Conditions and features of matrix and bulk carbonization of the organic precursors

Lysenko, N. D.; Yaremov, P. S.; Ilyin, Vladimir G.; Ovcharova, Mariya V.

doi:10.1007/s10853-011-5339-5

Cited by 7 publications

(3 citation statements)

References 15 publications

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“…To judge the ability of CMK-3 to adsorb ions from electrolyte, the nitrogen adsorption–desorption isotherms for CMK-3 were recorded (Figure d). These are type-IV isotherms, which are typical of CMK-3, and the clear hysteresis plot at relative pressures in the range of ∼0.4–0.8 suggests that CMK-3 is a mesoporous material. , The specific surface area is 898 m 2 g –1 . The pore volume is 1.25 cm 3 g –1 , and the mesopore size is 2.38 nm (Figure d′).…”

Section: Results and Discussionmentioning

confidence: 91%

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Efficient Energy Storage by an Asymmetric Poly(3,4-propylenedioxythiophene)//CMK-3 Supercapacitor

Deshagani

Das

Nepak

et al. 2020

ACS Appl. Polym. Mater.

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Poly(3,4-propylenedioxythiophene) (PProDOT) and ordered mesoporous carbon (CMK-3) as positive and negative electrodes are assembled into an asymmetric supercapacitor (ASC), along with a gel electrolyte containing an ionic lqiuid, for the very first time. The advantages of PProDOT include charge storage by a Faradaic reaction, large electrical conductivity of 11 mS cm–1 in the doped state, robust microstructure that can endure long-term cycling, and ease of scale-up in the form of a thin coating. CMK-3 has the advantage of a porous meso-channelled morphology that enables rapid propagation of electrolyte ions with an effective surface area of 898 m2 g–1, maximizing electrical double layer formation, and a conductivity of ∼12 mS cm–1, which results in a wide operational voltage range of 2 V, an areal specific capacitance (SC) of 294 mF cm–2, an energy density of 0.16 to 0.11 mWh cm–2 at a power density of 0.86 to 3.98 mW cm–2, slow self-discharge rate, low leakage current, and a 98% SC retention after 5000 cycles for the PProDOT//CMK-3 ASC. The enhanced magnitudes of the performance metrics of the PProDOT//CMK-3 ASC in comparison to the inferior performance parameters for the symmetric counterparts (i.e., PProDOT//PProDOT and CMK-3//CMK-3) illustrate the benefits of an asymmetric cell architecture over a symmetric one. Demonstrations of powering a green LED and a digital thermometer with 3-ASCs connected in series show the utilitarian value of this device, for it is not only composed of nontoxic and low-cost components but also can be scaled up easily for the realization of large area supercapacitor devices.

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Section: Results and Discussionmentioning

confidence: 91%

“…These are type-IV isotherms, which are typical of CMK-3, and the clear hysteresis plot at relative pressures in the range of ∼0.4−0.8 suggests that CMK-3 is a mesoporous material. 29,30 The specific surface area is 898 m 2 g −1 . The pore volume is 1.25 cm 3 g −1 , and the mesopore size is 2.38 nm (Figure 3d′).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Efficient Energy Storage by an Asymmetric Poly(3,4-propylenedioxythiophene)//CMK-3 Supercapacitor

Deshagani

Das

Nepak

et al. 2020

ACS Appl. Polym. Mater.

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“…24 The graphitic nature of the CMK-3 surface has been confirmed via Raman spectroscopy and is primarily composed of carbon atoms in an sp 2 hybrid state with a reduced quantity of disordered bonding. 24,25 Therefore, we assume that the surface interactions between the LC and the CMK-3 and between the LC and graphite could be similar. However, the stronger ring current of the aromatic carbons 26 in graphite, which are much less disordered than those of CMK-3, results in a highly dispersed 11 B NMR spectra (Figure 5d).…”

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confidence: 99%

In Situ NMR Study on the Interaction between LiBH₄–Ca(BH₄)₂ and Mesoporous Scaffolds

