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KW - Co-doped mesoporous carbon

T1 - Synthesis of graphitic ordered mesoporous carbon with cubic symmetry and its application in lithium-sulfur batteries

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H., Kruk, M., Jaroniec, M., 2001, Ordered mesoporous carbons, Adv.

The outcomes revealed that the reaction time in ethanol solvent is slow due to NaBH4 barely solving in ethanol and the response rate is tardy. In addition, the reaction amount in water solvent is gradual because although dielectric regular and solubility of normal water in NaBH4 is substantial, carbon mesoporous CMK-3 contain hydrophobic nature. It causes substances and catalyst cannot have got perfect interaction alongside one another. The hydrophobic character of acetonitrile and oxolane are higher than various other solvent that presented on top of; thus, both of these solvent have significantly more similarity to hydrophobic characteristics of CMK-3. In addition, dipole instant of acetonitrile is greater than other solvent. Thanks to this feature, the reaction rate rise. Whereas the methanol solvent has got mediate circumstance of dielectric constant, solubility in NaBH4, and hydrophobic effect aspect, the reaction period diminish. It is noteworthy to mention that the combination of most these factors jointly cause this process. Regarding these situation, water and acetonitrile were finally determined as the solvent for the response because of their environmental friendly and highly efficient, respectively; and all other optimization and reaction individually accomplished by these two solvent.

The mesoporous carbon was synthesized under various conditions of synthesis time and calcination.

The results show that the surface area of the mesoporous carbon material varies with the SiO2/C mass ratio and reaches the largest at 1.0 of SiO2/C.

Microporous and Mesoporous Materials - Journal - …

Eight different types of mesoporous carbon, which were designated as MC1, MC2, MC3, MC4, MCT1, MCT2, MCT3, and MCT4, were prepared depending upon preparation conditions.

N2 adsorption-desorption, scanning electron microscopy, and transmission electron microscopy were used to characterize the mesoporous carbon and its supported Ru catalysts.

Synthesis of mesoporous carbon nanospheres for …

The analysis of mesoporous carbon characteristics showed that the calcination of silica stabilized the mixed structure of silica and carbonic complex, and made the particle uniform.

AB - The lithium-sulfur (Li-S) battery faces a couple of major problems in practical applications, including the low conductivity of sulfur and the dissolution of polysulfides. A cathode constructed using a composite of sulfur and ordered mesoporous carbon (OMC) is a promising solution to both problems, as OMCs can have high conductivity and a complex pore structure to trap polysulfides. In this work, we demonstrate that performance of the Li-S battery can be significantly enhanced by using an OMC with a high degree of graphitization and a pore network with cubic symmetry. This graphitic OMC (GOMC) can be produced in a single step using iron phthalocyanine precursor and a silica template with cubic Ia3d symmetry. The GOMC-sulfur (GOMC/S) composite is 175% higher in electrical conductivity compared to the typical OMC-sulfur (OMC/S) composite. In addition, the three-dimensional pore network in GOMC prevents the migration of dissolved polysulfides. These characteristics of GOMC contribute to the improved rate capability and cyclability of the corresponding Li-S battery.

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  • Carbon, mesoporous - 5G size | Sigma-Aldrich

    KW - mesoporous carbon

  • Morphology Control of Ordered Mesoporous Carbon …

    Effect of pore structure of mesoporous carbon on its supported Ru catalysts for ammonia synthesis[J].

  • Synthesis of ordered mesoporous carbon …

    H., 2000, Characterization of ordered mesoporous carbons synthesized using MCM-48 silica as templates, J.

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Mesoporous carbon nanomaterials as environmental adsorbents.

The specific surface, pore volume and the pore size of the CMK-3, PVSA/CMK-3 and Ni/PVSA/CMK-3 samples are summarized in Desk 1. All samples exhibit a type IV adsorption isotherm with an H1 hysteresis loop by capillary condensation at relative pressure around 0.3-0.7 (Fig. 4). It is clear in table 1 that the PVSA/CMK-3 and Ni/PVSA/CMK-3 exhibits a more compact specific surface, and pore volume compared to those of genuine CMK-3. Because of the successful incorporation of the poly(vinyl sulfonic acid) in to the mesoporous carbon. As is seen, pore diameter rises in the PVSA/CMK-3 and Ni/PVSA/CMK-3 in comparison to CMK-3. This evidence shows the incorporation and expansion of hyperbranched polymers and therefore generates the pressure (physical strain on the wall of the channels) in the CMK-3 mesoporous. By adding Ni nanoparticles in to the PVSA/CMK-3, the specific surface and pore volume lower, asserting that nickel nanoparticles are located inside the pores of the CMK-3. Regardless of the fact that there are significant decreases in the pore volume level and surface area, the pores of Ni/PVSA/CMK-3 were not blocked by deposition of the hyperbranched homopolymer and nickel nanoparticles. Furthermore, the BJH pore size distribution curves of the PVSA/CMK-3 and Ni/PVSA/CMK-3 will be exhibited a narrow pore size distribution (Fig. 5). It clarifies that the homopolymer and nickel nanoparticles are satisfactory distributed on the stations of the Ni/PVSA/CMK-3. This end result is agreement with TEM analysis and shows the powerful part of the hyperbranched polymer to entrap and uniformly disperse nickel nanoparticles.

Micro/Mesoporous Carbon Materials for Hazardous …

Mesoporous carbon CMK-3 was prepared using mesoporous silica SBA-15 as template and sucrose as the carbon precursor. 1.0 g SBA-15 was put into 5 mL aqueous option containing 1.25 g (3.65 mmol) sucrose and 0.14 g (1.42 mmol) of H2SO4 (98%). The resulting mixture was heated within an oven at 100 -C for 6 h and next 160 -C for another 6 h. As a way to obtain completely polymerized sucrose inside pores of the SBA-15 template, 5 mL aqueous solution containing 0.8 g (2.33 mmol) sucrose and 0.09 g (0.917 mmol) of H2SO4 were added again, and the mix was put through the thermal treatment defined above once more. Then, it had been carbonized under nitrogen gas movement at 900 -C for 6 h with a heating system level of 5 -C min-1. Finally, the resulting sound was washed with 1 M NaOH option (50 vol. % ethanol-50 vol. % H2O) twice to remove the silica template, filtered, washed with ethanol until pH = 7, and dried at 100 -C for 4 h.

Micro/Mesoporous Carbon Materials for Hazardous Water Purification.

SEM image of ordered mesoporous SBA-15 template, HRTEM images of the formed carbon nanotubes, XRD pattern and photograph of the g-C3N4/OMC–CNT catalyst, and TEM images of the g-C3N4/OMC–CNT catalyst which were taken from different regions. ()

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