Iodine-Functionalized Titanium Carbide MXene with Ultra-Stable Pseudocapacitor Performance

Vertically Aligned Bismuthene Nanosheets on MXene for High-Performance Capacitive Deionization

“…This result demonstrates that Cu has been successfully translated into bismuthene after the galvanic replacement reaction. As shown in Figure b, the Raman spectrum of pure MXene displays feature peaks located at 155, 400, and 625 cm –1 , corresponding to Ti 3 C 2 T x MXene. , It is worth noting that in the Bi-ene NSs@MXene heterostructure two distinct peaks located severally at around 75 and 97 cm –1 are detected, which correspond to the E g and A 1g modes of bismuthene, respectively. , Meanwhile, the Ti 3 C 2 T x MXene characteristic peak (at 155, 400, and 625 cm –1 ) can also be observed in the Bi-ene NSs@MXene heterostructure. Furthermore, the X-ray photoelectron spectra (XPS) analysis was carried out to explore the chemical compositions and valence states of the Bi-ene NSs@MXene heterostructure.…”

“…As shown in Figure 1b, the Raman spectrum of pure MXene displays feature peaks located at 155, 400, and 625 cm −1 , corresponding to Ti 3 C 2 T x MXene. 31,36 It is worth noting that in the Bi-ene NSs@MXene heterostructure two distinct peaks located severally at around 75 and 97 cm −1 are detected, which correspond to the E g and A 1g modes of bismuthene, respectively. 21,40 Meanwhile, the Ti 3 C 2 T x MXene characteristic peak (at 155, 400, and 625 cm −1 ) can also be observed in the Bi-ene NSs@MXene heterostructure.…”

“…In recent years, a group of two-dimensional transition metal carbide/nitride (MXene) materials have attracted wide attention because of its special lamellar structure, large specific surface area, and good electrical conductivity. − Typically, MXene is prepared by selectively etching A layers from MAX phase precursors (M represents transition metal, X stands for C or/and N, A represents Al, Ga, Si, etc.) using an acidic aqueous solution containing fluoride ions, such as hydrofluoric acid (HF) or a mixture of lithium fluoride and hydrochloric acid (LiF+HCl). ,, Nonetheless, the high toxicity and corrosive property of an acidic aqueous solution containing fluoride ions give rise to considerable safety and environmental problems. , Recently, a safe and environmentally friendly Lewis acidic etching route was developed by using nonhazardous Lewis acid molten salt. − Typically, Ti 3 C 2 T x MXene (T represents surface terminations, such as −O, and −Cl) can be prepared by using a Lewis acid (such as copper chloride) to remove Al element from Ti 3 AlC 2 . Note that the Cu 2+ can be concomitantly reduced into Cu metal on the surface of MXene during the etching process.…”

A Ti3C2Tx@PANI core–shell heterostructure assembled into a 3D porous hydrogel as a free-standing electrode for high-energy supercapacitors

“…[15][16][17] 2D nanomaterials have a crystal structure with a monoatomic layer or a polyatomic layer thickness; the surface of the sheet can provide a huge EDLC and a broad reaction platform, and the edge of the sheet can provide high pseudocapacitance. [18][19][20][21][22][23][24][25] MXenes, [26][27][28][29][30] 2D transition metal carbides, nitrides or carbonitrides (typical 2D nanomaterials), have the general formula M n+1 X n T z , where M represents the transition metal, X represents C and/or N, n ranges usually from 1 to 3, and T z represents external functional groups. [31][32][33] In the MXene family, Ti 3 C 2 T x stands out for its high conductivity, excellent specific capacitance and abundant ion transmission channels.…”

MXene: Nanoengineering and Application as Electrode Materials for Supercapacitors

“…Talapin 课题组 [40] 在熔融无机盐中通过取代和消除反 应来制备和去除表面端基，合成了具有 O、NH、S、 Cl、Se、Br 和 Te 表面端基的 MXene，以及无端基的 MXene。Gao 课题组 [41] [42] 引入其他端接基团，调 节表面端基类型以提高 MXene 的电化学性能。Li 课 题组 [43] 采用碘辅助蚀刻路线(图 2(a))制备无氟且富 氧端基的 MXene，在 1 mV• s −1 扫速下的比电容(293 [43] Fig. 2 Preparation method and electrochemical performance of iodine-containing terminated MXene [43] (a) Preparing strategy by Lewis-acid melt etching; (b) CV curves of I-Ti3C2…”