Microfluidic-assembled hierarchical macro-microporous graphene fabrics towards high-performance robust supercapacitors

Guan, Tuxiang; Shen, Shuo; Cheng, Zhisheng; Wu, Guan; Bao, Ningzhong

doi:10.1016/j.cej.2022.135878

Cited by 19 publications

(6 citation statements)

References 69 publications

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“…Meanwhile, the slight decrease in the I D / I G value for a-OC compared with their counterparts suggested that the defect-etching process tends to occur in the oxygenic carbon sites rather than the stable graphite domains, resulting in the removal of oxygenated carbon and enhanced the proportion of the graphitic area. 38 The Raman result was in accordance with the XRD and TEM observations.…”

Section: Resultssupporting

confidence: 83%

“…3a and c). 38 Obviously, most of the chemically active C-OH in OC-900 were oxidized by H 2 O 2 and transformed into CvO and O-CvO (Table S2 †). The deconvolution of high-resolution O 1s further confirmed the evolution trend of oxygen-containing functional groups in carbon materials before and after H 2 O 2 activation (Fig.…”

Section: Characterization Of Oc and A-ocmentioning

confidence: 99%

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High performance supercapacitors based on wood-derived thick carbon electrodes synthesized via green activation process

Yan

Zheng

et al. 2022

Inorg. Chem. Front.

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Section: Resultssupporting

confidence: 83%

Section: Characterization Of Oc and A-ocmentioning

confidence: 99%

High performance supercapacitors based on wood-derived thick carbon electrodes synthesized via green activation process

Yan

Zheng

et al. 2022

Inorg. Chem. Front.

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“…As depicted in high-resolution C 1s spectra (Figure S11a), the peaks at 288.5, 287.2, 286.3, and 284.8 eV correspond to O=CÀ O, C=O, CÀ O, and CÀ C groups in the pure graphene oxide fiber, respectively. [25] The following reduction processes favorably eliminate partial oxygencontaining functional groups, giving rise to the improvement of electrical conductivity of graphene, in accordance with the sharply decrease of C=O in PPy@S/rGOFs (Figures S11b and c). Interestingly, the peak at 285.6 eV of PPy@S/rGOFs is distinctly enhanced compared with GOFs and S/rGOFs, suggesting the improvement of CÀ N and CÀ S, which attributes to the composite of PPy@S nanospheres.…”

Section: Methodssupporting

confidence: 58%

Synergistic Interfacial Bonding in Reduced Graphene Oxide Fiber Cathodes Containing Polypyrrole@sulfur Nanospheres for Flexible Energy Storage

Huang

Guan

et al. 2022

Angew Chem Int Ed

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Flexible lithium sulfur batteries with high energy density and good mechanical flexibility are highly desirable. Here, we report a synergistic interface bonding enhancement strategy to construct flexible fibershaped composite cathodes, in which polypyrrole@sulfur (PPy@S) nanospheres are homogeneously implanted into the built-in cavity of self-assembled reduced graphene oxide fibers (rGOFs) by a facile microfluidic assembly method. In this architecture, sulfur nanospheres and lithium polysulfides are synergistically hosted by carbon and polymer interface, which work together to provide enhanced interface chemical bonding to endow the cathode with good adsorption ability, fast reaction kinetics, and excellent mechanical flexibility. Consequently, the PPy@S/rGOFs cathode shows enhanced electrochemical performance and high-rate capability. COMSOL Multiphysics simulations and density functional theory (DFT) calculations are conducted to elucidate the enhanced electrochemical performance. In addition, a flexible LiÀ S pouch cell is assembled and delivers a high areal capacity of 5.8 mAh cm À 2 at 0.2 A g À 1 . Our work offers a new strategy for preparation of advanced cathodes for flexible batteries.

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“…%) (Table S1). The high-resolution C 1s spectra of CNFs and OCNFs-2 (Figure b) reveal five individual component peaks at 291.0 eV for the π–π* shake-up satellite peak, 288.4 eV for carboxyl groups (O–C=O), 286.9 eV for carbonyl groups (C=O), 285.8 eV for alcohol groups (C–OH), and 284.8 eV for graphitic carbon (C–C) . There was a significant increase in the proportion of oxygen-containing functional groups such as alcohol, carbonyl, and carboxyl groups in the C 1s spectrum of OCNFs-2 relative to that of CNFs.…”

Section: Results and Discussionmentioning

confidence: 99%

Super-Hydrophilic Coal-Based Carbon Fibers as Flexible Electrodes for Supercapacitors

Lv,

Wu,

et al. 2023

Energy Fuels

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Carbon nanofibers (CNFs) are a popular choice for independent electrode materials in supercapacitors (SCs) because of their high conductivity, chemical resistance, and exceptional electrochemical stability. However, these fibers often lack surface area and activity due to their inert surfaces. This study introduces a facile method for synthesizing an oxygen-rich coal-based carbon fiber film (OCNFs-x) using electrospinning and HNO3-assisted treatment, which addresses these issues. The resulting materials have an optimal distribution of pore structure and oxygen-containing functional groups, which gives rise to a remarkable capacitance of 252 F/g at a current density of 1 A/g and an excellent cycling performance. For a current density of 2 A/g, the rate of capacity retention is almost 100% over the course of 10,000 cycles. In addition, the assembled symmetric SC shows a remarkable energy density of 6.8 Wh/kg for a power density of 125 W/kg. OCNFs-2 has impressive electrochemical performance that can guide the design of superior electrode materials for high-performance SCs by improving the pore architecture and surface modifications in active carbon fibers.

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Microfluidic-assembled hierarchical macro-microporous graphene fabrics towards high-performance robust supercapacitors

Cited by 19 publications

References 69 publications

High performance supercapacitors based on wood-derived thick carbon electrodes synthesized via green activation process

High performance supercapacitors based on wood-derived thick carbon electrodes synthesized via green activation process

Synergistic Interfacial Bonding in Reduced Graphene Oxide Fiber Cathodes Containing Polypyrrole@sulfur Nanospheres for Flexible Energy Storage

Super-Hydrophilic Coal-Based Carbon Fibers as Flexible Electrodes for Supercapacitors

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