Controllable Morphologies of Carbon Microspheres via Green Hydrothermal Method Using Fructose and Xylose

Cheng, Youliang; Yang, Mannan; Fang, Changqing; Chen, Jing; Bai, Mengsha; Su, Ji

doi:10.1246/cl.170592

Cited by 18 publications

(6 citation statements)

References 23 publications

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“…In contrast to raw biomass, using saccharides as carbon sources can produce carbonaceous materials with highly regular morphologies in micro‐ and nanoscale. Herein, we used xylose as the HTS precursor, which can lead to higher yield, better morphology, and nearly monodispersed carbon spheres, and studied the variations of the morphologies and porous structures of the prepared ACs with the processing parameters. Secondly, we analyzed the electrochemical performance of the ACs of different structures, including cyclic voltammetry, specific capacitance, electrochemical impedance spectroscopy (EIS), energy and power densities, and long‐term stability.…”

Section: Introductionmentioning

confidence: 99%

High‐performance activated carbons for electrochemical double layer capacitors: Effects of morphology and porous structures

et al. 2019

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Summary In this work, we prepare a series of activated carbons (ACs) from xylose with different combinations of hydrothermal synthesis (HTS) and chemical activation with KOH. The prepared ACs exhibit a variety of morphologies and porous structures, which depend on the conditions used in the hydrothermal synthesis and the chemical activation. The largest surface area (SBET) of the prepared ACs, which is calculated by the Brunauere Emmette Teller (BET) method, is ~3500 m2/g, and the largest volume fraction of mesopores of the prepared ACs is 60%. The correlations between the specific electrochemical properties of the ACs and the structures of the ACs (ie, porous structures and morphologies) are discussed. Spherical ACs exhibit superior rate performance with low impedance. The ACs with three‐dimensional interconnected network of large surface area and porosity possess high specific capacitance. The largest specific capacitance reaches 340 F/g at a current density of 0.5 A/g and 220 F/g at a current density of 50 A/g, which are superior or comparable to those of similar systems. The long‐term capacitance retention is ~86.8% after 10 000 cycles at a current density of 50 A/g. The energy density reaches 48 Wh/kg at a power density of 13.6 kW/kg.

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Section: Introductionmentioning

confidence: 99%

High‐performance activated carbons for electrochemical double layer capacitors: Effects of morphology and porous structures

et al. 2019

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“…The first reported carbon spherules were synthesized by HTC of sucrose at 190 o C through regulating the concentration of sucrose solution and reaction time in 2001 [15]. After that, more works were focused on the HTC of different saccharides at low temperature, including glucose, sucrose, starch and cellulose [13,[16][17][18][19][20][21]. Meanwhile, the mechanism of hydrothermal and porous carbon products formation from different materials was also discussed with the characterization of XRD, FTIR, NMR and XPS [14,[22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Carbon Microspheres From Waste Cotton Textiles By Hydrothermal Carbonization

Zhang¹,

Hou²,

Guo³

et al. 2019

Journal of Renewable Materials

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Carbon microspheres were prepared from waste cotton fibers by hydrothermal carbonization (HTC) with the addition of copper sulphate in this work. The important influence factors, temperature, concentration of copper sulphate, resident time were explored here. The smooth and regular carbon microspheres could be formed at 330°C with 0.15 wt% copper sulphate after 6 h from waste cotton fibers. The crystal structures of cotton fibers were destructed in a short resident time with 0.15 wt% copper sulphate from SEM images and XRD patterns of solid products. This strategy provides a new, mild and efficient method to prepare carbon microspheres from waste cotton fibers by HTC. FTIR spectra verified that the abundant functional groups existed on the surface of synthesized carbon microspheres. From XPS and element analysis results, the copper sulphate participated in the forming process of carbon microspheres indeed. The presence of copper sulphate in the carbon microspheres provided a possibility for the application in antibacterial field. Besides, the catalytic mechanism of copper sulphate on the hydrolysis and carbonization of waste cotton fibers were also discussed. In conclusion, the copper sulphate is an efficient agent for preparing carbon microspheres by HTC from waste cotton fibers.

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“…HTC of saccharides is known to produce microspherical hydrochar. 4 Numerous saccharides, such as glucose, 5,6 sucrose, 7 cyclodextrin, 8 fructose, 9 xylose, 10 cellulose, 11 agarose 12 and starch, 13 have been shown to result in microspheres (MS) with mostly Gaussian size distributions. The underlying chemical mechanisms during HTC of saccharides include dehydration, condensation, polymerization, and aromatization.…”

Section: Introductionmentioning

confidence: 99%

Hard carbon microspheres with bimodal size distribution and hierarchical porosity via hydrothermal carbonization of trehalose

et al. 2023

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Controllable Morphologies of Carbon Microspheres via Green Hydrothermal Method Using Fructose and Xylose

Cited by 18 publications

References 23 publications

High‐performance activated carbons for electrochemical double layer capacitors: Effects of morphology and porous structures

High‐performance activated carbons for electrochemical double layer capacitors: Effects of morphology and porous structures

Preparation and Characterization of Carbon Microspheres From Waste Cotton Textiles By Hydrothermal Carbonization

Hard carbon microspheres with bimodal size distribution and hierarchical porosity via hydrothermal carbonization of trehalose

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