Composite of hierarchical interpenetrating 3D hollow carbon skeleton from lotus pollen and hexagonal MnO<sub>2</sub> nanosheets for high-performance supercapacitors

Liu, Hongpeng; Wang, Bin; He, Xinyi; Xiao, Jun; Zhang, Hongseng; Liu, Qi; Liu, Jingyuan; Wang, Jun; Liu, Lianhe; Wang, Peng

doi:10.1039/c5ta01890k

Cited by 48 publications

(24 citation statements)

References 73 publications

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“…Electrochemical performances were evaluated by cyclic voltammetry (CV), galvanostatic charge− discharge (GCD) measurements, and electrical impedance spectroscopy (EIS) analysis. For the two-electrode system, the specific capacitances (C, F g −1 ), energy density (E, W h kg −1 ), and power density (P, W kg −1 ) were calculated by the following equations: C = 4IΔt/ΔVm, E = 0.5C(ΔV) 2 , and P = E/Δt, where I (A), Δt (s), ΔV (V), and m (g) are the GCD current, discharge time, voltage window, and mass of active material, respectively. In the three-electrode system, the specific gravimetric capacitance was determined according to the GCD measurements: C = IΔt/ΔVm.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…The rapid increase in the world population and economic expansion around the world have led to increasing use of energy-based appliances, which eventually results in high energy consumption . Owing to their high power density and superior cyclability relative to batteries, electrochemical capacitors (ECs) have emerged as an important electrical energy storage technology that will play a critical role in the large-scale deployment of intermittent renewable energy sources, smart power grids, and electrical vehicles. − Generally, carbon materials have been considered as promising electrode materials for ECs owing to their large specific surface area, rich porous structure, tunable pore sizes, and stable chemical properties. , However, the conventional powder carbon materials largely hinder their utilization owing to the dustability and tedious operation process when they are assembled as electrodes in ECs. The monolith carbon or carbon aerogels, such as porous carbon monolith, graphene aerogels, and carbon nanotube (CNT) aerogels, can solve these problems well.…”

Section: Introductionmentioning

confidence: 99%

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Raw-Cotton-Derived N-Doped Carbon Fiber Aerogel as an Efficient Electrode for Electrochemical Capacitors

Liu

et al. 2018

ACS Sustainable Chem. Eng.

113

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The carbon fiber aerogel with a high surface area, as a promising ideal electrode for electrochemical capacitors (ECs), has attracted tremendous attention because it can offer a fast charge− discharge rate and an exceptional rate capability. However, there is still a big challenge to acquire highly porous fiber aerogel with elastic properties and good flexibility. Herein, N-doped porous carbon fiber aerogel (N-CFA) has been successfully fabricated using raw cotton as a fibrous template to obtain shaped aerogels. ZIF-8, in situ fabricated on the surface of cotton, played the role of an active agent and nitrogen source to create a rich porous structure with a certain nitrogen content. Benefiting from the macromonolith morphology with good flexibility, favorable mechanical durability, nitrogen doping, anda high specific surface area, the N-CFA exhibits excellent electrochemical performance with a high capacity of 365 F g −1 at a current of 0.5 A g −1 and a remarkable rate capability of 65.8% from 0.5 to 100 A g −1 as a binder-free electrode in ECs. Additionally, N-CFA also displays a high capacitance retention of 93.6% after 10000 consecutive cycles at 5 A g −1 . The strategy may offer a low-cost and scalable method to produce high-performance N-doped carbon aerogels for electrodes from biomass.

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Section: ■ Experimental Sectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Raw-Cotton-Derived N-Doped Carbon Fiber Aerogel as an Efficient Electrode for Electrochemical Capacitors

Liu

et al. 2018

ACS Sustainable Chem. Eng.

113

View full text Add to dashboard Cite

show abstract

“…All the Nyquist plots show similar pattern, that is, a semicircle at high-frequency region and a straight line at the low-frequency region. The diameter of the arc represents the charge transfer resistance (interface resistance) and the line shows the Warburg behavior which is resulted from ion diffusion to the electrode surface [36]. Obviously, among the hybrid nanocomposites, PEDOT/GO has shorter Warburg line than PEDOT/NCC and PEDOT/MWCNT implying that PEDOT/GO has fast and efficient ion movement from the electrolyte to the material surface [37].…”

Section: Galvanostatic Charge-dischargementioning

confidence: 99%

Poly(3,4-ethylenedioxythiophene) Doped with Carbon Materials for High-Performance Supercapacitor: A Comparison Study

Abidin

Azman

Kulandaivalu

et al. 2017

Journal of Nanomaterials

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A comparative study of multiwalled carbon nanotube (MWCNT), graphene oxide (GO), and nanocrystalline cellulose (NCC) as a dopant in the preparation of poly(3,4-ethylenedioxythiophene)- (PEDOT-) based hybrid nanocomposites was presented here. The hybrid nanocomposites were prepared via the electrochemical method in aqueous solution. The FTIR and Raman spectra confirmed the successful incorporation of dopants (MWCNT, GO, and NCC) into PEDOT matrix in the process of formation of the hybrid nanocomposites. It was observed that the choice of the carbon material affected the morphologies and supercapacitive properties of the hybrid nanocomposites. Incorporation of GO with PEDOT produces a paper-like sheet nanocomposite in which the wrinkled surface results in larger surface area compared to the network-like and rod-like structures of PEDOT/MWCNT and PEDOT/NCC, respectively. Owing to larger surface area, PEDOT/GO exhibits the highest specific capacitance (120.13 F/g), low equivalent series resistance (34.44 Ω), and retaining 87.99% of the initial specific capacitance after 1000 cycles, signifying a long-term cycling stability. Furthermore, the high performance of PEDOT/GO is also demonstrated by its high specific energy and specific power.

