Robust, hydrophilic graphene/cellulose nanocrystal fiber-based electrode with high capacitive performance and conductivity

Chen, Guoyin; Chen, Tao; Hou, Kai; Ma, Wujun; Tebyetekerwa, Mike; Cheng, Yanhua; Weng, Wei; Zhu, Meifang

doi:10.1016/j.carbon.2017.11.012

Cited by 150 publications

(93 citation statements)

References 42 publications

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“…The main reason is that the addition of NaOH makes graphene oxide bear more negative charges and repel each other, and the hydrogen bond network of the original liquid crystal phase is disrupted. Thus, the graphene oxide sheet are easily oriented and aligned in the shear flow during the extrusion process of fiber preparation …”

Section: Preparation Of 2d Crystal–based Fibersmentioning

confidence: 99%

2D Crystal–Based Fibers: Status and Challenges

Meng

Kong

et al. 2019

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2D crystals are emerging new materials in multidisciplinary fields including condensed state physics, electronics, energy, environmental engineering, and biomedicine. To employ 2D crystals for practical applications, these nanoscale crystals need to be processed into macroscale materials, such as suspensions, fibers, films, and 3D macrostructures. Among these macromaterials, fibers are flexible, knittable, and easy to use, which can fully reflect the advantages of the structure and properties of 2D crystals. Therefore, the fabrication and application of 2D crystal–based fibers is of great importance for expanding the impact of 2D crystals. In this Review, 2D crystals that are successfully prepared are overviewed based on their composition of elements. Subsequently, methods for preparing 2D crystals, 2D crystals dispersions, and 2D crystal–based fibers are systematically introduced. Then, the applications of 2D crystal–based fibers, such as flexible electronic devices, high‐efficiency catalysis, and adsorption, are also discussed. Finally, the status‐of‐quo, perspectives, and future challenges of 2D crystal–based fibers are summarized. This Review provides directions and guidelines for developing new 2D crystal–based fibers and exploring their potentials in the fields of smart wearable devices.

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Section: Preparation Of 2d Crystal–based Fibersmentioning

confidence: 99%

2D Crystal–Based Fibers: Status and Challenges

Meng

Kong

et al. 2019

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“…This result could be due to the interference of the CO contraction vibration of GO assembled on the CNFs . Additionally, two peaks at 1720 and 1385 cm −1 appeared in the spectral curve of the CNFs/GO (18) composite film and were ascribed to the CO and C─OH stretching vibrations of GO, respectively . These changes indicated that the GO nanosheets were closely adhered to the surface of the CNF film through the medium of Cu 2+ .…”

Section: Resultsmentioning

confidence: 99%

Fabrication and electrochemical properties of flexible transparent supercapacitor electrode materials based on cellulose nanofibrils and reduced graphene oxide

et al. 2019

Polymer Composites

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In this research, flexible transparent supercapacitor electrode materials were fabricated using cellulose nanofibrils (CNFs) and reduced graphene oxide (RGO) via a layer‐by‐layer (LbL) self‐assembly method. First, a transparent film was obtained by vacuum filtration of a CNF suspension, which was isolated from bamboo materials using a combination of 2,2,6,6‐tetramethylpiperidin‐1‐oxyl radical catalytic oxidation and ultrasonic treatment. Subsequently, graphene oxide (GO) was deposited on the surface of the CNF film using Cu2+ as a cross‐linking agent via the LbL self‐assembly technique and then was reduced by L‐ascorbic acid under mild reaction conditions. The degree of reduction of the GO on the CNF film surface was investigated by X‐ray photoelectron spectroscopy (XPS), Raman spectroscopy (Raman), and Fourier transform infrared spectroscopy (FT‐IR); concurrently, the effect of the number of self‐assembly times on the transparency, mechanical properties, and conductivity was also evaluated. The XPS, Raman, and FT‐IR spectral analyses proved that the CNFs/GO composite films were successfully reduced to CNFs/RGO composite films, of which the transparency and mechanical properties decreased with the increase in the number of self‐assembly times, while the conductivity remarkably raised. Based on the analysis of the results, the CNFs/RGO composite film obtained after 18 self‐assembly cycles exhibited excellent transparency, good tensile strength, and a high conductivity. Therefore, the CNFs/RGO composite film was selected to fabricate a supercapacitor electrode material, and the obtained supercapacitor displayed excellent electrochemical properties, in which the areal specific capacitance was 2.25 mF cm−2 at a current density of 0.01 mA cm−2 and the capacitance retention reached 97.3% after 1500 cycles. The presented strategy provides a good reference for the development of transparent and portable energy storage devices.

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“…Furthermore, the microfluidic wet‐spinning technique has been developed to produce continuous graphene‐based fibers . For example, Gao and co‐workers continuously spun polyelectrolyte‐wrapped rGO/CNT core–sheath fibers by one‐step coaxial wet spinning .…”

Section: Fiber‐shaped Supercapacitorsmentioning

confidence: 99%

“…Apart from the good flexibility and mechanical stability, these devices could deliver a high volumetric energy density of 18.2 mWh cm −3 at a power density of 76.4 mW cm −3 . Robust rGO and cellulose nanocrystal (CNC) composite fibers were prepared by Chen et al via wet spinning of GO and CNC mixed solution, followed by chemical reduction of GO . The CNC can not only prevent the restacking of rGO sheets but also improve the mechanical properties of the composite fibers.…”

Section: Fiber‐shaped Supercapacitorsmentioning

confidence: 99%

“…The rGO/CNC composite fibers with a GO/CNC weight ratio of 5:1 showed a tensile strength of 199.8 MPa and a conductivity of 64.7 S cm −1 . The solid‐state SCs based on these rGO/CNC composite fibers possessed a high volumetric capacitance of 208.2 F cm −3 with a good bending stability . By using a coaxial three‐channel spinneret, Yang et al directly wet‐spun a graphene‐based fiber supercapacitor, in which graphene‐based core layer and graphene‐based sheath layer were separated by a thin and continuous gel electrolyte interlayer …”

Section: Fiber‐shaped Supercapacitorsmentioning

confidence: 99%

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Graphene‐Based Nanomaterials for Flexible and Wearable Supercapacitors

Huang

Santiago

Loyselle

et al. 2018

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Along with the quick development of flexible and wearable electronic devices, there is an ever-growing demand for light-weight, flexible, and wearable power sources. Because of the high power density, excellent cycling stability and easy fabrication, flexible supercapacitors are widely studied for this purpose. Graphene-based nanomaterials are attractive electrode materials for flexible and wearable supercapacitors owing to their high surface area, good mechanical and electrical properties, and excellent electrochemical stability. The 2D structure and high aspect ratio of graphene nanosheets make them easy to assemble into films or fibers with good mechanical properties. In recent years, enormous progress has been made in developing flexible and wearable graphene-based supercapacitors. Here, the material and structure design strategies for developing film-shaped and emerging fiber-shaped flexible supercapacitors based on graphene nanomaterials are summarized.

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Robust, hydrophilic graphene/cellulose nanocrystal fiber-based electrode with high capacitive performance and conductivity

Cited by 150 publications

References 42 publications

2D Crystal–Based Fibers: Status and Challenges

2D Crystal–Based Fibers: Status and Challenges

Fabrication and electrochemical properties of flexible transparent supercapacitor electrode materials based on cellulose nanofibrils and reduced graphene oxide

Graphene‐Based Nanomaterials for Flexible and Wearable Supercapacitors

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