High-Performance Symmetric Supercapacitor Constructed Using Carbon Cloth Boosted by Engineering Oxygen-Containing Functional Groups

Miao, Zhenyu; Huang, Yuan; Xin, Jianping; Su, Xiaowen; Sang, Yuanhua; Liu, Hong; Wang, Jianjun

doi:10.1021/acsami.9b04426

Cited by 122 publications

(65 citation statements)

References 45 publications

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“…The proposed device exhibited an energy density of 22.11 mWh cm −3 (14.66 mWh cm −3 ) at the power density of 2.99 W cm −3 (23.25 W cm −3 ). Our device exhibited far better performance than other symmetric supercapacitors (SSC), such as PPy‐MXene‐SSC, [ 39 ] AECC‐SSC, [ 40 ] OPFC‐SSC, [ 41 ] and pristine MXene fabricated SSC. Additionally, the decrease in the energy density was gradual, indicating that the grown MWCNTs effectively improved the electrochemical performance of the composite electrode.…”

Section: Resultsmentioning

confidence: 91%

In Situ Grown MWCNTs/MXenes Nanocomposites on Carbon Cloth for High‐Performance Flexible Supercapacitors

Chen

Ali

et al. 2020

Adv Funct Materials

104

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Owing to their large surface-area-to-volume ratios, 2D titanium carbides and nitrides (MXenes) have emerged as promising materials for energy storage devices. However, poor interlayer and interparticle conductivity of MXenes (due to its anisotropic nature) is a bottleneck for widening their applications. Additionally, the stacked structure of MXene sheets limits the exposed surface area and renders a complex electrolyte diffusion. To address these issues, a unique composite comprising of homogeneously grown multiwall carbon nanotubes (MWCNTs) on carbon cloth (CC)-supported MXene sheets (denoted as MWCNTs-MXene@CC) is proposed. The MWCNTs-MXene@CC reveal the synergistic combination of exfoliated large surface area and excellent conductivity. Consequently, the fabricated electrode exhibits a specific capacitance of 114.58 mF cm −2 at a discharge current of 1 mA cm −2 , while maintaining high retention after 1.6 × 10 4 cycles at 10 mA cm −2. Such high performance of the composite structure is attributed to the superb interlayer and interparticle conductivity imparted by the grown MWCNTs. Furthermore, the grown MWCNTs also serve as the interlayer pillar in MXene sheets, thus preventing the spontaneous collapse of the latter. The approach can be extended to other electrocatalyst systems in which ion transport and electrolyte diffusion need to be addressed simultaneously.

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Section: Resultsmentioning

confidence: 91%

In Situ Grown MWCNTs/MXenes Nanocomposites on Carbon Cloth for High‐Performance Flexible Supercapacitors

Chen

Ali

et al. 2020

Adv Funct Materials

104

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Section: Introductionmentioning

confidence: 99%

“…Recently, there has been a fast development using novel emerging activation agents such as copper chloride (CuCl 2 ) and potassium permanganate (KMnO 4 ) for the preparation of porous carbons. [16,17] These novel activation agents produce porous carbons with high SSA and unique morphologies but may generate toxic gases that need further decontamination. As the synthesis of chemically activated porous carbons using these novel activation agents is not environmentally friendly, the search for environmentally benign chemical activation agents and green chemical activation processes is critical for the sustainable development of porous carbons.…”

Section: Introductionmentioning

confidence: 99%

Synthesis Strategies of Porous Carbon for Supercapacitor Applications

et al. 2020

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Supercapacitors (SCs) have experienced a significant increase in research activity and commercialization during the past few decades. As the primary and most important electrode active material for commercial SCs, porous carbon is produced at an industrial‐scale through traditional carbonization‐activation strategies. Nevertheless, commercial porous carbon materials have some disadvantages such as high production cost, corrosion of equipment, and emission of toxic gases and byproduct pollutants during production. In recent years, huge efforts have been made to develop novel synthesis strategies for porous carbon materials. This review focuses on the pore formation mechanisms in traditional carbonization‐activation methods, emerging activation methods, template methods, self‐template methods, and novel emerging methods for the synthesis of porous carbons for SCs. Strategies developed so far for the synthesis of porous carbon materials are summarized. The mechanisms and recent advances for each strategy are reviewed. Furthermore, future directions and synthesis strategies for porous carbons are proposed.

