High energy density and low self-discharge of a quasi-solid-state supercapacitor with carbon nanotubes incorporated redox-active ionic liquid-based gel polymer electrolyte

Fan, Leqing; Tu, Qiu-Mei; Geng, Cheng-Long; Huang, Jing‐Mei; Gu, Yun; Lin, Jianming; Huang, Yunfang; Wu, Jihuai

doi:10.1016/j.electacta.2019.135425

Cited by 132 publications

(51 citation statements)

References 53 publications

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“…The semicircle represents the charge transfer resistance R ct in the high frequency region, which is caused by the discontinuity of charge movement at the electrode/electrolyte interface; the smaller the radius, the lower the charge transfer resistance and the higher the capacitance. The linear part of the low frequency region corresponds to the Warburg impedance and represents the OH − ion diffusion impedance [41,45,46] . Compared to other electrodes, the flower‐like NiCo 2 S 4 @BGPC electrode has a smaller R ct in the high‐frequency region due to the fact that Ni and Co elements exhibit multivalent states and that the process of sulphidation intensifies the degree of crystal defects and increases the number of active sites, which in turn accelerates the charge‐transfer rate [47,48] .…”

Section: Resultsmentioning

confidence: 99%

A Simple Hydrothermal Synthesis of Flower‐like NiCo₂S₄@Biomass‐graded Porous Carbon with Structural Synergy and Excellent Capacitive Performance

et al. 2022

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Flower‐like NiCo2S4@biomass‐graded porous carbon (NiCo2S4@BGPC) material was successfully prepared using a simple hydrothermal method and the pseudocapacitive performance was investigated. The results showed that the composite had good capacitive behavior and electrochemical activity due to the structural synergy of the porous carbon and flower‐like material. In this composite, the flower‐like NiCo2S4 had a large contact area with the electrolyte solution, providing many active sites for pseudocapacitive reactions. Meanwhile, the introduction of the porous carbon skeleton further ensured the structural stability of the composite‘s conductive network. In summary, the flower‐like NiCo2S4@BGPC material showed the high specific capacitance of 1322.5 F g−1 at the current density of 1 A g−1 and excellent coulombic efficiency (96.8 % after 1000 cycles at 10 A g−1). However, it has poor cycling stability (77 % of the initial specific capacitance after 1000 cycles at 10 A g−1), which can be attributed to blockage of the pore structure due to volume expansion during the redox process. In two‐electrode system tests, both NiCo2S4@BGPC//NiCo2S4@BGPC symmetrical supercapacitor and NiCo2S4@BGPC//AC asymmetrical supercapacitor showed good capacitance performance and cycling performance, implying potential applications of NiCo2S4@BGPC in commercial electrochemical energy storage.

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Section: Resultsmentioning

confidence: 99%

A Simple Hydrothermal Synthesis of Flower‐like NiCo₂S₄@Biomass‐graded Porous Carbon with Structural Synergy and Excellent Capacitive Performance

et al. 2022

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“…Supercapacitors rely on electrode materials for charge storage, so electrode materials are the key part of the performance of supercapacitors ( Choi et al, 2020 ; WulanSeptiani et al, 2020 ; Fu et al, 2021 ; Xu et al, 2021b ; Liu et al, 2021a ; Liu et al, 2021b ; Du et al, 2022 ). Carbon materials, such as porous carbon ( Li et al, 2019a ), graphene ( Zhou et al, 2020 ), carbon nanotubes ( Fan et al, 2020 ), and ordered mesoporous carbon ( Wang et al, 2018 ), are considered the most suitable electrode materials for supercapacitors due to their high specific surface area, developed pore structure, high electronic conductivity, and excellent stability ( Chen et al, 2020a ; Shang et al, 2020 ; Xu et al, 2020c ). Unfortunately, strong van der Waals forces between graphene sheets tend to cause graphene sheets to accumulate and agglomerate ( Xiong et al, 2020 ).…”

Section: Introductionmentioning

confidence: 99%

Lignin-Based/Polypyrrole Carbon Nanofiber Electrode With Enhanced Electrochemical Properties by Electrospun Method

Kim

et al. 2022

Front. Chem.

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Tailoring the structure and properties of lignin is an important step toward electrochemical applications. In this study, lignin/polypyrrole (PPy) composite electrode films with microporous and mesoporous structures were designed effectively by electrostatic spinning, carbonization, and in situ polymerization methods. The lignin can not only reduce the cost of carbon fiber but also increase the specific surface area of composite films due to the removal of carbonyl and phenolic functional groups of lignin during carbonization. Besides, the compact three-dimensional (3D) conductive network structures were constructed with PPy particles densely coated on the lignin nanofibers, which was helpful to improve the conductivity and fast electron transfer during the charging and discharging processes. The synthesized lignin carbon fibers/PPy anode materials had good electrochemical performance in 1 M H2SO4 electrolyte. The results showed that, at a current density of 1 A g−1, the lignin carbon nanofibers/PPy (LCNFs/PPy) had a larger specific capacitance of 213.7 F g−1 than carbon nanofibers (CNFs), lignin carbon nanofibers (LCNFs), and lignin/PPy fiber (LPAN/PPy). In addition, the specific surface area of LCNFs/PPy reached 872.60 m2 g−1 and the average pore size decreased to 2.50 nm after being coated by PPy. Therefore, the independent non-binder and self-supporting conductive film is expected to be a promising electrode material for supercapacitors with high performance.

