 MXene /碳纳米 管(Ti3C2/CNTs)薄膜。所制备的 Ti3C2/CNTs 电极 比电容增强，并且具有优异的循环稳定性，在 10000 次循环后电容没有衰减。这是由于 CNTs 掺入到 MXene 中，形成了牢固的结构，阻止了 MXene 的重 新堆积，从而提高电化学性能。…”

Facile self-assembly of sandwich-like MXene layered multiscale structure nanocomposite

“…In order to investigate the effect of the entry of Ag NPs and Cu NPs sequentially on the interlayer of V 2 CT x , the layer spacing of M-II, M-III and M-IV composites are calculated by the Bragg equation (2dsinθ = nλ) [34]. Figure 2(b) reveals the variation of the layer spacing of M-II, M-III and M-IV composites.…”