Graphene-quantum-dots-induced MnO2 with needle-like nanostructure grown on carbonized wood as advanced electrode for supercapacitors

Zhang, Weiye; Yang, Yingni; Xia, Rongqi; Li, Yanchen; Zhao, Junqi; Lin, Lin; Cao, Jiaming; Wang, Qihang; Liu, Yi; Guo, Huajun

doi:10.1016/j.carbon.2020.02.039

Cited by 113 publications

(61 citation statements)

References 38 publications

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“…In addition, the inside of the channels is filled with paraffin wax, and the section to be explored is marked in the model diagram. The frequency parameter (8) of the simulation calculation process was set to 10.72GHz. The time-average power flow ( ) of section 1 and section 2 are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Fortunately, the biomassderived carbon overcome the shortcomings of man-made carbon materials with many characteristics such as light weight, large natural reserves and low cost. Nowadays, the natural wood-derived carbon materials with through channels parallel to the growth direction have been successfully applied in many fields, for example, energy storage materials, catalysts and sensors [7][8][9]. The three-dimensional (3D) skeleton composed of orderly-arrangement and through channels existing in wood-derived carbon can also be applied to MA materials, which not only is favor of microwave scattering and multireflections to prolong the propagation path of EMW [10] and forms an efficient conductive network to enhance the conductive loss [11], but also provides a load position for magnetic materials to improve impedance matching and cause magnetic loss [12].…”

Section: Introductionmentioning

confidence: 99%

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Carbonized wood with ordered channels decorated by NiCo2O4 for lightweight and high-performance microwave absorber

Qin

et al. 2021

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Wood-derived carbon has a 3D porous framework composed of through channels along the growth direction, which is a suitable matrix for preparing electromagnetic wave (EMW) absorbing materials with low-cost, light-weight, environmentally friendly and excellent MA performance. Herein, the carbonized wood decorated by short cone-like NiCo2O4 (CW@NiCo2O4) with highly ordered straightway channels architecture were successfully manufactured through a facile calcination procedure. Finite Element Analysis (FEA) simulation is carried out to detect the interaction between the prepared material and EMW when the ordered channels are arranged in different directions. Simultaneously, the microwave absorption properties of all samples are investigated in terms of complex permittivity and permeability. The horizontal arrangement of the through channels of CW@NiCo2O4 (H-CW@NiCo2O4) exhibits a strong reflection loss value of -64.0 dB at 10.72 GHz with a thickness of 3.62 mm and a low filling ratio of 26wt% (with the density of 0.98g·cm− 3), and the effective absorption bandwidth (EAB) is 8.08 GHz (9.92-18.0 GHz) at the thickness of 3.2 mm. The extremely advantageous structure of H-CW@NiCo2O4 is the key to achieving excellent MA property, which enables multiple EMW loss mechanisms to be effectively realized. What’s more, the introduction of NiCo2O4 increases the values of \({\epsilon }^{\text{'}}\) and \({\epsilon }^{\text{'}\text{'}}\), resulting in enhanced dielectric loss. This research provides a low-cost, sustainable and environmentally friendly strategy for using carbonized wood to fabricate microwave absorbers with strong attenuation capabilities and lightweight.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Carbonized wood with ordered channels decorated by NiCo2O4 for lightweight and high-performance microwave absorber

Qin

et al. 2021

Preprint

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“…Moreover, a prototype asymmetric SC was assembled according to the GQDs/MnO 2 -3//nitrogen-doped graphene design, which showed elevated energy density (118 W h kg −1 at power density = 923 W kg −1 ). Other nanostructured MnO 2 forms were investigated as well, with electrodes based on the combination of GQDs and needle-like MnO 2 [ 206 ] returning electrodes with 2712 mF cm −2 at a current density of 1.0 mA cm −2 . In another study [ 207 ], Zheng et al surpassed the 2000 specific capacitance threshold as well, using Ni(OH) 2 nanosheets mixed with amino-functionalized GQDs (2653 F g −1 at 1 A g −1 ).…”

