Electrons/ions dual transport channels design: Concurrently tuning interlayer conductivity and space within re-stacked few-layered MXenes film electrodes for high-areal-capacitance stretchable micro-supercapacitor-arrays

Wu, Yudong; Hu, Haibo; Yuan, Changzhou; Song, Jian; Wu, Mingzai

doi:10.1016/j.nanoen.2020.104812

Cited by 107 publications

(64 citation statements)

References 49 publications

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“…Nevertheless, similar to other 2D materials, aggregation and self‐restacking of flexible MXene flakes are usually inevitable during the electrode fabrication due to strong van der Waals interactions and hydrogen bonds between adjacent nanosheets. To address the problem, intercalated agents like CTAB, [ 13 ] TAEA, [ 14 ] Fe 2 O 3 , [ 15 ] Be 2+ , [ 16 ] and conducting polymers [ 17 , 18 , 19 , 20 ] have been introduced to expand the interlayer spacing of MXene flakes to counteract the effect of the self‐stacking propensity. The expanded interlayer spacing facilitates ion accessibility at the microscopic scale because MXene is a pseudocapacitive intercalation material in acidic electrolyte, in which oxygen‐containing functional groups undergo protonation with the intercalated H + , accompanied by a transformation in the titanium oxidation state.…”

Section: Introductionmentioning

confidence: 99%

A Multi‐Scale Structural Engineering Strategy for High‐Performance MXene Hydrogel Supercapacitor Electrode

et al. 2021

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MXenes as an emerging two-dimensional (2D) material have attracted tremendous interest in electrochemical energy-storage systems such as supercapacitors. Nevertheless, 2D MXene flakes intrinsically tend to lie flat on the substrate when self-assembling as electrodes, leading to the highly tortuous ion pathways orthogonal to the current collector and hindering ion accessibility. Herein, a facile strategy toward multi-scale structural engineering is proposed to fabricate high-performance MXene hydrogel supercapacitor electrodes. By unidirectional freezing of the MXene slurry followed by a designed thawing process in the sulfuric acid electrolyte, the hydrogel electrode is endowed with a three-dimensional (3D) open macrostructure impregnated with sufficient electrolyte and H + -intercalated microstructure, which provide abundant active sites for ion storage. Meanwhile, the ordered channels bring through-electrode ion and electron transportation pathways that facilitate electrolyte infiltration and mass exchange between electrolyte and electrode. Furthermore, this strategy can also be extended to the fabrication of a 3D-printed all-MXene micro-supercapacitor (MSC), delivering an ultrahigh areal capacitance of 2.0 F cm -2 at 1.2 mA cm -2 and retaining 1.2 F cm -2 at 60 mA cm -2 together with record-high energy density (0.1 mWh cm -2 at 0.38 mW cm -2 ).

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Section: Introductionmentioning

confidence: 99%

A Multi‐Scale Structural Engineering Strategy for High‐Performance MXene Hydrogel Supercapacitor Electrode

et al. 2021

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“…For instance, template and spacer strategies have been developed to improve water permeability. [13][14][15][16] Despite encouraging results in water permeation, the disordered interlayer space resulted from laissez-faire assembly of MXene flakes impedes the efficient separation of different molecules, due to the unstable mass transport. Moreover, for a water-related scenario, oxidative degradation of MXene nanosheets, which imperils their stability and practical significance, is another issue needed to be considered.…”

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confidence: 99%

A transport channel-regulated MXene membrane via organic phosphonic acids for efficient water permeation

Héraly

Chang

et al. 2021

Chem. Commun.

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“…Alternatively, one can design the patterns and microstructures of electrode materials with superstructure shapes by cutting the substrates and electrode material films directly with the help of laser and templates. Recently, flexible MSC arrays with Kirigami superstructures have been fabricated by laser cutting active material films and show excellent tensile properties, remaining stable even at the stretching of up to 200% elongation 31,143 . However, there are few reports on flexible MSCs with other superstructures, like origami, etc.…”

Section: Discussionmentioning

confidence: 99%

Recent developments of advanced micro-supercapacitors: design, fabrication and applications

et al. 2020

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The rapid development of wearable, highly integrated, and flexible electronics has stimulated great demand for on-chip and miniaturized energy storage devices. By virtue of their high power density and long cycle life, micro-supercapacitors (MSCs), especially those with interdigital structures, have attracted considerable attention. In recent years, tremendous theoretical and experimental explorations have been carried out on the structures and electrode materials of MSCs, aiming to obtain better mechanical and electrochemical properties. The high-performance MSCs can be used in many fields, such as energy storage and medical assistant examination. Here, this review focuses on the recent progress of advanced MSCs in fabrication strategies, structural design, electrode materials design and function, and integrated applications, where typical examples are highlighted and analyzed. Furthermore, the current challenges and future development directions of advanced MSCs are also discussed.

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Electrons/ions dual transport channels design: Concurrently tuning interlayer conductivity and space within re-stacked few-layered MXenes film electrodes for high-areal-capacitance stretchable micro-supercapacitor-arrays

Cited by 107 publications

References 49 publications

A Multi‐Scale Structural Engineering Strategy for High‐Performance MXene Hydrogel Supercapacitor Electrode

A Multi‐Scale Structural Engineering Strategy for High‐Performance MXene Hydrogel Supercapacitor Electrode

A transport channel-regulated MXene membrane via organic phosphonic acids for efficient water permeation

Recent developments of advanced micro-supercapacitors: design, fabrication and applications

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