Achieving Macroscopic V4C3Tx MXene by Selectively Etching Al from V4AlC3 Single Crystals

Wang, Dong; G., J.; Lin, Shuai; Zhang, Ranran; Huang, Yanan; Yang, Jie; Lu, W. J.; Zhu, Xuebin; Sun, Yan

doi:10.1021/acs.inorgchem.9b03625

Cited by 40 publications

(27 citation statements)

References 63 publications

(116 reference statements)

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“…The slow degradation rate of Al–Ti 3 C 2 indicates that the surfaces of the Al–Ti 3 C 2 flakes contain relatively few points for degradation to occur. However, more in-depth studies will be needed to determine the exact mechanism of how using excess aluminum, or other molten fluxes, during MAX phase synthesis affects the atomic structure, composition, and growth of MAX phases. , However, even without a complete understanding of the exact origin of the dramatic improvement in the stability of Al–Ti 3 C 2 , the results presented in this study will allow the MXene community to begin utilizing highly stable MXenes.…”

Section: Resultsmentioning

confidence: 99%

Modified MAX Phase Synthesis for Environmentally Stable and Highly Conductive Ti₃C₂ MXene

et al. 2021

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Section: Resultsmentioning

confidence: 99%

Modified MAX Phase Synthesis for Environmentally Stable and Highly Conductive Ti₃C₂ MXene

et al. 2021

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“…As shown in Figure , c -LP data for various MXenes are summarized. The general principles in c -LP data that applied for all MXenes are proposed as follows: (i) interlayer spacing of MAX phases increases with the layers of ETMs ( n ) and after HF etching it further expands to a larger value (Δ c -LP ≈ 4–6 Å), which suggests the intercalation of H 2 O molecules; ,,− ,,− (ii) intercalation of larger guest molecules such as TBA + and isopropylamine results in greater expansion of the layered MXenes henceforth further weakening of interlayer interactions; ,,, (iii) restacked MXene papers from delaminated dispersions are usually characterized by the existence of intercalants introduced from the exfoliation step (which is discussed later in this review). − ,,, …”

Section: Physics and Chemistry Of Intercalation Reactions In Mxenesmentioning

confidence: 99%

“… c -LP data reported for different MAX phases, HF-etched multilayer MXenes, AC-intercalated multilayer MXenes, metal cations intercalated multilayer MXenes, and MXene papers (restacked). If not specified, the symbols reflect the c -LP of compositions shown in the brackets for MAX phase, AC intercalation, and metal cations intercalation. ,,− ,,,,− …”

Section: Physics and Chemistry Of Intercalation Reactions In Mxenesmentioning

confidence: 99%

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Host–Guest Intercalation Chemistry in MXenes and Its Implications for Practical Applications

Chen

2021

ACS Nano

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The ever-increasing demand on developing layered materials for practical applications, such as electrochemical energy storage, responsive materials, nanofluidics, and environmental remediation, requires the profound understanding and artful exploitation of interlayer engineering or intercalation chemistry. The past decade has witnessed the massive exploration of a recently discovered 2D materialtransition metal carbides, carbonitrides, and nitrides (referred to as MXenes), which began to take hold of a myriad of applications owing to the abundant possibilities on their compositions and intercalation states. However, application-targeted manipulation of the material performance of MXenes is constrained by the dearth of deep comprehension on fundamental intercalation chemistry/physics. To this end, the aim of this review is to provide a holistic discussion on the intercalation chemistry in MXenes and the physical properties of MXene intercalation compounds. On the basis of this, potential solutions for the challenges confronted in the synthesis, tuning of material properties, and practical applications are proposed, which are also expected to reinvigorate the exploration of layered materials that are similar to MXenes.

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“…[29] Recently, multi-layered V 4 C 3 T x MXene has been successfully fabricated and used as the electrode for supercapacitors, in which the electrode for multi-layered V 4 C 3 T x MXene was prepared by using the binder in general. [17,28,30,31] However, the compactly stacked layers and the use of binders are detrimental to facilitating electron transport and ion diffusion, and decrease the available active sites for redox reaction. It hinders the improvement of The compactly stacked layers and the use of binders are detrimental to the rate performance and long cycle stability for V 4 C 3 T x MXene.…”

mentioning

confidence: 99%

Self‐Assembling Delaminated V₄C₃T_x MXene into Highly Stable Pseudocapacitive Flexible Film Electrode for Supercapacitors

