Graphene Hydrogel Decorated with N, O Co-Doped Carbon Dots for Flexible Supercapacitor Electrodes

Xu, Lanshu; Dun, Xuji; Zou, Jixin; Li, Yue; Jia, Mengying; Cui, Linlin; Gao, Jianmin; Jin, Xiaojuan

doi:10.1149/2.1011810jes

Cited by 22 publications

(9 citation statements)

References 56 publications

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“…TEM image of carbon quantum dot liquid dispersion shows the spherical morphology of N,S GCQDs, with an average size of 2.6 nm (Figure 1a,d). [39,45] N CQDs, and sucrose CQDs exhibit similar size and spherical morphology (Figure S1, Supporting Information).…”

Section: Resultsmentioning

confidence: 95%

“…[37] Recent literature reports on carbon quantum dots added to inorganic pseudocapacitive electrode materials, such as metal oxides and conducting polymers, not only to facilitate electronic and ion transport during the charging and discharging processes, but also to enhance the charge storage process by adding faradaic activity (see Table S1, Supporting Information). [38][39][40] Carbon quantum dots with metal oxides and conducting polymers exhibit excellent electrochemical performance, [38,41] although the charge-discharge capacity of pristine carbon quantum dots is low. [42] The aforementioned mixtures possess larger surface area, higher electronic conductivity, and better structural mechanical stability than each individual material.…”

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confidence: 99%

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3D Network of Sepia Melanin and N‐ and, S‐Doped Graphitic Carbon Quantum Dots for Sustainable Electrochemical Capacitors

Gouda

Manioudakis

Naccache

et al. 2021

Advanced Sustainable Systems

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Access to clean and affordable energy for all is one of the 17 main sustainable development goals of the UN. [1] The increasing demand for energy due to worldwide population growth and changes in lifestyle, along with the depletion of natural resources at an alarming rate and concerns for the environment, are motivating the change from fossil fuels to intermittent renewable sources, such as wind and sun. The intermittency of energy received from the sun, however, highlights the need for efficient energy storage devices. Electrochemical capacitors (supercapacitors), despite having lower specific energy than batteries, are among the most prominent of these devices, owing to their high power density, fast charge−discharge (10 times faster than commercially available lithium-ion batteries), long cycle life (rated at 500 000 duty cycles) and high levels of reliability and operational safety. [2,3] They are attractive for applications such as autonomous sensors in planes, hybrid electric vehicles, portable devices, and memory backup systems that require high power levels. [2,4] Commercially available energy storage devices often utilize toxic electrode materials (e.g., lead, nickel, cadmium, cobalt and mercury in batteries) whose extraction can have dramatic social, environmental, and geopolitical impact. [5] Energy storage technologies that, aside from providing high energy/high power, are more affordable, sustainable, and environmentally friendly than conventional counterparts need to be developed. [6] The choice of a supercapacitive electrode material has been limited to electrical double layer (EDL) carbon-based materials [7] as well as pseudocapacitive materials such as metal oxides, [8] conducting polymers, [9,10] and, very recently, metal-organic frameworks (MOFs) [11] and MXenes. [10,12] Many studies in the literature have reported on the use of organic redox materials, to enhance the supercapacitive performance beyond that provided by EDLs. [13,14] Organic materials with redox active groups, such as phenol, carbonyl, quinones, carboxy, or amines [5] are becoming promising candidates for next-generation sustainable energy Organic electrode materials operating in aqueous electrolytes offer the opportunity to avoid toxic, critical, and expensive materials for electrochemical energy storage. When deposited on carbon current collectors, redox active organic materials add faradaic to electrostatic capacitance contribution to the electrodes. Here, a 3D network electrode material is reported upon, based on sepia melanin, a quinone macromolecule, and nitrogen-and sulfur-doped graphitic carbon quantum dots (N,S GCQDs) designed to achieve good electronic conductivity and electrolyte wettability. The effect of various undoped and doped carbon quantum dots is also investigated, synthesized from acetic acid and sucrose instead of graphite, on the electrochemical performance of sepia melanin. Sepia/N,S GCQD shows optimum areal capacitance (≈180 mF cm −2 ) that is about twice as high as sepia (≈77 mF cm −2 ) with lower...

