Highly Performed Fiber‐Based Supercapacitor in a Conjugation of Mesoporous MXene

Guo, Zijiao; Lü, Zan; Li, Yue; Liu, Wei

doi:10.1002/admi.202101977

Cited by 14 publications

(6 citation statements)

References 41 publications

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“…Therefore, all MF samples exhibit similar rate performances with >80% capacitance well retained as the current density increases from 1 to 10 A cm −3 (Figure 5d). Taking both specific capacitance and rate capability into consideration, a comparison was made in Figure 5e and the performance of our N-doped MFs surpass other MXenebased fibers reported previously, such as MXene/PEDOT:PSS, [25] MXene/rGO, [10] MXene, [26] Ac-MXene, [27] ANF/MXene, [12] P-MXene, [28] ZIF-MXene, [29] and O-Flat MXene, [30] etc. According to the equation of i = av b , the rapid capacitance behavior dominates the charge/discharge process when b approaches 1.…”

Section: Resultsmentioning

confidence: 69%

Rheology Engineering for Dry‐Spinning Robust N‐Doped MXene Sediment Fibers toward Efficient Charge Storage

Xia,

Dai,

Chang

et al. 2023

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MXene nanosheets are believed to be an ideal candidate for fabricating fiber supercapacitors (FSCs) due to their metallic conductivity and superior volumetric capacitance, while challenges remain in continuously collecting bare MXene fibers (MFs) via the commonly used wet‐spinning technique due to the intercalation of water molecules and a weak interaction between Ti3C2TX nanosheets in aqueous coagulation bath that ultimately leads to a loosely packed structure. To address this issue, for the first time, a dry‐spinning strategy is proposed by engineering the rheological behavior of Ti3C2TX sediment and extruding the highly viscose stock directly through a spinneret followed by a solvent evaperation induced solidification. The dry‐spun Ti3C2TX fibers show an optimal conductivity of 2295 S cm−1, a tensile strength of 64 MPa and a specific capacitance of 948 F cm−3. Nitrogen (N) doping further improves the capacitance of MFs to 1302 F cm−3 without compromising their mechanical and electrical properties. Moreover, the FSC based on N‐doped MFs exhibits a high volumetric capacitance of 293 F cm−3, good stability over 10 000 cycles, excellent flexibility upon bending‐unbending, superior energy/power densities and anti‐self‐discharging property. The excellent electrochemical and mechanical properties endow the dry‐spun MFs great potential for future applications in wearable electronics.

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Section: Resultsmentioning

confidence: 69%

Rheology Engineering for Dry‐Spinning Robust N‐Doped MXene Sediment Fibers toward Efficient Charge Storage

Xia,

Dai,

Chang

et al. 2023

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“…Meanwhile, the abundant Ti 3 C 2 T x nanosheets overlapping on the wood cell wall form a continuously interconnected and conductive network, guaranteeing fast electron delivery for sufficient reaction even at high current density. The Nyquist plots of TDVW-9 (Figure f) are obtained and show an equivalent serial resistance ( R s ) value of 0.45 Ω which is much lower than those of reported wood or MXene-based hybrid SCs (e.g., wood/ppy: 5.2 Ω, wood/rGO: 7 Ω, and Ti 3 C 2 T x fibers: 10 Ω). Furthermore, the SC delivers a high energy density of 13.85 μW h cm –2 (14.51 Wh kg –1 , 7.39 mWh cm –3 ) at a power density of 87.5 μW cm –2 (98 W kg –1 , 1.4 mW cm –3 ) which is much higher than those of reported studies (Figure g) (e.g., carbonized wood: 9.04 Wh kg –1 at 38.47 W kg –1 , MoS 2 : 16.36 mWh cm –3 at 7.5 W cm –3 , and so on − , S15 ).…”

Section: Resultsmentioning

confidence: 80%

A Flexible Vertical-Section Wood/MXene Electrode with Excellent Performance Fabricated by Building a Highly Accessible Bonding Interface

