Layer-by-layer self-assembly of pillared two-dimensional multilayers

Tian, Weiqian; VahidMohammadi, Armin; Wang, Zhen; Ouyang, Liangqi; Beidaghi, Majid; Hamedi, Mahiar

doi:10.1038/s41467-019-10631-0

Cited by 190 publications

(167 citation statements)

References 49 publications

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“…As shown from the Ragone plot in Figure d, impressively, the MCFs nanomaterials‐based SC displays the maximum energy density of 147.5 mWh cm −3 at a power density of 0.15 W cm −3 , and energy density can be still maintained 94.1 mWh cm −3 at a higher power density of 15 W cm −3 . To the best of our knowledge, the energy density value is evidently one of the best levels among flexible SCs, including commercial Li thin‐film battery, graphene of 2.5 mWh cm −3 , Mxene of 5.1 mWh cm −3 , CNT/graphene of 6.3 mWh cm −3 , porous carbon of 8.4 mWh cm −3 , MnO 2 /carbon cloth of 8.25 mWh cm −3 , polyaniline/graphene of 8.8 mWh cm −3 and MnOx/TiN nanowires/carbon nanotube of 61.2 mWh cm −3 .…”

Section: Resultsmentioning

confidence: 99%

Hierarchical Micro‐Mesoporous Carbon‐Framework‐Based Hybrid Nanofibres for High‐Density Capacitive Energy Storage

Meng

Chen

2019

Angewandte Chemie

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Advanced methods, allowing the controllable synthesis of ordered structural nanomaterials with favourable charges transfer and storage, are highly important to achieve ideal supercapacitors with high energy density. Herein, we report a microliter droplet‐based method to synthesize hierarchical‐structured metal–organic framework/graphene/carbon nanotubes hybrids. The confined ultra‐small‐volume reaction, give well‐defined hybrids with a large specific‐surface‐area (1206 m2 g−1), abundant ionic‐channels (narrow pore of 0.86 nm), and nitrogen active‐sites (10.63 %), resulting in high pore‐size utilization (97.9 %) and redox‐activity (32.3 %). We also propose a scalable microfluidic‐blow‐spinning method to consecutively generate nanofibre‐based flexible supercapacitor electrodes with striking flexibility and mechanical strength. The supercapacitors display large volumetric energy density (147.5 mWh cm−3), high specific capacitance (472 F cm−3) and stably deformable energy‐supply.

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Section: Resultsmentioning

confidence: 99%

Hierarchical Micro‐Mesoporous Carbon‐Framework‐Based Hybrid Nanofibres for High‐Density Capacitive Energy Storage

Meng

Chen

2019

Angewandte Chemie

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“…Xu et al have reported the preintercalation of CTAB into Ti 3 C 2 T x to realize the reversible insertion of Mg 2+ , thus achieving excellent volumetric performance and rate capability for magnesium ion batteries, and this indicates the possible wide use of surfactant preintercalation in the field of energy conversion and storage 72. In addition to the surfactants, small molecules like tris(2‐aminoethyl) amine (TAEA) was also reported as the interlayer pillaring component for the layer‐by‐layer self‐assembly of Ti 3 C 2 T x MXene 73…”

Section: The Mxene Assembliesmentioning

confidence: 99%

The Assembly of MXenes from 2D to 3D

et al. 2020

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MXenes can be denoted with the formula M n+1 X n T x (n 1-3), where M is an early transition metal (Sc, Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, or W), X is carbon and/or nitrogen, and T x stands for a surface functional group (O, OH, and/or F, etc.). [8] MXenes have a lattice with hexagonal lattice symmetry inherited from their parent MAX phase and have a superior electrical conductivity (6000-8000 S cm −1 ) due to their metallic backbone. [1,8] Abundant surface functional groups provide a large number of active sites on the surface of MXenes, and this has tremendous potential for surface modification and the highly efficient loading of active substances. [9][10][11][12] Additionally, MXenes have good thermal conductivity, [6] a tunable bandgap and excellent mechanical strength, [13,14] thus having great prospects in the fields of energy conversion and storage, [15][16][17] electromagnetic interference (EMI) shielding and absorption, [18][19][20] sensing, [21,22] environmental protection, and so on. [23,24] However, similar to other 2D materials, MXenes also have a propensity for "face to face" stacking and aggregation due to strong van der Waals forces, which greatly limits their performance in practical applications. [25,26] Recently, to address the stacking problem for a high surface utilization and obtain functional MXene materials with well-tailored structures, intense efforts from different aspects, such as surface modification, [27] heteroatom doping, [28] buckling and crumpling, [29][30][31][32] introducing interlayer spacers, [33] templating, [34] and crosslinking [35] have been made.Ways of assembling MXenes into 3D structures at the macro and/or microlevel are greatly needed to overcome the restacking problem of 2D materials, and have been extensively studied. [18,36,37] The 2D MXene nanosheets can be used as building blocks to construct MXene assemblies with desired structures by well-designed methods. Their excellent properties are expected to be inherited by the assemblies, thus essentially expanding their applications. Hence, there is a great need to summarize recent progress in the design of MXene assemblies for diverse applications.Previously, several reviews on the synthesis, properties, and applications of MXenes have been published. [8,15,25,[38][39][40][41] However, none of them have summarized the latest advances on MXene from an assembly perspective. A timely and focused progress report of MXene assemblies is expected to further accelerate the development of these emerging materials and promote their applications. Here, recent efforts on MXene assemblies and the corresponding assembly strategies are reviewed. To facilitate the discussion, the assemblies are classified into three categories according to their dimensional structures at the macro and/ or microlevels. These are, 2D assemblies, 2D macroassemblies Since their discovery in 2011, transition metal carbides or nitrides (MXenes) have attracted a wide range of attention due to their unique properties and promise for use in a variety of appl...

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“…This system achieved a specific capacitance of 370 F g À1 at 2 mV s À1 and retained more than 86% over 10,000 cycles (at a specific current of 3 A g À1 ), a great improvement compared with the non-LbL control systems (Table 1). 71 It was later demonstrated that a multilayered system of MXene and multiwall carbon nanotubes (MWCNT) could be prepared by spray-LbL assembly on polycaprolactone (PCL) substrates. 30 PEI was grafted onto the MWCNT to impart a positive charge to oppose the negative Ti 3 C 2 T x , enabling LbL assembly.…”

Section: Reviewmentioning

confidence: 99%

“…30 LbL-assembled Ti 3 C 2 T x MXene composite films exhibit lower conductivities than pure Ti 3 C 2 T x MXene films due to the presence of relatively thick layers of insulating polymers between the MXene flakes introduced during the LbL process. To improve the conductivity of LbL Ti 3 C 2 T x MXene composite films, Tian et al used positively charged tris(2-aminoethyl)amine small molecules rather than polymers to reduce the interlayer spacing of the MXene flakes and achieved a high conductivity (7.3 3 10 4 S m À1 ) for this LbL composite film, 71 although still below the reported value for pristine Ti 3 C 2 T x MXene films (8 3 10 5 S m À1 ). 7 Nevertheless, the relatively high conductivity of the film resulted in superior volumetric capacitance and capacitive rate capability as compared with PEI/MXene LbL films (Table 1).…”

Section: Reviewmentioning

confidence: 99%