Section: Gqd Applications In Energy-related Applicationsmentioning

confidence: 99%

Shedding Light on Graphene Quantum Dots: Key Synthetic Strategies, Characterization Tools, and Cutting-Edge Applications

2021

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During the last 20 years, the scientific community has shown growing interest towards carbonaceous nanomaterials due to their appealing mechanical, thermal, and optical features, depending on the specific nanoforms. Among these, graphene quantum dots (GQDs) recently emerged as one of the most promising nanomaterials due to their outstanding electrical properties, chemical stability, and intense and tunable photoluminescence, as it is witnessed by a booming number of reported applications, ranging from the biological field to the photovoltaic market. To date, a plethora of synthetic protocols have been investigated to modulate the portfolio of features that GQDs possess and to facilitate the use of these materials for target applications. Considering the number of publications and the rapid evolution of this flourishing field of research, this review aims at providing a broad overview of the most widely established synthetic protocols and offering a detailed review of some specific applications that are attracting researchers’ interest.

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“…carboxylic acid and hydroxyl groups, which allows the incorporation of ller material into the wood matrix [5]. As such, wood is a fascinating material that has received signi cant research interest in recent years, whereby several techniques such as drop-casting, carbonization, and CO 2 laser scribing process [6][7][8][9][10][11][12][13][14] have been attempted so as to improve its electrical conductivity. Even though these strategies have generally resulted in the fabrication of electrically conductive wood-based products, these techniques often result in considerable coating spalling, non-uniform distribution of conductive llers, or a signi cant increase in the density of the composite.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, these techniques usually consume large amount of energy which indirectly increases the cost and intensi es the pollution concerns [15][16][17]. Furthermore, some of these methods such as CO 2 laser scribing process may consider to be technologically sophisticated for e cient large-scale production [10,11]. As such, identi cation of suitable conductive material, and fabrication strategy are some of the vital factors in realizing functional conductive wood composite.…”

Section: Introductionmentioning

confidence: 99%

Achieving Highly Anisotropic Three-Dimensional, Lightweight, and Versatile Conductive Wood-Graphene Composite

Wang

Zhang

Wang

et al. 2021

Preprint

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Functionality of wood has to evolve with time to adapt to the emerging needs in society. In this work, endowing electrical conductivity to the insulating wood by adding graphene into the wood matrix to form a conductive wood-graphene composite (conductive wood) via a facile and environmentally benign fabrication technique. The rationale of fabricating conductive wood is of two folds: (1) The high suitability of wood as a renewable matrix due to its porous network and mechanically robust monolithic structure. (2) The need to explore reasonable strategy to adequately translate the properties of graphene from microscopic level to macroscopic level. The conductive wood is able to preserve both the natural features of wood (to function as mechanical scaffold) and the conductivity of graphene. An outstanding electrical conductivity (volume resistivity of 36.7 Ω·cm) is achieved for the conductive wood, while it can maintain a low bulk density of 0.44 g cm-1. More significantly, the conductive wood demonstrates a highly three-dimensional anisotropic conductivity that makes it a highly versatile conductor in various applications. Hence, this lightweight conductive wood may contribute towards a great electronic revolution and as an encouraging strategy to repurpose the function of wood in this new era.

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Graphene-quantum-dots-induced MnO2 with needle-like nanostructure grown on carbonized wood as advanced electrode for supercapacitors

Cited by 113 publications

References 38 publications

Carbonized wood with ordered channels decorated by NiCo2O4 for lightweight and high-performance microwave absorber

Carbonized wood with ordered channels decorated by NiCo2O4 for lightweight and high-performance microwave absorber

Shedding Light on Graphene Quantum Dots: Key Synthetic Strategies, Characterization Tools, and Cutting-Edge Applications

Achieving Highly Anisotropic Three-Dimensional, Lightweight, and Versatile Conductive Wood-Graphene Composite

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