Lee

Hwang

Kim

et al. 2012

J. Phys. Chem. Lett.

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We discuss the use of nuclear magnetic resonance (NMR) spectroscopy to investigate the physical state of the eutectic composition of LiBH 4 −Ca(BH 4 ) 2 (LC) infiltrated into mesoporous scaffolds and the interface effect of various scaffolds. Eutectic melting and the melt infiltration of mixed borohydrides were observed through in situ NMR. In situ and ex situ NMR results for LC mixed with mesoporous scaffolds indicate that LiBH 4 and Ca(BH 4 ) 2 exist as an amorphous mixture inside of the pores after infiltration. Surprisingly, the confinement of the eutectic LC mixture within the mesopores is initiated below the melting temperature, which indicates a certain interaction between the borohydrides and the mesoporous scaffolds. The confined borohydrides remain inside of the pores after cooling. These phenomena were not observed in microporous or nonporous materials, and this observation highlights the importance of the pore structure of the scaffolds. Such surface interactions may be associated with a faster dehydrogenation of the nanoconfined borohydrides. SECTION: Energy Conversion and Storage; Energy and Charge Transport

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Efficient adsorption of pharmaceutical drugs from aqueous solution using a mesoporous activated carbon

2019

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The removal of widely used pharmaceuticals by new granular mesoporous activated carbon materials prepared via a simple one-step pyrolysis process was studied. The series of mesoporous carbons (MC) were derived from sucrose/polystyrene using two mesoporous matrices: MCM-48 and SBA-15 sieves. Two different activation schemes were used to obtained samples: steam-pyrolysis at 900 °C, and chemical modification (with HNO3, H2O2 and their mixture) at 200 °C. The studied conditions of chemical oxidation led to significant structural alterations. Compared to the activated carbon treated by steam at 900 °C, the treatment via chemical oxidation increased the total volume of pores from 1.09 to 2.73 cm 3 g -1 . The total adsorption capacity towards tetracycline was found to be proportional to the mesoporous volume and the amount of surface O-containing groups. From the experimental adsorption isotherms, the maximum adsorption capacity was calculated 909.2 mg•g −1 for tetracycline at pH = 7. The kinetics of adsorption fits the pseudo-second order model perfectly. The adsorption data treated by both Langmuir and Freundlich models indicates that the adsorption was monomolecular. This research provides insight into the adsorption behavior of antibiotics on non-activated and activated mesoporous carbonous materials and facilitates their application to removal of pharmaceuticals from contaminated aqueous solutions. The potential adsorption mechanism of mesoporous carbons for the adsorption of antibiotics was proposed. The granular mesoporous carbon after oxidation by mixture of HNO3 and H2O2 with ration 1:1 exhibited much higher adsorptive activity and still showed relatively high adsorption stability even after five cycles, which were potentially suitable for easy separation and high efficiency.

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Conditions and features of matrix and bulk carbonization of the organic precursors

Cited by 7 publications

References 15 publications

Efficient Energy Storage by an Asymmetric Poly(3,4-propylenedioxythiophene)//CMK-3 Supercapacitor

Efficient Energy Storage by an Asymmetric Poly(3,4-propylenedioxythiophene)//CMK-3 Supercapacitor

In Situ NMR Study on the Interaction between LiBH₄–Ca(BH₄)₂ and Mesoporous Scaffolds

Efficient adsorption of pharmaceutical drugs from aqueous solution using a mesoporous activated carbon

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Conditions and features of matrix and bulk carbonization of the organic precursors

Cited by 7 publications

References 15 publications

Efficient Energy Storage by an Asymmetric Poly(3,4-propylenedioxythiophene)//CMK-3 Supercapacitor

Efficient Energy Storage by an Asymmetric Poly(3,4-propylenedioxythiophene)//CMK-3 Supercapacitor

In Situ NMR Study on the Interaction between LiBH4–Ca(BH4)2 and Mesoporous Scaffolds

Efficient adsorption of pharmaceutical drugs from aqueous solution using a mesoporous activated carbon

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In Situ NMR Study on the Interaction between LiBH₄–Ca(BH₄)₂ and Mesoporous Scaffolds