Intercalation and surface modification of two-dimensional transition metal carbonitride Ti3CNTx for ultrafast supercapacitors

Xu, Shuaikai; Li, Zhemin; Wei, Guodong; Wang, Yuanhao; Yang, Ya

doi:10.1039/d2ta04962g

Cited by 18 publications

(2 citation statements)

References 35 publications

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“…The A-M/BC-0.2-based SSC shows a maximum areal energy density of 13.38 μWh cm −2 at a power density of 347.37 μW cm −2 and retains the areal energy density of 11.44 μWh cm −2 when the power density increases to 7537.13 μW cm −2 (Figure S19). The A-M/BC-0.2-based SSC has a gravimetric energy density of 9.63 Wh kg −1 at a power density of 250 W kg −1 , which is comparable to or higher than other MXene-based SCs, such as the MXene/rGO (10.5 Wh kg −1 at 80.3 W kg −1 ), 55 MnO 2 /Ti 3 C 2 T x hybrid film (8.3 Wh kg −1 at 221.33 W kg −1 ), 56 MXene//MnO 2 (6.4 Wh kg −1 at 1107.7 W kg −1 ), 57 MXene/CNTs (2.77 Wh kg −1 at 311 W kg −1 ), 58 porous Ti 3 C 2 T x /CNTs film (9.2 Wh kg −1 at 96.1 W kg −1 ), 59 Ti 3 C 2 T x /Nb 2 CT x (5.7 Wh kg −1 at 172.5 W kg −1 ), 60 300−K− Ag-Ti 3 CNT x (7.3 Wh kg −1 at 350 W kg −1 ), 61 and N−Ti 3 C 2 T x (9.57 Wh kg −1 at 250 W kg −1 ). 62 Furthermore, the energy density could be maintained at 8.23 Wh kg −1 even when the power density reaches 5424.45 W kg −1 (Figure 7d).…”

Section: Resultsmentioning

confidence: 99%

Regulating Functional Groups Enhances the Performance of Flexible Microporous MXene/Bacterial Cellulose Electrodes in Supercapacitors

Luo,

Que,

Tang

et al. 2024

ACS Nano

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Ultrathin MXene-based films exhibit superior conductivity and high capacitance, showing promise as electrodes for flexible supercapacitors. This work describes a simple method to enhance the performance of MXene-based supercapacitors by expanding and stabilizing the interlayer space between MXene flakes while controlling the functional groups to improve the conductivity. Ti 3 C 2 T x MXene flakes are treated with bacterial cellulose (BC) and NaOH to form a composite MXene/BC (A-M/BC) electrode with a microporous interlayer and high surface area (62.47 m 2 g −1 ). Annealing the films at low temperature partially carbonizes BC, increasing the overall electrical conductivity of the films. Improvement in conductivity is also attributed to the reduction of −F, −Cl, and −OH functional groups, leaving −Na and −O functional groups on the surface. As a result, the A-M/BC electrode demonstrates a capacitance of 594 F g −1 at a current density of 1 A g −1 in 3 M H 2 SO 4 , which represents a ∼2× increase over similarly processed films without BC (309 F g −1 ) or pure MXene (298 F g −1 ). The corresponding device has an energy density of 9.63 Wh kg −1 at a power density of 250 W kg −1 . BC is inexpensive and enhances the overall performance of MXene-based film electrodes in electronic devices. This method underscores the importance of functional group regulation in enhancing MXenebased materials for energy storage.

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Section: Resultsmentioning

confidence: 99%

Regulating Functional Groups Enhances the Performance of Flexible Microporous MXene/Bacterial Cellulose Electrodes in Supercapacitors

Luo,

Que,

Tang

et al. 2024

ACS Nano

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“…Briefly, etching with LiF and HCl solution introduced −F and −Cl functional groups on the MXene surface; however, KOH treatment removed most of these functional groups and introduced more −OH functional groups. Next, the nanosheets underwent calcination under a nitrogen atmosphere at 400 °C for 2 h to further modify the surface functional groups, 37 yielding MXene-K. Subsequently, CNTs and few-layer MXene nanosheet dispersion liquids were mixed and submitted to the same alkaline treatment to form MXene-K-nCNT composite materials with a self-assembled structure.…”

Section: Resultsmentioning

confidence: 99%

Potassium Ion–Assisted Self–Assembled MXene-K-CNT Composite as High–Quality Sulfur–Loaded Hosts for Lithium–Sulfur Batteries

Li,

Yang,

Xie

et al. 2024

ACS Appl. Mater. Interfaces

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We successfully synthesized hybrid MXene-K-CNT composites composed of alkalized two-dimensional (2D) metal carbide and carbon nanotubes (CNTs), which were employed as host materials for lithium−sulfur (Li−S) battery cathodes. The unique three-dimensional (3D) intercalated structure through electrostatic interactions by K + ions in conjunction with the scaffolding effect provided by CNTs effectively inhibited the selfstacking of MXene nanosheets, resulting in an enhanced specific surface area (SSA) and ion transport capability. Moreover, the addition of CNTs and in situ−grown TiO 2 considerably improved the conductivity of the cathode material. K + ion etching created a more hierarchical porous structure in MXene, which further enhanced the SSA. The 3D framework effectively confined S embedded between nanosheet layers and suppressed volume changes of the cathode composite during charging/discharging processes. This combination of CNTs and alkalized nanosheets functioned as a physical and chemical dual adsorption system for lithium polysulfides (LiPSs). When subjected to a high current at 1.0C,

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Ag decorated 3D honeycomb-like MXene architecture as an advanced lithium-ion anode material towards high capacity and long-term cycle capability

Wang

Duan

Zhou

et al. 2023

Applied Surface Science

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Intercalation and surface modification of two-dimensional transition metal carbonitride Ti₃CNT_x for ultrafast supercapacitors

Abstract: MXenes have been promising supercapacitor electrodes due to their two-dimension structure and electrochemically active surface. As a member of MXenes, Ti3CNTx is a transition metal carbonitride with a similar structure...

Cited by 18 publications

References 35 publications

Regulating Functional Groups Enhances the Performance of Flexible Microporous MXene/Bacterial Cellulose Electrodes in Supercapacitors

Regulating Functional Groups Enhances the Performance of Flexible Microporous MXene/Bacterial Cellulose Electrodes in Supercapacitors

Potassium Ion–Assisted Self–Assembled MXene-K-CNT Composite as High–Quality Sulfur–Loaded Hosts for Lithium–Sulfur Batteries

Ag decorated 3D honeycomb-like MXene architecture as an advanced lithium-ion anode material towards high capacity and long-term cycle capability

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