Multilayered Two‐Dimensional V<sub>2</sub>CT<sub>x</sub> MXene for Methane Dehydroaromatization

Thakur, Raj; Hoffman, Megan; VahidMohammadi, Armin; Smith, James Patterson; Chi, Mingyang; Tatarchuk, Bruce J.; Beidaghi, Majid; Carrero, Carlos A.

doi:10.1002/cctc.201902366

Cited by 36 publications

(18 citation statements)

References 34 publications

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“…Therefore, Tibased etching methods using LiF and HF are also effective for producing Nb and V-based MXenes. [13][14][15][16] The delaminated MXenes can be well dispersed in various polar solvents owing to the hydrophilic terminal groups, such as F and O, generated during MAX etching. Unlike the extensively studied carbon isotopes, such as carbon nanodots, carbon nanotubes (CNTs), and graphene, water, and polar organic solvents, including propylene carbonate (PC), dimethylformamide (DMF), and DMSO, can be excellent dispersion media for MXenes whose dispersion concentration outweighs those of nonpolar solvents (toluene, hexane, and dichlorobenzene) by a concentration of more than 0.3 mg mL −1 (Figure 3a,b).…”

Section: Synthesis and Properties Of Mxenementioning

confidence: 99%

Sensing with MXenes: Progress and Prospects

et al. 2021

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conventional technology is gradually reaching its limits in terms of further enhancement of sensor performance. Hence, tremendous efforts have been taken to explore the applicability of MXenes in various sensor technologies, including chemical, biological, mechanical, and optical sensors. The large specific surface area, high electrical conductivity, [1,2] and water dispersibility of MXenes, among their various excellent properties, constitute essential characteristics of a sensor material. Particularly, the 2D structure of MXene, which is conducive to functionalization using various terminal groups, provides a large number of active surface sites. These sites can serve as a highly responsive sensory platform for various external stimuli. Furthermore, the high electrical conductivity of MXenes is desirable for achieving low noise in sensory responses. Therefore, these characteristics demonstrate MXenes as a highly promising alternative sensor material for achieving high sensitivity, exceptionally low limit of detection (LOD), and minimum detectable amount of analytes in various sensor applications. Finally, the water dispersibility of MXenes facilitates environment-friendly fabrication and modification treatments; thus, they are further advantageous in processing.Because the fundamental properties of MXenes satisfy the requirements for an alternative sensor material, MXenebased sensor technology has been rapidly evolving over the last few years. The field of MXene-based sensors is facing conventional challenging problems as hurdles to commercialization: achieving reliably high performance, high stability, multifunctionality, and realizing homogeneous and reproducible scale-up processing (Figure 1a) of MXene-based sensors. Several recent studies on MXene-based sensors were aimed at establishing various structural and electrical approaches to utilize the excellent properties of MXene, thus boosting the sensor performance. For example, the macrostructuring of MXenes can significantly increase the sensitivity and lower the LOD of the resultant fabricated sensor. [3,4] Furthermore, the functionalization of MXene surfaces can impart useful properties of the secondary component to the MXene-based sensor to obtain higher performance than that of pristine MXenebased sensors. [5] These approaches have been highly effective and reliable, and thus significantly accelerated the progress of MXene-based sensor research. Figure 1b shows the network of co-occurring keywords in 2375 MXene-based research papers published since the discovery of MXenes in 2011. In an attempt to introduce new low-cost, high-performance, and Various fields of study consider MXene a revolutionary 2D material. Particularly in the field of sensors, the metal-like high electrical conductivity and large surface area of MXenes are desirable characteristics as an alternative sensor material that can transcend the boundaries of existing sensor technology. This critical review provides a comprehensive overview of recent advances in MXene-based sensor technology...

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Section: Synthesis and Properties Of Mxenementioning

confidence: 99%

Sensing with MXenes: Progress and Prospects

et al. 2021

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“…x -derived catalysts V 2 CT x is another commonly reported and used MXene material aer Ti 3 CT x . Thakur et al employed V 2 CT x in methane dehydroaromatization (MDA) to directly convert methane (CH 4 ) into benzene (C 6 H 6 ) at 700 C. 99 The catalyst showed a state-of-theart CH 4 conversion of 11.8% with a C 6 H 6 formation rate of 1.9 mmol g cat À1 h À1 at 700 C (Fig. 9a).…”

Section: Ctmentioning

confidence: 99%

“…The hydrogen treatment process of V 2 C T x was also investigated, in which the removal of T x groups occurred above 300 °C, and VO x species on its surface were reduced simultaneously. 126 Furthermore, the termination variation of V 2 C T x in inert and oxidative environments was also researched. The result was that N 2 -treated V 2 C T x was extremely stable even up to 600 °C, and only minor oxidation occurred on its surface.…”

Section: Mxenes As Catalystsmentioning

confidence: 99%

Two-dimensional carbide/nitride (MXene) materials in thermal catalysis

Yang

Zhang

et al. 2022

J. Mater. Chem. A

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“…However, in heterogeneous catalysis, they are less used [24]. MXenes were recently applied in water-gas shift reaction [25], dehydrogenation of propane and isobutene [26], nitrogen fixation [27], methane dehydroaromatisation [28], and oxidation reactions [29,30]. As far as we know, these are the only published thermocatalytic applications.…”

Section: Introductionmentioning

confidence: 99%

Enhancing catalytic epoxide ring-opening selectivity using surface-modified Ti₃C₂T _x MXenes

et al. 2021

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MXenes are a new family of two-dimensional carbides and/or nitrides. Their 2D surfaces are typically terminated by O, OH and/or F atoms. Here we show that Ti 3 C 2 T x -the most studied compound of the MXene family-is a good acid catalyst, thanks to the surface acid functionalities. We demonstrate this by applying Ti 3 C 2 T x in the epoxide ring-opening reaction of styrene oxide (SO) and its isomerization in the liquid phase. Modifying the MXene surface changes the catalytic activity and selectivity. By oxidizing the surface, we succeeded in controlling the type and number of acid sites and thereby improving the yield of the mono-alkylated product to >80%. Characterisation studies show that a thin oxide layer, which forms directly on the Ti 3 C 2 T x surface, is essential for catalysing the SO ring-opening. We hypothesize that two kinds of acid sites are responsible for this catalysis: In the MXene, strong acid sites (both Lewis and Brønsted) catalyse both the ring-opening and the isomerization reactions, while in the Mxene-TiO 2 composite weaker acid sites catalyse only the ring-opening reaction, increasing the selectivity to the mono-alkylated product.

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Multilayered Two‐Dimensional V₂CT_x MXene for Methane Dehydroaromatization

Cited by 36 publications

References 34 publications

Sensing with MXenes: Progress and Prospects

Sensing with MXenes: Progress and Prospects

Two-dimensional carbide/nitride (MXene) materials in thermal catalysis

Enhancing catalytic epoxide ring-opening selectivity using surface-modified Ti₃C₂T _x MXenes

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Multilayered Two‐Dimensional V2CTx MXene for Methane Dehydroaromatization

Cited by 36 publications

References 34 publications

Sensing with MXenes: Progress and Prospects

Sensing with MXenes: Progress and Prospects

Two-dimensional carbide/nitride (MXene) materials in thermal catalysis

Enhancing catalytic epoxide ring-opening selectivity using surface-modified Ti3C2T x MXenes

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Product

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Multilayered Two‐Dimensional V₂CT_x MXene for Methane Dehydroaromatization

Enhancing catalytic epoxide ring-opening selectivity using surface-modified Ti₃C₂T _x MXenes