Study of carbon aerogel-activated carbon composite electrodes for capacitive deionization application

Kohli, Deepak; Singh, Rashmi; Singh, M. K.; Singh, Ashish; Khardekar, R. K.; Sankar, P. Ram; Tiwari, Pragya; Gupta, Pooja

doi:10.1080/19443994.2012.708210

Cited by 17 publications

(7 citation statements)

References 19 publications

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“…Even though OMC value of salt adsorption is high 10.56 mg/g [13], these are too expensive from a commercial point of view. Recent studies have been made on composite electrode to utilize the advantage of complimentary surface characteristics of high surface area and PSD for improving CDI performance [14,15].…”

Section: Introductionmentioning

confidence: 99%

Enhanced salt-adsorption capacity of ambient pressure dried carbon aerogel activated by CO2 for capacitive deionization application

Kohli

Singh

et al. 2015

Desalination and Water Treatment

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2014): Enhanced salt-adsorption capacity of ambient pressure dried carbon aerogel activated by CO 2 for capacitive deionization application , Desalination and Water Treatment, A B S T R A C TCarbon aerogels (CAs) were prepared by polycondensation of resorcinol and formaldehyde using ambient drying technique and were further activated by CO 2 . These were investigated for capacitive deionization (CDI) application. The gel parameters were optimized to obtain mesoporous CA with pore size distribution in 8-10 nm. The CA was further subjected to CO 2 activation at 950˚C for different time durations and its effect on surface properties was studied. The surface area of the activated CA increased from 698 to 2057 m 2 /g with corresponding increase in mesopore area from 289 to 644 m 2 /g. The pore volume also increased from 0.79 to 1.72 cm 3 /g. Cyclic voltammetry was performed on the test electrodes and specific capacitance values of 108 F/g was measured at scan rate of 10 mV/s in 1 M NaCl. Electrodes of size 200 × 200 mm were synthesized with an active material loading of~15 mg/cm 2 and their CDI performance was evaluated in batch mode experiment. Salt-adsorption capacity as high as 8.4 mg/g for CO 2 activated CA was achieved for the starting electrolyte concentration of 500 mg/L, whereas the adsorption capacity for the CA without activation was 4.1 mg/g. The results suggest that CO 2 activated CA is a good choice for CDI application.

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Section: Introductionmentioning

confidence: 99%

Enhanced salt-adsorption capacity of ambient pressure dried carbon aerogel activated by CO2 for capacitive deionization application

Kohli

Singh

et al. 2015

Desalination and Water Treatment

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“…The equilibrium electrosorption capacity (S, mg g -1 ) per mass of electrode was defined as following Eq. (2) [19]:…”

Section: Measurementmentioning

confidence: 99%

“…The charge efficiency, which is the ratio of the equilibrium salt adsorption to charge, does not depend much on the type of material, which indicates that materials that have been identified for high charge storage capacity can also be very suitable for CDI. For CDI, the most promising materials for electrodes are those which have a high specific surface area, a large number of subnanometric pores, good electrical conductivity and low cost [13][14][15][16][17][18][19]. Due to these properties, nanoporous carbons have attracted the attention of researchers around the world [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Application of Carbons Produced from Rice Husk in the Process of Capacitive Deionization

Павленко

Supiyeva

2020

Eurasian Chem. Tech. J.

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Nanoporous carbon materials are well recognized as the main components of electrodes in capacitive deionization. Herein, the activated carbons were produced based on rice husk which is an abundant waste material in southern regions of Kazakhstan. The resulting carbons were characterized electrochemically by comparing their performance with well-known brands of commercial porous carbons (i.e. Norit DLC Super 30, Kuraray YP 50F). The features of carbon/ carbon electrochemical cells were analyzed using the means of galvanostatic cycling with potential limitation and cyclic voltammetry. Whilst the surface morphology and elemental composition of carbons were observed using scanning electron microscopy combined with energy dispersive X-ray spectroscopy. Using the method of low-temperature nitrogen adsorption it has been established that the specific surface of home-made carbon produced based on rice husk is equal to 2290 m2g-1. The salt adsorption analysis has been performed using different concentrations of inlet solutions of sodium chloride. Our study has shown that the manufacturing and application of activated carbons based on rice husk can be highly efficient because the resulting electrode materials exhibit a high electrosorption capacity of 20.02 mg g-1, which exceeds similar values obtained in the case of application of commercial porous carbons.

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“…Variation of carbon to silica mass ratios were investigated and slight effect on performance of the CDI process was observed when adding the silica gel. Kohli et al [18] were also studied the electrodes synthesized using mesoporous carbon aerogel, microporous-activated carbon, and different combinations of the two for capacitive deionization application. The experiments data indicated composite electrodes showed fast absorption and desorption and higher salt removal efficiency.…”

Section: Trang 156mentioning

confidence: 99%

Capacitive deionization (CDI) for desalisation using carbon aerogel electrodes

Le¹,

Pham²,

Le³

2016

Sci. Tech. Dev. J.

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Capacitive deionization (CDI) is an electrochemical water treatment process that holds the promise of not only being a commercially viable alternative for treating water but for saving energy as well. Carbon aerogel electrodes for CDI process with high specific surface area (779.04 m2/g) and nano-pore (2-90 nm) have been prepared via pyrolyzing RF organic aerogel at 800oC in nitrogen atmosphere. The CDI characteristics of carbon aerogel electrodes were investigated for the NaCl absorption into a CDI cell at variation conditions. Experiments data showed that the maximum NaCl removal capacity was 21.41 mg/g in 500 mg/L NaCl solution, higher than for other carbon-based materials in the literature. It was evaluated that the CDI process using carbon aerogel electrodes promising to be an effective technology for desalination.

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Study of carbon aerogel-activated carbon composite electrodes for capacitive deionization application

Cited by 17 publications

References 19 publications

Enhanced salt-adsorption capacity of ambient pressure dried carbon aerogel activated by CO2 for capacitive deionization application

Enhanced salt-adsorption capacity of ambient pressure dried carbon aerogel activated by CO2 for capacitive deionization application

Application of Carbons Produced from Rice Husk in the Process of Capacitive Deionization

Capacitive deionization (CDI) for desalisation using carbon aerogel electrodes

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