A MXene-based EDA-Ti3C2Tx intercalation compound with expanded interlayer spacing as high performance supercapacitor electrode material

Xu, Peng; Xiao, Hong; Liang, Xiao; Zhang, Tengfei; Zhang, Fanchao; Liu, Chenhao; Lang, Beibei; Gao, Qiuming

doi:10.1016/j.carbon.2020.11.010

Cited by 50 publications

(18 citation statements)

References 47 publications

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“…The electrochemical measurements were carried out in a three-electrode setup under the potential window of -0.9 ~ -0.1 V in 1 M Na2SO4. Electrochemical techniques such as cyclic voltammetry (CV), galvanostatic charge and discharge (GCD) and electrochemical impedance spectroscopy (EIS) were applied at room temperature (~25℃) [12] .…”

Section: Characterization and Electrochemical Analysismentioning

confidence: 99%

The Synthesis of High-Quality V2C as Electrode Material for Supercapacitors

Wangsheng¹,

Yuan²

2022

Preprint

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Section: Characterization and Electrochemical Analysismentioning

confidence: 99%

The Synthesis of High-Quality V2C as Electrode Material for Supercapacitors

Wangsheng¹,

Yuan²

2022

Preprint

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“…These multilayered sheets require additional delamination and functionalization to produce few-layered MXene sheets with the desired properties . Several reports on surface modification strategies for MXene for diverse applications, including polymer composites, have been published. − The hydrophilic nature of MXenes, particularly Ti 3 C 2 , improves their dispersibility in solvents and causes surface oxidation, leading to the formation of TiO 2 . Many factors such as the storage conditions, morphology, structure, temperature, and solvent affect the stability of the MXene sheets.…”

Section: Introductionmentioning

confidence: 99%

Curing Behavior and Mechanical Properties of Tetra-Functional Epoxy Reinforced with Polyethyleneimine-Functionalized MXene

Wazalwar

Tripathi

Raichur

2022

ACS Appl. Polym. Mater.

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The aerospace industry has started shifting toward polymer composites, especially epoxy-based composites. Because epoxy is inherently brittle, it must be suitably reinforced to enhance its fracture properties and make it suitable for aerospace applications. In this regard, we studied surface-modified Ti 3 C 2 nanosheets as toughening agents for aerospace-grade epoxy composites. Ti 3 C 2 T x (T = O, OH, and F) nanosheets were synthesized by acid etching of the Ti 3 AlC 2 precursor and further functionalized with polyethyleneimine (PEI) to improve their degree of exfoliation and enhance their degree of interaction with the epoxy matrix. Epoxy composites containing 0.1, 0.5, and 1.0 wt % PEI−Ti 3 C 2 T x nanosheets were synthesized. These composites were studied for their curing behavior and mechanical properties. The isoconversional Starink method was used to calculate the curing activation energy. Compared to neat epoxy, the PEI−Ti 3 C 2 T x nanosheets showed a catalytic effect on curing by lowering the curing activation energy. A 40% higher compressive strength was observed in 0.5 wt % PEI−Ti 3 C 2 T x /epoxy composites, compared to neat epoxy. The K IC and G IC of the 0.5 wt % PEI−Ti 3 C 2 T x /epoxy composite were 70 and 140% higher than those of neat epoxy, respectively. The fracture properties improved due to crack deflection, crack blunting, and enhanced filler−matrix interaction. At 1.0 wt % PEI−Ti 3 C 2 T x loading, the nanosheets began agglomerating, which caused a reduction in the mechanical properties. The storage modulus and T g of the PEI− Ti 3 C 2 T x /epoxy composites were also significantly higher than those of neat epoxy. It was observed that blank Ti 3 C 2 T x did not cause a remarkable improvement in the properties of epoxy composites. Hence, PEI functionalization was instrumental in achieving uniform filler dispersion and favorable filler−matrix interaction.