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“…Above all, pollen grains are attracting significant attention owing to their nontoxicity, high surface area and large pore volumes. These unique microstructures have inspired researchers to develop a variety of applications such as supercapacitors, lithium ion batteries and gas sensors . Moreover, the carbon‐based polymer additives with the greatest potential are carbon nanotubes (CNTs) .…”

Section: Figurementioning

confidence: 99%

Preparation of Highly Monodisperse Electroactive Pollen Biocomposites

Seo

Wang

et al. 2016

ChemNanoMat

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Sunflower pollen (SFP) was used as an ovel biotemplate to fabricate nanoporous and spiked particles coated with carboxyl-functionalized multiwalled carbon nanotubes (COOH-MWCNTs). The MWCNT coating on SFPs was characterized by scanning electron microscopy,d ynamic imaging particle analysis and Raman spectroscopy. The electrical properties of MWCNT-coated SFPs offer great potential tod evelop highly functional materials for electronics and optical applications.With continued innovations in materials science, robust biocompatible composites have received much attention due to their tailorable and multifunctional physical and chemical properties that enable promising applications in supercapacitors, polyactuators, catalysis, electronic sensors, biosensors and bioimaging.[1] In particular,e lectroconductivec omposites combining carbon materials and biopolymers with ah ierarchical structureh ave been reported to have excellent electrical conductivity and mechanical properties compared with nonfunctionalized biopolymers.[2] For example, Yang and co-workers reported the synthesis of polyphenylene sulfide-nanotube compositesb yasimple mixing and compression method, yielding am aterial which exhibitede nhanced conductive properties. [3] Presently,anumber of methods, such as covalent functionalization and noncovalent modification, are availablet or ealize carbon-based polymer composites with excellent mechanical and conductive performances. [1b, 4] However,t he synthesis of electroconductiveb iocompatible composite materials by as imple method remainsatechnological challenge.Nature offers variouse xcellent biotemplates with precise widths and lengths and uniform geometries, such as diatoms, yeasts, butterfly wings and pollen grains.[5] Above all, pollen grains are attracting significant attention owing to their nontoxicity, high surface area andl arge pore volumes. These uniquem icrostructures have inspired researchers to develop av ariety of applications such as supercapacitors, [6] lithiumi on batteries [7] and gas sensors. [8] Moreover,the carbon-based polymer additivesw ith the greatest potentiala re carbon nanotubes (CNTs).[9] Key attributes of CNTsi nclude intrinsically large surfacea reas and intriguing electrical properties that are motivating the development of new industrial products.[10] CNTs have become one of the main additives in polymer-composite fabrication because they are easy to produce and inexpensive.[11]Herein, we describe au nique method for preparing electroactive sunflower pollen (SFP) grains based on high-efficiency surfacef unctionalization with carboxyl-functionalized multiwalled CNTs( COOH-MWCNTs ). We introduce sodium dodecyls ulfate (SDS) into the precipitation process in order to endow hydrophilic chains on the surfaceo ft he pollen grains that serve as surfactants to enhanceh ydrophilic properties. SFP is used as an ovel biotemplate material to fabricate nanoporous and spikede lectroactive microspheres. The fabrication process and control of each step are shown in Figure 1(a, b)....

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Composite of hierarchical interpenetrating 3D hollow carbon skeleton from lotus pollen and hexagonal MnO₂ nanosheets for high-performance supercapacitors

Cited by 48 publications

References 73 publications

Raw-Cotton-Derived N-Doped Carbon Fiber Aerogel as an Efficient Electrode for Electrochemical Capacitors

Raw-Cotton-Derived N-Doped Carbon Fiber Aerogel as an Efficient Electrode for Electrochemical Capacitors

Poly(3,4-ethylenedioxythiophene) Doped with Carbon Materials for High-Performance Supercapacitor: A Comparison Study

Preparation of Highly Monodisperse Electroactive Pollen Biocomposites

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Composite of hierarchical interpenetrating 3D hollow carbon skeleton from lotus pollen and hexagonal MnO2 nanosheets for high-performance supercapacitors

Cited by 48 publications

References 73 publications

Raw-Cotton-Derived N-Doped Carbon Fiber Aerogel as an Efficient Electrode for Electrochemical Capacitors

Raw-Cotton-Derived N-Doped Carbon Fiber Aerogel as an Efficient Electrode for Electrochemical Capacitors

Poly(3,4-ethylenedioxythiophene) Doped with Carbon Materials for High-Performance Supercapacitor: A Comparison Study

Preparation of Highly Monodisperse Electroactive Pollen Biocomposites

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Composite of hierarchical interpenetrating 3D hollow carbon skeleton from lotus pollen and hexagonal MnO₂ nanosheets for high-performance supercapacitors