2D Titanium Carbide (MXene) Based Films: Expanding the Frontier of Functional Film Materials

Li, Guohao; Wyatt, Brian C.; Song, Fei; Yu, Changqiang; Wu, Zhenjun; Xie, Xiuqiang; Anasori, Babak; Zhang, Nan

doi:10.1002/adfm.202105043

Cited by 55 publications

(28 citation statements)

References 218 publications

(462 reference statements)

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“…Aqueous MXene solution has excellent dispersibility and processability and can produce composite films by means of filtration, deposition, etc . Some researchers obtained the films by allowing the MXenes to settle naturally through direct drying or vacuum drying . Alternatively, the films can be prepared by filtration, in which most of the water is removed and then the film is dried to improve the degree of binding between the materials. − In this process, the bonding force between materials is first strengthened by a vacuum force, and then the deposition force generated by water evaporation is used to obtain the composite film with a strong interface effect.…”

Section: Methods For Preparing Mxene Series Flexible Pressure Sensorsmentioning

confidence: 99%

Recent Progress in Ti₃C₂T_x MXene-Based Flexible Pressure Sensors

Wei

Tang

et al. 2021

ACS Nano

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The rapid development of consumer electronics, artificial intelligence, and clinical medicine generates an increasing demand for flexible pressure sensors, whose performance depends significantly on sensitive materials with high flexibility and proper conductivity. MXene, a type of 2D nanomaterial, has attracted extensive attention due to its good electrical conductivity, hydrophilicity, and flexibility. The synthesis methods for MXenes make it relatively easy to control their microstructure and surface termination groups. Hence, MXenes can obtain peculiar microstructures and facilely combine with other functional materials, making them promising prospects for use in flexible pressure sensors. In this Review, recent advances in MXenes are summarized, mainly focusing on the synthesis methods and their application in flexible pressure sensors. Finally, the challenges and potential solutions for future development are also discussed.

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Section: Methods For Preparing Mxene Series Flexible Pressure Sensorsmentioning

confidence: 99%

Recent Progress in Ti₃C₂T_x MXene-Based Flexible Pressure Sensors

Wei

Tang

et al. 2021

ACS Nano

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“…Therefore, tremendous efforts aggregate or restack owning to the van der Waals interactions between layers, which seriously deteriorates the intrinsic electrochemical performance and accessibility to electrolyte ions. [20] As proved by Ren et al, [21] the interlayer distance of dried pure Ti 3 C 2 T x film is about 4.7 Å, which is comparative to the Stokes radii of Na + in propylene carbonate (4.6 Å), [22] thereby resulting in the unsatisfied surface accessibility. To make better use of Ti 3 C 2 T x -based electrode materials for ESS, several strategies have been developed to prevent the self-restacking issue.…”

Section: Introductionmentioning

confidence: 94%

Surface Chemistry and Mesopore Dual Regulation by Sulfur‐Promised High Volumetric Capacity of Ti₃C₂T_x Films for Sodium‐Ion Storage

Lian

Song

et al. 2021

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have been devoted to developing anode materials with desirable electronic and ionic transport properties for ESS. A popular strategy is to prepare nanosized materials to afford more accessible active sites and shorter diffusion path for both Na + and electrons, thereby effectively enhancing the electrochemical performances such as specific capacity and rate capability of anode materials. [1] Notably, the nanosized electrode materials generally have low compact densities, thereby critically limiting the volumetric capacity of the electrode. With the dramatic development of the electronic technology, volumetric capacity has become the most relevant merit for applications where size matters, such as large-scale stationary energy storage and wearable electronics. Therefore, high-volumetric-capacity anode materials, with flexibility and good cycling stability for better, are still highly desirable for ESS.MXenes are a family of 2D transition metal carbides and/or nitrides with a general formula M n+1 X n T x , where M is an early transition metals, X is C and/or N, T x is the surface terminations including OH, F, and O, and n is usually 1-4. [2][3][4][5][6] Due to the unique layered structure, superhigh conductivity (>20 000 S cm −1 ), [7] tunable physical and chemical properties, Ti 3 C 2 T x MXene has become promising candidates for many applications. [8][9][10][11][12] Especially in ESS, [13,14] Ti 3 C 2 T x shows tremendous potential with many attracting figure of merits. [15] For example, computational results have demonstrated that the Na + diffusion barrier on the surface of Ti 3 C 2 T x is relatively low (0.1-0.2 eV), contributing to faster charge transfer. [16,17] Furthermore, modeling and experimental investigations suggest that the process of sodiation/desodiation between the Ti 3 C 2 T x layers is electrochemically reversible. [18,19] These characteristics make Ti 3 C 2 T x a suitable candidate for ESS. When it assembles into film, Ti 3 C 2 T x can be directly applied as a freestanding electrode for ESS without using conductive agents, polymeric binders as well as metal current collectors. This process highly decreases the "dead volume" caused by the noncapacity contribution additive, further unleashing the potential of Ti 3 C 2 T x for high-volumetric-capacity ESS. However, similar to other 2D nanomaterials, Ti 3 C 2 T x sheets have a strong tendency to Electrochemical sodium-ion storage has come out as a promising technology for energy storage, where the development of electrode material that affords high volumetric capacity and long-term cycling stability remains highly desired yet a challenge. Herein, Ti 3 C 2 T x (MXene)-based films are prepared by using sulfur (S) as the mediator to modulate the surface chemistry and microstructure, generating S-doped mesoporous Ti 3 C 2 T x films with high flexibility. The mesoporous architecture offers desirable surface accessibility without significantly sacrificing the high density of Ti 3 C 2 T x film. Meanwhile, the surface sulfur doping of Ti 3 C 2 T x favo...

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“…Besides directly using HF, another more safe method is to make use of the reaction between hydrochloric acid (HCl) and uoride salt (such as lithium uoride (LiF)) to produce the in situ HF as the etching agent. 154,183,184 In addition, some researchers have used the salt template method 185 and gas-phase method 186 to synthesize 2D carbides and nitrides with MXene-like structures. HF concentration and reaction time directly affect the morphology and structure of MXene akes.…”

Section: D Homostructure Electrode Materialsmentioning

confidence: 99%