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“…Compared to the conventional cell configuration consisting of liquid electrolytes and separators (e.g., cellulose membrane, Celgard membrane), polymer matrices in GPEs play several roles: as an effective separator, a reservoir for electrolytes, and pathways for ion diffusion. Due to the integrated functions and merits, GPE has widely substituted liquid electrolytes in a variety of energy conversion and storage devices, including solar cells [3], lithium-ion batteries [4,5], supercapacitors [6,7], etc.…”

Section: Introductionmentioning

confidence: 99%

Coherent Integration of Organic Gel Polymer Electrolyte and Ambipolar Polyoxometalate Hybrid Nanocomposite Electrode in a Compact High-Performance Supercapacitor

2022

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We report a gel polymer electrolyte (GPE) supercapacitor concept with improved pathways for ion transport, thanks to a facile creation of a coherent continuous distribution of the electrolyte throughout the electrode. Poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) was chosen as the polymer framework for organic electrolytes. A permeating distribution of the GPE into the electrodes, acting both as integrated electrolyte and binder, as well as thin separator, promotes ion diffusion and increases the active electrode–electrolyte interface, which leads to improvements both in capacitance and rate capability. An activation process induced during the first charge–discharge cycles was detected, after which, the charge transfer resistance and Warburg impedance decrease. We found that a GPE thickness of 12 μm led to optimal capacitance and rate capability. A novel hybrid nanocomposite material, formed by the tetraethylammonium salt of the 1 nm-sized phosphomolybdate cluster and activated carbon (AC/TEAPMo12), was shown to improve its capacitive performance with this gel electrolyte arrangement. Due to the homogeneous dispersion of PMo12 clusters, its energy storage process is non-diffusion-controlled. In the symmetric capacitors, the hybrid nanocomposite material can perform redox reactions in both the positive and the negative electrodes in an ambipolar mode. The volumetric capacitance of a symmetric supercapacitor made with the hybrid electrodes increased by 40% compared to a cell with parent AC electrodes. Due to the synergy between permeating GPE and the hybrid electrodes, the GPE hybrid symmetric capacitor delivers three times more energy density at higher power densities and equivalent cycle stability compared with conventional AC symmetric capacitors.

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High energy density and low self-discharge of a quasi-solid-state supercapacitor with carbon nanotubes incorporated redox-active ionic liquid-based gel polymer electrolyte

Cited by 132 publications

References 53 publications

A Simple Hydrothermal Synthesis of Flower‐like NiCo₂S₄@Biomass‐graded Porous Carbon with Structural Synergy and Excellent Capacitive Performance

A Simple Hydrothermal Synthesis of Flower‐like NiCo₂S₄@Biomass‐graded Porous Carbon with Structural Synergy and Excellent Capacitive Performance

Lignin-Based/Polypyrrole Carbon Nanofiber Electrode With Enhanced Electrochemical Properties by Electrospun Method

Coherent Integration of Organic Gel Polymer Electrolyte and Ambipolar Polyoxometalate Hybrid Nanocomposite Electrode in a Compact High-Performance Supercapacitor

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High energy density and low self-discharge of a quasi-solid-state supercapacitor with carbon nanotubes incorporated redox-active ionic liquid-based gel polymer electrolyte

Cited by 132 publications

References 53 publications

A Simple Hydrothermal Synthesis of Flower‐like NiCo2S4@Biomass‐graded Porous Carbon with Structural Synergy and Excellent Capacitive Performance

A Simple Hydrothermal Synthesis of Flower‐like NiCo2S4@Biomass‐graded Porous Carbon with Structural Synergy and Excellent Capacitive Performance

Lignin-Based/Polypyrrole Carbon Nanofiber Electrode With Enhanced Electrochemical Properties by Electrospun Method

Coherent Integration of Organic Gel Polymer Electrolyte and Ambipolar Polyoxometalate Hybrid Nanocomposite Electrode in a Compact High-Performance Supercapacitor

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A Simple Hydrothermal Synthesis of Flower‐like NiCo₂S₄@Biomass‐graded Porous Carbon with Structural Synergy and Excellent Capacitive Performance

A Simple Hydrothermal Synthesis of Flower‐like NiCo₂S₄@Biomass‐graded Porous Carbon with Structural Synergy and Excellent Capacitive Performance