Bin

Sheng

Luo

et al. 2022

Adv Materials Inter

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MXene is well known as an emerging 2D layered material, which was first reported by the group of Gogotsi in 2011. [4] Due to the unique physical/chemical properties, MXene has been widely applied for a variety of fields, such as energy storage and conversion, [5][6][7] water purification, [8,9] catalysis, [10] electromagnetism interference shielding, [11,12] sensor, [13] and biomedicine. [14] Especially, MXene has already shown great potential as an electrode material in supercapacitors. [15,16] To date, more and more new members were added to the MXene family, with at least 30. [17] Generally, MXenes are fabricated by the selectively etching the "A" layers from the MAX ceramics phases. The general chemical formula of MAX is M n+1 AX n (n = 1, 2, 3), including M 2 AX 1 , M 3 AX 2 , M 4 AX 3 , labeled as 211, 312, 413 phases, respectively. And the general formula of MXene is M n+1 X n T x (n = 1, 2, 3), where M represents a transition metal, A is for a group of IIIA or IVA elements, X stands for C and/or N, T x is for the surface functional groups, such as O, OH, and/or F. Therefore, MXene exhibits outstanding metallic conductivity, abundant chemical surface, and good hydrophilic. [16,18,19] In 2013, Lukatskaya et al. successfully prepared the flexibility of Ti 3 C 2 T x paper, opening the door for the MXenes in flexible devices application. [18] Subsequently, numerous studies are concentrated on titanium carbide (Ti 3 C 2 T x ) MXene. [5,7,15,20,21] However, more recent attention has been attracted by vanadium carbide MXene with abundant valence states. Actually, vanadium carbide MXene also becomes a popular and promising candidate material for supercapacitors, because the variable valence states of vanadium (V) element can contribute to electrochemical performance. [22,23] Whereas, V 2 CT x is prone to oxidation, [24] and it was reported that MXenes (M n+1 X n T x ) become more stable with increasing n. Thus, V 4 C 3 T x should be more worth to be explored. [17,[25][26][27][28] In 2007, Hu et al. discovered the V 4 AlC 3 MAX ceramic phase for the first time. [29] Recently, multi-layered V 4 C 3 T x MXene has been successfully fabricated and used as the electrode for supercapacitors, in which the electrode for multi-layered V 4 C 3 T x MXene was prepared by using the binder in general. [17,28,30,31] However, the compactly stacked layers and the use of binders are detrimental to facilitating electron transport and ion diffusion, and decrease the available active sites for redox reaction. It hinders the improvement of The compactly stacked layers and the use of binders are detrimental to the rate performance and long cycle stability for V 4 C 3 T x MXene. To solve this problem and add a new member to flexible electrodes, the multi-layered V 4 C 3 T x MXene is delaminated into nanoflakes (d-V 4 C 3 T x ) with tetra-nbutylammonium hydroxide (TBAOH) and self-assembled into the flexible film without binder. The d-V 4 C 3 T x film as a negative electrode delivers a high specific capacitance of 292.0 F g -1 (622.4 F c...

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Achieving Macroscopic V₄C₃T_x MXene by Selectively Etching Al from V₄AlC₃ Single Crystals

Cited by 40 publications

References 63 publications

Modified MAX Phase Synthesis for Environmentally Stable and Highly Conductive Ti₃C₂ MXene

Modified MAX Phase Synthesis for Environmentally Stable and Highly Conductive Ti₃C₂ MXene

Host–Guest Intercalation Chemistry in MXenes and Its Implications for Practical Applications

Self‐Assembling Delaminated V₄C₃T_x MXene into Highly Stable Pseudocapacitive Flexible Film Electrode for Supercapacitors

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Achieving Macroscopic V4C3Tx MXene by Selectively Etching Al from V4AlC3 Single Crystals

Cited by 40 publications

References 63 publications

Modified MAX Phase Synthesis for Environmentally Stable and Highly Conductive Ti3C2 MXene

Modified MAX Phase Synthesis for Environmentally Stable and Highly Conductive Ti3C2 MXene

Host–Guest Intercalation Chemistry in MXenes and Its Implications for Practical Applications

Self‐Assembling Delaminated V4C3Tx MXene into Highly Stable Pseudocapacitive Flexible Film Electrode for Supercapacitors

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Product

Resources

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Achieving Macroscopic V₄C₃T_x MXene by Selectively Etching Al from V₄AlC₃ Single Crystals

Modified MAX Phase Synthesis for Environmentally Stable and Highly Conductive Ti₃C₂ MXene

Modified MAX Phase Synthesis for Environmentally Stable and Highly Conductive Ti₃C₂ MXene

Self‐Assembling Delaminated V₄C₃T_x MXene into Highly Stable Pseudocapacitive Flexible Film Electrode for Supercapacitors