Graphene-based ordered mesoporous carbon hybrids with large surface areas for supercapacitors

Deng, Yaxin; Xu, Aifei; Lu, Wenxian; Yu, Yanhua; Fu, Cheng; Shu, Tingting

doi:10.1039/c7nj03923a

Cited by 10 publications

(5 citation statements)

References 54 publications

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“…Moreover, G@mesoNC-20, G@mesoNC-40 and G@mesoNC-60 nanosheets electrodes show a stable capacitance retention and retains 99.6%, 99.9% and 99.7% of their initial response after 2500 cycles at 10 A g −1 (figure 4(f)), revealing a respectable cyclic stability as working electrode in supercapacitor. The results show that the specific capacitance of G@mesoNC-40 is significantly higher than that of the other samples reported previously (table S3) [42][43][44][45][46].…”

Section: Resultscontrasting

confidence: 60%

Synthesis of sandwich-like graphene@mesoporous nitrogen-doped carbon nanosheets for application in high-performance supercapacitors

et al. 2019

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Nanostructured mesoporous carbon materials have been an attractive material for electrochemical energy storage in the recent decades. However, the controllable synthesis of two-dimensional mesoporous carbon with tunable thickness and desired pore structure is highly challenging. Here, a series of graphene@mesoporous nitrogen-doped carbon (denoted as G@mesoNC) core–shell structured nanosheets with tunable thicknesses have been fabricated via a sample hydrothermal method by using cellulose as the green and cheap carbon precursor. The resultant G@mesoNC nanosheets exhibit a distinct sandwich-like structure with tunable thicknesses (from 10 to 30 nm), a large surface area (562 m2 g−1), a narrow pore size distribution (2.3 nm) and a high nitrogen content (7.95%). Significantly, when being used as the electrode for supercapaciors, the resultant G@mesoNC nanosheets showcase a high specific capacitance of 264 F g−1. Most importantly, there is no substantial capacitance decay after 2500 cycles, indicating the perfect cyclic stability of G@mesoNC nanosheets. Our method paves a new way for synthesizing carbon electrodes for energy storage.

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Section: Resultscontrasting

confidence: 60%

Synthesis of sandwich-like graphene@mesoporous nitrogen-doped carbon nanosheets for application in high-performance supercapacitors

et al. 2019

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“…Highly ordered mesoporous materials are of interest in numerous applications such as batteries, − fuel cells, , supercapacitors, sensors, gas storage, , and catalyst supports − due to their favorable properties including high specific surface area and good physical and chemical stability. A popular method for synthesizing these materials is hard templating, which involves the deposition of precursor into the ordered mesopores of silicon-based materials via wetting or vapor deposition, followed by the removal of the silica template.…”

Section: Introductionmentioning

confidence: 99%

A Designed Template Removal Method for Obtaining Mesoporous Films with Highly Ordered Structure by Rapid Thermal Processing Technique

Sun

Huang

Yang

et al. 2023

ACS Appl. Energy Mater.

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The soft-templating methodology is a highly effective approach to prepare ordered organic mesoporous structures. However, in the traditional thermal-induced template removal process, the resultant mesoporous films often suffer from severe shrinkage, which causes a reduction in pore size and order. To overcome these limitations, we developed a strategy that combines rapid thermal processing (RTP) with dynamic circulation. This approach aims to optimize the ordered mesostructures of the films after template removal. The mesoporous structure was evaluated by various analytical techniques, including XRD, NMR, TEM, and grazing incident small angle X-ray scattering (GISAXS). Our results demonstrate that the dynamic thermal processing method leads to a high-quality mesoporous films with significantly reduced shrinkage in the mesoporous structure. Specifically, the d-spacing of mesopores decreased only from 10.4 to 9.1 nm when treated with RTP, which is smaller than the mesoporous films treated using traditional heat processing (reduced to 7.7 nm). Furthermore, dynamic cycling led to an increase in the domain size of the ordered structure from 49.1 to 199.7 nm. These findings were confirmed by cross-sectional TEM, consistent with the values obtained from the GISAXS analysis. Finally, we discuss the feasibility and efficiency of the proposed thermal treatment method, which can provide a straightforward approach to improve the ordered degree in mesoporous films.

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“…As known to all, reduced graphene oxide (rGO) is one of the most promising electrode materials for EDLCs due to its large specific surface area, exceptionally high electronic conductivity and high theoretical specific capacitance (Booth et al, 2008;Lee et al, 2008;Ke and Wang, 2016). When rGO is introduced into the composite properly, it enhances not only the electronic conductivity of composite, but also the structural stability of the electrode (Ke and Wang, 2016;Deng et al, 2017). Therefore, taking reduced graphene oxide as a framework is an effective way to reinforce the mechanical strengths of the composites.…”

Section: Introductionmentioning

confidence: 99%

Controlled Synthesis of NixCoyS4/rGO Composites for Constructing High-Performance Asymmetric Supercapacitor

Dong

Wang

et al. 2019

Front. Mater.

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Nickel-cobalt sulfides (Ni x Co y S 4) are promising supercapacitor materials due to their high capacitance, while the sluggish kinetics in terms of charge transfer limits their energy density. To achieve both high energy and power density for the Ni x Co y S 4-based supercapacitor, sulfur-doped reduced graphene oxide (rGO) is incorporated into Ni x Co y S 4 by an in situ growth-ion exchange strategy to synthesize Ni x Co y S 4 /rGO composites. Profited from the synergetic effect between rGO and Ni x Co y S 4 , the Ni 1.64 Co 2.40 S 4 /rGO electrode delivers high specific capacitance of 1,089 F g −1 at 1 A g −1 , and remains 92.6% of its original capacitance at 20 A g −1 (1,008 F g −1). Asymmetric supercapacitors assembled with active carbon (AC) and Ni 1.64 Co 2.40 S 4 /rGO (Ni 1.64 Co 2.40 S 4 /rGO//AC) offer both high specific capacitance (265.5 F g −1 at 1 A g −1) and superior rate capability at 50 A g −1 (recovering 63.6% of the capacitance determined at 1 A g −1). In addition, the assembled device exhibits a high capacitance retention of 92.6% after 10,000 cycles at 10 A g −1 , which implies an excellent cyclic stability. Ragone plot reveals that the energy density of Ni 1.64 Co 2.40 S 4 /rGO//AC asymmetric supercapacitor do not vanish as it delivers 30.4 Wh kg −1 at 10 kW kg −1 , demonstrating its promising application.

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Graphene-based ordered mesoporous carbon hybrids with large surface areas for supercapacitors

Abstract: Graphene-ordered mesoporous carbon hybrids exhibited advanced specific capacity, high energy density and power density, and long cycle life.

Cited by 10 publications

References 54 publications

Synthesis of sandwich-like graphene@mesoporous nitrogen-doped carbon nanosheets for application in high-performance supercapacitors

Synthesis of sandwich-like graphene@mesoporous nitrogen-doped carbon nanosheets for application in high-performance supercapacitors

A Designed Template Removal Method for Obtaining Mesoporous Films with Highly Ordered Structure by Rapid Thermal Processing Technique

Controlled Synthesis of NixCoyS4/rGO Composites for Constructing High-Performance Asymmetric Supercapacitor

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