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“…This can be attributed to the different setups between these two systems, such as the current collector, the mass loading, and the reference electrode. [ 38,39 ] The specific capacitance of CNT/PMo/PANI was calculated from the discharge GCD curves and shown in Figure 6b. At current density of 5 A g −1 , the specific capacitance value is 210 F g −1 .…”

Section: Resultsmentioning

confidence: 99%

Coaxial Cable‐Like Carbon Nanotubes‐Based Active Fibers for Highly Capacitive and Stable Supercapacitor

Yang

Xie

Wang

et al. 2020

Adv Materials Inter

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POMs) and carbon nanomaterials become a new option for achieving higher capacitance. [4] POMs are anionic metal-oxo clusters of [M x O y ] n− consisting of two or more metals (M, e.g., Mo, W, V) with high oxidation states which are linked by oxoligands. [5] Therefore POMs are the good candidates for supercapacitor due to their fast and reversible multi-electron redox reactions along with the high theoretical values. [6-8] However, POMs exhibit strong solubility in water and many organic solvents due to their anionic nature, which limits their broad application on supercapacitors. [9] Thus, tremendous efforts have been devoted to immobilizing POMs onto carbon materials. Anchoring POMs with carbon is extremely critical since it can not only prevent the dissolution of POMs but also enhance the conductivity. [10-14] There are three most straightforward and effective methods for the synthesis of POMcarbon composites: i) chemisorption, ii) self-assembly, and iii) immobilization in a polymer matrix. [8,15] For chemisorption, POMs molecules are usually adsorbed at defect sites (e.g., the surface functional groups, the crystal defects) by strong and irreversible bonding. Therefore the amount of chemisorbed POMs is dependent on the functionalization degree on carbon materials. [7] For self-assembly, since the POMs are electronegative in solution, the cationic polymer molecular should be used to modify the surface of carbon, such as polyethyleneimine (PEI), and poly(diallyldimethylammonium chloride) (PDDA). [16,17] For immobilization in a polymer matrix, it can be divided into two methods, including the two-step method and the one-step method. The former is POMs diffuse and incorporate into the previously deposited polymer matrix. The latter is the polymer film is formed in the presence of a POM solution. POMs with oxidative property can chemically polymerize monomer molecules to form a polymer film. [18] Meanwhile, the conductive polymer with intrinsic redox activity can contribute more pseudocapacitance. This inspires us to fabricate coaxial cable-like active fibers by using carbon nanotubes (CNTs) as conductive substrates, POMs as main active materials, and conductive polymer as a shield and active material. It is expected that the stability and specific capacitance could be significantly improved simultaneously. The pioneering study of Cs-PMo/chitosan/CNTs hybrid materials showed enhanced capacitance and good stability during 500 cycles. [19] Lian and co-workers demonstrated that the CNTs coated with the Polyoxometalate (POM) as one pseudocapacitive material could efficiently boost the capacitance of carbon materials. However, POM hydrolysis is a key obstacle in utilizing POM for supercapacitors, causing reduced cycling stability. Here, coaxial cable-like carbon nanotubes(CNTs)-based active fibers are synthesized for highly capacitive and stable supercapacitors. The POM layer of PMo 12 O 40 3− (PMo) is physically protected from the hydrolysis by the external polyaniline (PANI) layer. The optimal CNT/PMo/PANI fibers show...

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High-Performance Symmetric Supercapacitor Constructed Using Carbon Cloth Boosted by Engineering Oxygen-Containing Functional Groups

Cited by 122 publications

References 45 publications

In Situ Grown MWCNTs/MXenes Nanocomposites on Carbon Cloth for High‐Performance Flexible Supercapacitors

In Situ Grown MWCNTs/MXenes Nanocomposites on Carbon Cloth for High‐Performance Flexible Supercapacitors

Synthesis Strategies of Porous Carbon for Supercapacitor Applications

Coaxial Cable‐Like Carbon Nanotubes‐Based Active Fibers for Highly Capacitive and Stable Supercapacitor

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