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Section: Resultsmentioning

confidence: 95%

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confidence: 99%

3D Network of Sepia Melanin and N‐ and, S‐Doped Graphitic Carbon Quantum Dots for Sustainable Electrochemical Capacitors

Gouda

Manioudakis

Naccache

et al. 2021

Advanced Sustainable Systems

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“…The composite hydrogel electrode exhibited a specific capacitance of 335.1 F g –1 at 1 A g –1 , and a good mechanical flexibility with about 90.6% capacitance retention after 500 bending/unbending cycles. The flexible symmetric supercapacitor showed a high specific capacitance of 121.0 F g –1 , and a cycling stability of 83.4% after 10000 charge/discharge cycles at 5 A g –1 . This group further took a step forward in related work later .…”

Section: Applications Of Cds In Electrochemical Supercapacitorsmentioning

confidence: 98%

“…The flexible symmetric supercapacitor showed a high specific capacitance of 121.0 F g −1 , and a cycling stability of 83.4% after 10000 charge/ discharge cycles at 5 A g −1 . 36 This group further took a step forward in related work later. 37 They used lignosulfonates as a precursor to prepare GQDs, and then combined the GQDs with GO through a hydrothermal process to obtain GQDmodified graphene hydrogel (GH-GQD) for supercapacitor electrodes (Figure 1a).…”

Section: Applications Of Cds In Electrochemical Supercapacitorsmentioning

confidence: 99%

Applications of Carbon Dots in Electrochemical Energy Storage

Jiang

Guan

et al. 2022

ACS Appl. Electron. Mater.

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As one kind of carbon nanomaterials, since their discovery at the beginning of the century, carbon dots (CDs) have been attracting extensive attention in sensing, bioimaging, catalysis, organic light-emitting diodes, etc. due to their rich and diverse physical and chemical properties. Although the precise structures of CDs need to be further analyzed and elaborated, it is confirmed that there are many functional groups on the surfaces including amino, hydroxyl, carboxyl and thiol, depending on the precursors and preparation processes used. The crystalline/amorphous conjugated graphite-like sp2 domains and segments inside the CDs provide good electrical conductivity and photoelectric conversion capability. The applications of CDs in electrochemical energy storage have been carried out extensively and become a hot topic in recent years. In this review, the recent progress about the applications of CDs in typical electrochemical energy storage devices including supercapacitors, lithium-ion batteries, sodium-ion batteries and potassium-ion batteries is outlined and summarized. The relationships between material structures and device performances are mainly analyzed. Finally, it is anticipated that the development of CDs can continuously boost the study of high-efficiency energy storage devices profoundly.

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“…There has been a significant amount of research conducted on the subject of doping GQDs, which includes single-element doping with elements, such as sulfur [184, 284,285], phosphorus [286], nitrogen [287], fluorine [288], boron [289] and silicon [290], as well as multielement doping with combinations, such as nitrogen-sulfur [291][292][293][294][295][296], nitrogen-phosphorus [297,298], nitrogen-boron [299][300][301] and nitrogen-oxygen [302,303]. To achieve better performance, multielement doping consisting of four elements has also been reported [304].…”

Section: Dopingmentioning

confidence: 99%

Graphene quantum dots: preparations, properties, functionalizations and applications

Tian,

Tang,

Teng

et al. 2024

Mater. Futures

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Due to its zero-dimensional property, graphene quantum dots (GQDs) has quantum confinement effect on the internal charge, so they show many properties different from the parent two-dimensional graphene, such as strong fluorescence, non-zero band gap and easily soluble in solvents. As a member of the family of carbon materials, GQDs also has biocompatibility and low toxicity, which is one of the reasons why GQDs can be widely used in the biomedical field .The edge effect of GQDs is also particularly important. By modifying the edge of GQDs, the performance of GQDs can be regulated. A lot of preparation technology of GQDs, probably can be divided into three categories, and top-down, bottom-up and chemical method, chemical method is different from other literature classification, mainly considering the certain of the preparation of GQDs way, not directly to block materials or direct synthesis of small molecule materials for GQDs, but through intermediate in chemical means under the action of changes and form GQDs. The detailed introduction of the optical, electrical, thermal and magnetic properties of GQDs is the premise of the performance regulation of GQDs. In addition to inheriting the excellent properties of graphene, GQDs also expand the properties of the parent material. The functionalization of GQDs mainly includes the doping technology of introducing heteroatom and the composite technology of combining with other substances to improve the performance of other substances. The performance of these functionalized products is also discussed. The original and functionalized properties of GQDs are based on the application of GQDs. In recent years, GQDs has been used in many fields, including optics, electricity, optoelectronics, biomedicine, energy, agriculture and some emerging interdisciplinary fields. Through the introduction and discussion of the recent research achievements of GQDs, this review mainly highlights the huge potential value of GQDs and puts forward the direction of the development of GQDs in the future.

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Graphene Hydrogel Decorated with N, O Co-Doped Carbon Dots for Flexible Supercapacitor Electrodes

Cited by 22 publications

References 56 publications

3D Network of Sepia Melanin and N‐ and, S‐Doped Graphitic Carbon Quantum Dots for Sustainable Electrochemical Capacitors

3D Network of Sepia Melanin and N‐ and, S‐Doped Graphitic Carbon Quantum Dots for Sustainable Electrochemical Capacitors

Applications of Carbon Dots in Electrochemical Energy Storage

Graphene quantum dots: preparations, properties, functionalizations and applications

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