Tailoring the structure of supported δ-MnO2 nanosheets to raise pseudocapacitance by surface-modified carbon cloth

Liu, Shaobo; Liu, Kang; Chen, Kejun; Fu, Junwei; Li, Huangjingwei; An, Pengda; Li, Hongmei; Jia, Chuankun; Xie, Haipeng; Liu, Hui; Hu, Junhua; Pan, Hao; Zheng, Xusheng; Liu, Xiaoliang; Wang, Xiaoming; Liu, Min

doi:10.1016/j.jpowsour.2019.227507

Cited by 22 publications

(8 citation statements)

References 49 publications

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“…k 1 and k 2 values can be calculated from the slope and intercept of the linear i/v 1/2 to v 1/2 plots, respectively. 60 As shown in Figures 4f and S5, the surface capacitance contribution of Ti 3 C 2 T x /MoO 3−x -50% to the total capacitance increases from 10.9% at 2 mV s −1 to 42.2% at 100 mV s −1 in 1 M H 2 SO 4 . Therefore, it can be confirmed that with the increase in scanning rates, the surface capacitive effect becomes stronger, but the diffusion effect is the dominant behavior in Ti 3 C 2 T x /MoO 3−x -50%, in agreement with the b-values obtained from the previous calculations.…”

Section: Resultsmentioning

confidence: 78%

“…In order to further quantify the surface capacitance and diffusion contribution of the total capacitance, the following eqs and are used. in which k 1 v and k 2 v 1/2 denote the currents from the surface capacitance contribution and diffusive contribution, separately. k 1 and k 2 values can be calculated from the slope and intercept of the linear i / v 1/2 to v 1/2 plots, respectively …”

Section: Resultsmentioning

confidence: 99%

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Self-Standing Ti₃C₂T_x/MoO_3–x Composite Films with High Volumetric and Gravimetric Capacitance Performances for Flexible Solid-State Supercapacitors

Sui

et al. 2022

Energy Fuels

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Two-dimensional MXene materials have received a great deal of attention for their use in energy storage. However, MXene usually suffers from severe self-restacking, which leads to the active sites being covered, hinders the electrolyte ion transport, and thus affects the electrochemical performance. In the present work, molybdenum trioxide with oxygen vacancy (MoO3–x ) nanobelts as the interspacer and active electrode material were introduced into Ti3C2T x , a member of MXenes family, by the vacuum-assisted filtration method to form the self-standing film. Conductive Ti3C2T x nanosheets bridge MoO3–x nanobelts to facilitate electron transfer, and MoO3–x nanobelts are randomly intercalated between Ti3C2T x nanosheets to effectively prevent self-restacking of Ti3C2T x , provide pseudocapacitance, and promote wettability. The Ti3C2T x /MoO3–x -50% displays high volumetric/gravimetric capacitance performances (1893.2 F cm–3 and 733.8 F g–1 at 1 A g–1 and at 20 A g–1 with 1578.7 F cm–3 and 611.9 F g–1), outperforming reported Ti3C2T x , Ti3C2T x -based, or MoO3-based composites. Furthermore, Ti3C2T x /MoO3–x -50% presents capacitance retention of 90.2% after 2000 cycles, showing good cycling stability. The assembled Ti3C2T x /MoO3–x -50%//Ti3C2T x /MoO3–x -50% flexible solid-state supercapacitor using a PVA/H2SO4 gel electrolyte displays high volumetric/gravimetric energy densities (25.8 W h L–1 at 448.7 W L–1 and 10.0 W h kg–1 at 173.9 W kg–1) and good cycling stability. In addition, the supercapacitor shows little significant capacitance loss after 100th bending cycle of 180°, demonstrating excellent flexibility. Such a self-standing Ti3C2T x /MoO3–x composite film and its flexible solid-state symmetric supercapacitor show great potential in wearable and portable electronic devices.

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Section: Resultsmentioning

confidence: 78%

Section: Resultsmentioning

confidence: 99%

Self-Standing Ti₃C₂T_x/MoO_3–x Composite Films with High Volumetric and Gravimetric Capacitance Performances for Flexible Solid-State Supercapacitors

Sui

et al. 2022

Energy Fuels

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“…Meanwhile, the low-frequency curve of the EIS shown in the inset of Fig. 6d is nearly vertical, which indicates that the electrolyte ions have excellent shuttling ability between positive and negative electrodes [49]. The cycling stability of the device is also evaluated by repeated charge and discharge test at 10 A g −1 .…”

