A facile “thick to thin” strategy for integrating high volumetric energy density and excellent flexibility into MXene/wood free-standing electrode for supercapacitors

Zhang, Daotong; Yang, Kai; Zhang, Tao; Luo, Min; Li, Min; Zhao, Li; Liu, Chaozheng; Ling, Yiying; Chen, Weimin; Zhou, Xiaoyan

doi:10.1016/j.cej.2023.141733

Cited by 18 publications

(7 citation statements)

References 62 publications

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“…S18b †), suggesting its favorable rate capability. Importantly, the areal capacitance of the FSC surpassed those of previously reported MXene-based exible devices (Table S2 †), such as MXene/rGO (372.2 mF cm −2 @10 mV s −1 ), 60 Ti 3 C 2 T x / MWCNT/PC (212 mF cm −2 @0.1 mA cm −2 ), 42 heat treated Ti 3 -C 2 T x @wood (302 mF cm −2 @0.5 mA cm −2 ), 61 and porous Ti 3 C 2 T x /CNT lm (118 mF cm −2 @5 mV s −1 ). 41 In addition, aer 5000 charge/discharge cycles at 20 mA cm −2 , the FSC possessed a high capacitance retention of 88.6% (Fig.…”

Section: Electrochemical Performance Of the Fsc Devicementioning

confidence: 58%

3D printed MXene-based films and cellulose nanofiber reinforced hydrogel electrolyte to enable high-performance flexible supercapacitors

Zhou,

Liu,

Liu

et al. 2024

J. Mater. Chem. A

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Section: Electrochemical Performance Of the Fsc Devicementioning

confidence: 58%

3D printed MXene-based films and cellulose nanofiber reinforced hydrogel electrolyte to enable high-performance flexible supercapacitors

Zhou,

Liu,

Liu

et al. 2024

J. Mater. Chem. A

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“…The peaks at 1628 and 522–565 cm –1 correspond to the CO and Ti–O bonds, indicating that the MXene is unaffected by the 400 °C annealing step. The peak at 3428 cm –1 corresponds to the stretching vibration of the −OH group in MXene. , Cellulose has known FTIR peaks at 3428 and 1628 cm –1 , corresponding to O–H stretching and bending modes . Also, increasing BC concentrations in the A-M/BC samples appear to cause a slight leftward shift in the Ti–O peak.…”

Section: Resultsmentioning

confidence: 97%

“…The peak at 3428 cm −1 corresponds to the stretching vibration of the −OH group in MXene. 36,37 Cellulose has known FTIR peaks at 3428 and 1628 cm −1 , corresponding to O−H stretching and bending modes. 38 Auger peak, which implies that the surface of the A-M/BC-0.2 film contains a Na moiety.…”

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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“…The Nyquist curves consist of high-frequency half-arcs and low-frequency oblique lines. The TOCNF/Ti 3 C 2 T x @AgNW electrodes show an almost vertical rise at low frequencies, indicating that their capacitive performance is close to ideal, [73] and electrolyte ions can easily access charge storage sites on the surface. [46] The intersection of the half arc and horizontal axis in the high-frequency region represents the equivalent series resistance (ESR) of the electrodes.…”

Section: Electrochemical Performance Of the Tocnf/ti 3 C 2 T X @Agnw ...mentioning

confidence: 93%

Facile Design of Flexible, Strong, and Highly Conductive MXene‐Based Composite Films for Multifunctional Applications

Wang,

Zhang,

Lai

et al. 2023

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Strong, conductive, and flexible materials with improving ion accessibility have attracted significant attention in electromagnetic interference (EMI) and foldable wearable electronics. However, it still remains a great challenge to realize high performance at the same time for both properties. Herein, a microscale structural design combined with nanostructures strategy to fabricate TOCNF(F)/Ti3C2Tx(M)@AgNW(A) composite films via a facile vacuum filtration process followed by hot pressing (TOCNF = TEMPO‐oxidized cellulose nanofibrils, NW = nanowires) is described. The comparison reveals that different microscale structures can significantly influence the properties of thin films, especially their electrochemical properties. Impressively, the ultrathin MA/F/MA film with enhanced layer in the middle exhibits an excellent tensile strength of 107.9 MPa, an outstanding electrical conductivity of 8.4 × 106 S m−1, and a high SSE/t of 26 014.52 dB cm2 g−1. The assembled asymmetric MA/F/MA//TOCNF@CNT (carbon nanotubes) supercapacitor leads to a significantly high areal energy density of 49.08 µWh cm−2 at a power density of 777.26 µW cm−2. This study proposes an effective strategy to circumvent the trade‐off between EMI performance and electrochemical properties, providing an inspiration for the fabrication of multifunctional films for a wide variety of applications in aerospace, national defense, precision instruments, and next‐generation electronics.

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A facile “thick to thin” strategy for integrating high volumetric energy density and excellent flexibility into MXene/wood free-standing electrode for supercapacitors

Cited by 18 publications

References 62 publications

3D printed MXene-based films and cellulose nanofiber reinforced hydrogel electrolyte to enable high-performance flexible supercapacitors

3D printed MXene-based films and cellulose nanofiber reinforced hydrogel electrolyte to enable high-performance flexible supercapacitors

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

Facile Design of Flexible, Strong, and Highly Conductive MXene‐Based Composite Films for Multifunctional Applications

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