Amine-enriched Graphene Quantum Dots for High-pseudocapacitance Supercapacitors

Li, Zhen; Qin, Ping; Wang, Liang; Yang, Chengshuai; Li, Yanfeng; Chen, Zhiwen; Pan, Dengyu; Wu, Minghong

doi:10.1016/j.electacta.2016.05.030

Cited by 63 publications

(29 citation statements)

References 38 publications

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“…These properties are beneficial in enhancing the wettability of the formed SC electrode, especially in water-based electrolytes [ 92 ]. Meanwhile, the nitrogen-containing surface functional groups on C-QDs, such as an amine-functional-group, were reported to improve SC’s pseudocapacitance performance [ 93 ]. Both edge sites and surface functional groups of the C-QDs are known to be easily modified during material synthesis, which will be discussed later.…”

Section: Properties and Preparation Of Carbon-based Quantum Dots (mentioning

confidence: 99%

Carbon-Based Quantum Dots for Supercapacitors: Recent Advances and Future Challenges

et al. 2021

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Carbon-based Quantum dots (C-QDs) are carbon-based materials that experience the quantum confinement effect, which results in superior optoelectronic properties. In recent years, C-QDs have attracted attention significantly and have shown great application potential as a high-performance supercapacitor device. C-QDs (either as a bare electrode or composite) give a new way to boost supercapacitor performances in higher specific capacitance, high energy density, and good durability. This review comprehensively summarizes the up-to-date progress in C-QD applications either in a bare condition or as a composite with other materials for supercapacitors. The current state of the three distinct C-QD families used for supercapacitors including carbon quantum dots, carbon dots, and graphene quantum dots is highlighted. Two main properties of C-QDs (structural and electrical properties) are presented and analyzed, with a focus on the contribution to supercapacitor performances. Finally, we discuss and outline the remaining major challenges and future perspectives for this growing field with the hope of stimulating further research progress.

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Section: Properties and Preparation Of Carbon-based Quantum Dots (mentioning

confidence: 99%

Carbon-Based Quantum Dots for Supercapacitors: Recent Advances and Future Challenges

et al. 2021

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“…CNTs provided the composites with excellent mechanical properties, interweaved and conductive networks, and fast 3D pathways for both electron transport and electrolyte penetration/diffusion. N‐GQDs possess a high pseudocapacitive activity, enhanced electrolyte wettability due to their higher edge/core atomic ratios and a large amount of doped nitrogen functional groups . The all‐solid‐state flexible supercapacitor electrode based on the all‐carbon ternary system exhibited an ultrahigh areal capacitance up to 400 F g −1 at a current density of 0.3 A g −1 .…”

Section: Introductionmentioning

confidence: 99%

Hierarchical 3D All‐Carbon Composite Structure Modified with N‐Doped Graphene Quantum Dots for High‐Performance Flexible Supercapacitors

Liu

Wang

et al. 2018

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Flexible supercapacitors have shown enormous potential for portable electronic devices. Herein, hierarchical 3D all-carbon electrode materials are prepared by assembling N-doped graphene quantum dots (N-GQDs) on carbonized MOF materials (cZIF-8) interweaved with carbon nanotubes (CNTs) for flexible all-solid-state supercapacitors. In this ternary electrode, cZIF-8 provides a large accessible surface area, CNTs act as the electrical conductive network, and N-GQDs serve as highly pseudocapactive materials. Due to the synergistic effect and hierarchical assembly of these components, N-GQD@cZIF-8/CNT electrodes exhibit a high specific capacitance of 540 F g at 0.5 A g in a 1 m H SO electrolyte and excellent cycle stability with 90.9% capacity retention over 8000 cycles. The assembled supercapacitor possesses an energy density of 18.75 Wh kg with a power density of 108.7 W kg . Meanwhile, three supercapacitors connected in series can power light-emitting diodes for 20 min. All-solid-state N-GQD@cZIF-8/CNT flexible supercapacitor exhibits an energy density of 14 Wh kg with a power density of 89.3 W kg , while the capacitance retention after 5000 cycles reaches 82%. This work provides an effective way to construct novel electrode materials with high energy storage density as well as good cycling performance and power density for high-performance energy storage devices via the rational design.

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“…An accessible high active area and hierarchical pore structures are exceptional aspects for the surged utilization of coal in electrochemical devices. In reference to the zerodimensional structures, the conjugated carbon skeleton of Graphene Quantum Dots (GQDs) can construct complex and conductive assembly flexible for migration property (Li et al 2016). The active sites at the enriched edges establish hybrid capacitive energy storage mechanisms (Wu et al 2012).…”

Section: Structural Characteristicsmentioning

confidence: 99%

“…From the electrochemical study, an open-circuit voltage of 0.74 V and 0.61 V at a current density of 150 mA/cm 2 were observed for bituminous and sub-bituminous coal respectively. Stable performance of fuel cell was achieved by Li et al (2016) using AFC as fuel. A gradual reduction in the operational temperature was also examined for the AFC using fuel cell in comparison to conventional carbon fuel.…”

Section: Fuel Cellmentioning

confidence: 99%

Electrochemical efficacies of coal derived nanocarbons

Thomas

Balachandran

2020

Int J Coal Sci Technol

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Carbon based nanomaterials are acknowledged for their admirable optical, electrical, mechanical characteristics and broad class of applications. Choice of precursor and simple synthesis techniques have decisive roles in viable production and commercialization of carbon produce. The intense demand to develop high purity carbon nanomaterials through inexpensive techniques has promoted usage of fossil derivatives as feasible source of carbon. Coal serves as a naturally available, abundant and cheap feedstock for carbon materials. From the crystalline clusters of aromatic hydrocarbons in a cross-linked network, carbon nanostructures can easily be extracted through green synthesis routes. It promotes a potent alternative for the cost effective and scaled up production of nanocarbon. The well-developed pores distribution, presence of numerous active sites and appropriate migration channels for ions enhance the electrochemical parameters necessary for the fabrication of supercapacitors, batteries and electrochemical sensors. The metallic impurities contained in coal contribute towards faradic redox reactions required for an efficient electrode modification. In this review, the potential uses of coal based carbon nanomaterials in energy storage and environmental sectors are discussed in detail.

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Amine-enriched Graphene Quantum Dots for High-pseudocapacitance Supercapacitors

Cited by 63 publications

References 38 publications

Carbon-Based Quantum Dots for Supercapacitors: Recent Advances and Future Challenges

Carbon-Based Quantum Dots for Supercapacitors: Recent Advances and Future Challenges

Hierarchical 3D All‐Carbon Composite Structure Modified with N‐Doped Graphene Quantum Dots for High‐Performance Flexible Supercapacitors

Electrochemical efficacies of coal derived nanocarbons

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