Section: Figure 5b Presents the Cyclic Voltammetry Curves Ofmentioning

confidence: 93%

Nickel–Cobalt Hydroxides with Tunable Thin-Layer Nanosheets for High-Performance Supercapacitor Electrode

et al. 2021

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Layered double hydroxides as typical supercapacitor electrode materials can exhibit superior energy storage performance if their structures are well regulated. In this work, a simple one-step hydrothermal method is used to prepare diverse nickel–cobalt layered double hydroxides (NiCo-LDHs), in which the different contents of urea are used to regulate the different nanostructures of NiCo-LDHs. The results show that the decrease in urea content can effectively improve the dispersibility, adjust the thickness and optimize the internal pore structures of NiCo-LDHs, thereby enhancing their capacitance performance. When the content of urea is reduced from 0.03 to 0.0075 g under a fixed precursor materials mass ratio of nickel (0.06 g) to cobalt (0.02 g) of 3:1, the prepared sample NiCo-LDH-1 exhibits the thickness of 1.62 nm, and the clear thin-layer nanosheet structures and a large number of surface pores are formed, which is beneficial to the transmission of ions into the electrode material. After being prepared as a supercapacitor electrode, the NiCo-LDH-1 displays an ultra-high specific capacitance of 3982.5 F g−1 under the current density of 1 A g−1 and high capacitance retention above 93.6% after 1000 cycles of charging and discharging at a high current density of 10 A g−1. The excellent electrochemical performance of NiCo-LDH-1 is proved by assembling two-electrode asymmetric supercapacitor with carbon spheres, displaying the specific capacitance of 95 F g−1 at 1 A g−1 with the capacitance retention of 78% over 1000 cycles. The current work offers a facile way to control the nanostructure of NiCo-LDHs, confirms the important affection of urea on enhancing capacitive performance for supercapacitor electrode and provides the high possibility for the development of high-performance supercapacitors.

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“…The techniques like chemical vapor deposition or in situ deposition of active materials on substrates during synthesis can be utilized to prepare binder free electrodes where active materials are predominantly deposited in nanostructure form. Some demonstrations have already been reported 25‐29 …”

Section: Introductionmentioning

confidence: 92%

“…Some demonstrations have already been reported. [25][26][27][28][29] Based on the above discussed approach, in this work, we assembled a flexible supercapacitor using hydrothermally synthesized nanorods of MnO 2 which are in situ grown on CC substrate. The main objective of this work is to investigate performance analysis of the developed supercapacitor under different operating conditions.…”

Section: Introductionmentioning

confidence: 99%

Carbon cloth‐MnO₂ nanotube composite for flexible supercapacitor

et al. 2020

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Three-dimensional MnO 2 nanorods were synthesized on a carbon cloth (CC) via hydrothermal method to fabricate binder-free electrode for flexible supercapacitor application. The fabricated MnO 2 /CC electrode exhibits specific capacitance of 487 F g −1 at current density of 2 A g −1 in conventional three electrode system using 1 M Na 2 SO 4 electrolyte. Furthermore, a flexible symmetric supercapacitor is assembled using 1 M Na 2 SO 4 electrolyte which shows maximum specific capacitance of 232 F g −1 at current density of 0.5 A g −1. The supercapacitor exhibits specific energy up to 5.18 Wh kg −1 and specific power of 242 W kg −1 at 0.5 and 1.0 A g −1 , respectively. Furthermore, the supercapacitor exhibits specific capacitance retention of 91.7% over 1000 charging discharging cycles. The attractive performance suggests that MnO 2 /CC supercapacitor has potential application for energy storage.

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Tailoring the structure of supported δ-MnO2 nanosheets to raise pseudocapacitance by surface-modified carbon cloth

Cited by 22 publications

References 49 publications

Self-Standing Ti₃C₂T_x/MoO_3–x Composite Films with High Volumetric and Gravimetric Capacitance Performances for Flexible Solid-State Supercapacitors

Self-Standing Ti₃C₂T_x/MoO_3–x Composite Films with High Volumetric and Gravimetric Capacitance Performances for Flexible Solid-State Supercapacitors

Nickel–Cobalt Hydroxides with Tunable Thin-Layer Nanosheets for High-Performance Supercapacitor Electrode

Carbon cloth‐MnO₂ nanotube composite for flexible supercapacitor

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Tailoring the structure of supported δ-MnO2 nanosheets to raise pseudocapacitance by surface-modified carbon cloth

Cited by 22 publications

References 49 publications

Self-Standing Ti3C2Tx/MoO3–x Composite Films with High Volumetric and Gravimetric Capacitance Performances for Flexible Solid-State Supercapacitors

Self-Standing Ti3C2Tx/MoO3–x Composite Films with High Volumetric and Gravimetric Capacitance Performances for Flexible Solid-State Supercapacitors

Nickel–Cobalt Hydroxides with Tunable Thin-Layer Nanosheets for High-Performance Supercapacitor Electrode

Carbon cloth‐MnO2 nanotube composite for flexible supercapacitor

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Product

Resources

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Self-Standing Ti₃C₂T_x/MoO_3–x Composite Films with High Volumetric and Gravimetric Capacitance Performances for Flexible Solid-State Supercapacitors

Self-Standing Ti₃C₂T_x/MoO_3–x Composite Films with High Volumetric and Gravimetric Capacitance Performances for Flexible Solid-State Supercapacitors

Carbon cloth‐MnO₂ nanotube composite for flexible supercapacitor