Luo

Zhang

Yang

et al. 2022

ACS Appl. Mater. Interfaces

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Cross-section wood (CW) is generally used as a host for free-standing electrodes, as the abundant opened pores can provide large space for loading guest materials with high electrical conductivity and electrochemical activity. However, there is still a challenge for CW to be used in flexible supercapacitors (SCs) because of its low mechanical strength. Herein, as an alternative to CW, vertical-section wood (VW) with excellent mechanical strength and good flexibility is developed and used as a free-standing and flexible electrode by using Ti3C2T x (MXene) with ultrahigh conductivity and good electrochemical activity as a guest material. In particular, the highly accessible bonding interface for Ti3C2T x is first built by delignification on VW to generate abundant pores for continuously absorbing Ti3C2T x and to expose cellulose with abundant oxygen-containing groups for stable combination with Ti3C2T x . Then, cyclic pressing is used to form negative pressure to pump the Ti3C2T x suspension into VW, combining with a preheating process to trigger layer-by-layer self-assembly of Ti3C2T x nanosheets onto a wood cell wall by evaporating water in the suspension. As a result, the free-standing electrode has a large Ti3C2T x loading mass proportion of 33 wt %, a high conductivity of 3.14 S cm–1, and good flexibility with much higher mechanical strength of 15.1 MPa than 0.4 MPa of CW. The symmetric SC delivers a good specific capacitance of 805 mF cm–2 at 0.5 mA cm–2, a remarkably high rate capability of 84% to 10 mA cm–2, and an energy density of 13.85 μW h cm–2 at 87.5 μW cm–2. Additionally, this SC shows a long lifespan of 90.5% after 10,000th charge and discharge cycles even at a constant bending angle of 90°, suggesting promising potential in flexible devices.

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“…Compared with the MXene electrode, the ion storage mechanism of the MXene/ANFs composite film is further governed by the capacitive-controlled process. Thus, the enlarged interlayer spacing and introduced functional groups in the MXene/ANFs composite film provide broader pathway for ion transfer and more sites for ion storage, leading to increased ionic conductivity in the electrolyte and higher intercalative pseudocapacitance contribution as well as the total capacitance [45,47]. Furthermore, the CV curves of MXene/ANF-T composite film under various scan rate were performed (figure 4(d)).…”

Section: Ion Kinetics Of the Filmsmentioning

confidence: 99%

Tailoring the ion storage of MXene by aramid nanofibers towards self-standing electrodes for flexible solid-state supercapacitors

Sun,

Li,

Ren

2024

Nanotechnology

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Two-dimensional (2D) transition metal carbides and nitrides (MXenes) are a class of 2D nanomaterials that can offer excellent properties for high-performance supercapacitors. Nevertheless, irreversible restacking of MXene sheets decreases the interlayer spacing, which inhibits the ion intercalation between the MXene nanosheets and finally deteriorates the electrochemical performance of supercapacitors. Herein, aramid nanofibers (ANFs) are mixed with Ti3C2T x MXene to prepare MXene/ANFs composite films. The restacking of MXene sheets is inhibited by the electrostatic repulsion between ANFs and MXene. The ANFs act as intercalation agents to increase the interlayer spacing of the composite films, which can improve the ion storage ability of supercapacitors. Furthermore, the ANFs enhance the mechanical strength of the composite films due to the strong hydrogen bonding interaction and nanomechanical interlocking between ANFs and MXene, endowing the composite films with self-standing property. The resultant composite films are used as electrodes for flexible solid-state supercapacitors to achieve high specific capacitance (996.5 mF cm−2 at 5 mV s−1) and outstanding cycling stability. Thus, this work provides a potential strategy to regulate the properties of 2D nanomaterials, which may expand the application of them in energy storage, ionic separation, osmotic energy conversion and beyond.

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Highly Performed Fiber‐Based Supercapacitor in a Conjugation of Mesoporous MXene

Cited by 14 publications

References 41 publications

Rheology Engineering for Dry‐Spinning Robust N‐Doped MXene Sediment Fibers toward Efficient Charge Storage

Rheology Engineering for Dry‐Spinning Robust N‐Doped MXene Sediment Fibers toward Efficient Charge Storage

A Flexible Vertical-Section Wood/MXene Electrode with Excellent Performance Fabricated by Building a Highly Accessible Bonding Interface

Tailoring the ion storage of MXene by aramid nanofibers towards self-standing electrodes for flexible solid-state supercapacitors

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