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“…The MXene family shows the typical general structure M ( m +1) X n T x , where T represents the terminal functional group on the surface of MXene, including hydroxyl (−OH), fluorine (−F), and chlorine (−Cl) . In the MXene family, Ti 3 C 2 T x has been mainly studied in the field of lithium metal batteries, electromagnetic wave absorption, supercapacitors, and so on owing to its excellent electrical conductivity and mechanical flexibility . Compared with traditional electrode materials, the delaminated MXene nanosheets not only have excellent flexibility, which can be designed into various nanostructures, but also provide chemical affinity owing to their abundant terminal functional groups. , Gogotsi et al successfully prepared MXene into a hollow macroporous three-dimensional (3D) framework for sodium-ion batteries by a templating method, which obtained excellent capacity, rate capability, and cycling stability .…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Macroporous TiO₂-MXene Nanostructure-Based Films for Flexible Freestanding Sulfur Cathodes

Zhang

Shi

et al. 2022

ACS Appl. Nano Mater.

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Flexible freestanding electrodes with high energy density and good cycling stability are of great importance for wearable devices. Lithium−sulfur battery is considered a promising next-generation energy storage system owing to its high theoretical energy density and low production cost. However, several issues such as the severe polysulfide shuttle effect, poor electrical conductivity, and drastic volume change of sulfur cathodes hindered the commercialization of lithium−sulfur batteries. To solve these problems, many recent studies have focused on a class of two-dimensional (2D) MXene nanomaterials with abundant surface functional groups and excellent mechanical flexibility. Although these unique MXene nanomaterials have chemical affinity and are easily designed into various nanostructures, the inevitable overlap of the nanosheets can impair their electrochemical performance. Herein, we develop a three-dimensional (3D) macroporous TiO 2 -MXene nanostructure-based film for the flexible freestanding sulfur cathode in this paper. Such structure can realize a dual-confined strategy for polysulfides, that is, physical barrier and chemical absorption. The hollow porous MXene nanostructure can physically inhibit the polysulfide shuttle effect. And the TiO 2 nanoparticles on the surface of MXene can effectively anchor and catalyze polysulfides in the electrochemical reaction. Moreover, the 3D conductive MXene network can provide fast electronic pathways, which promote the electrochemical reaction and reduce the electrochemical polarization. Without adding additional binders and conductive agents, the 3D macroporous TiO 2 -MXene freestanding nanostructure-based film S@TiO 2 -Ti 3 C 2 O x shows good electrochemical performances with a specific capacity of 1022.7 and 523.7 mAh/g at 0.1 and 1C, respectively. This work provides a possible application of lithium−sulfur batteries in the field of flexible electronic devices.

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A MXene-based EDA-Ti3C2Tx intercalation compound with expanded interlayer spacing as high performance supercapacitor electrode material

Cited by 50 publications

References 47 publications

The Synthesis of High-Quality V2C as Electrode Material for Supercapacitors

The Synthesis of High-Quality V2C as Electrode Material for Supercapacitors

Curing Behavior and Mechanical Properties of Tetra-Functional Epoxy Reinforced with Polyethyleneimine-Functionalized MXene

Three-Dimensional Macroporous TiO₂-MXene Nanostructure-Based Films for Flexible Freestanding Sulfur Cathodes

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A MXene-based EDA-Ti3C2Tx intercalation compound with expanded interlayer spacing as high performance supercapacitor electrode material

Cited by 50 publications

References 47 publications

The Synthesis of High-Quality V2C as Electrode Material for Supercapacitors

The Synthesis of High-Quality V2C as Electrode Material for Supercapacitors

Curing Behavior and Mechanical Properties of Tetra-Functional Epoxy Reinforced with Polyethyleneimine-Functionalized MXene

Three-Dimensional Macroporous TiO2-MXene Nanostructure-Based Films for Flexible Freestanding Sulfur Cathodes

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Product

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Three-Dimensional Macroporous TiO₂-MXene Nanostructure-Based Films for Flexible Freestanding Sulfur Cathodes