Electrosorption capacitance of nanostructured carbon aerogel obtained by cyclic voltammetry

Yang, Kun‐Lin; Yiacoumi, Sotira; Tsouris, Costas

doi:10.1016/s0022-0728(02)01308-6

Cited by 120 publications

(72 citation statements)

References 26 publications

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“…On the other hand, the calculated specific EDL capacitances for 5, 10, 20 mV/s are 74.23, 64.25, and 58.33 F/g at -0.4 V, respectively. The explanation is that, at low scan rate, micropores have more contribution to provide the electrode/electrolyte interface for EDL formation (Yang et al 2003).…”

Section: Porous Structurementioning

confidence: 99%

“…The cutoff width decreased with increasing the solution concentration, and then smaller pores can contribute to electrosorption. A further understanding of the overlapping effect on capacitive behavior of carbon electrodes was carried out using voltammetric technology (Yang et al 2003;Hou et al 2006). EDL overlapping reduces the double layer capacitance in terms of the number of ions electroadsorbed within carbon electrodes.…”

Section: Introductionmentioning

confidence: 99%

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Application of capacitive deionization technology to the removal of sodium chloride from aqueous solutions

Hou

Huang

2013

Int. J. Environ. Sci. Technol.

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Capacitive deionization has been developed as a promising desalination alternative for removing ions from aqueous solutions. In this study, the evaluation of capacitive performance was carried out by galvanostatic charge/discharge and cyclic voltammetry experiments. The good capacitive and electrosorption behaviors suggest carbon aerogel not only treated as an electrical double layer capacitor, but also as a potential electrode in capacitive deionization processes. Also, the capacitive deionization characteristics indicate that electrosorption/regeneration can be controlled by polarization and depolarization of each electrode. It implies that sodium and chloride ions are electrostatically held to form electrical double layer on the surface of charged electrodes. The electrosorption performance at different applied voltages and solution concentrations was investigated. It is found that the removal of sodium chloride increases with increasing applied voltage and solution concentration, resulting from stronger electrostatic interactions, higher concentration gradient, and less double layer overlapping effect. Based on Langmuir isotherm, the equilibrium electrosorption capacity at 1.2 V is determined as 270.59 lmol/g. Under this condition, due to the presence of micropores associated with the double layer overlapping, the effective surface area for electrosorption of ions at 1.2 V is estimated in the range of 12.18-14.25 % of the BrunauerEmmett-Teller surface area. The results provide a fundamental understanding of electrosorption of ions and help promoting capacitive deionization technology for water purification and desalination.

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Section: Porous Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Application of capacitive deionization technology to the removal of sodium chloride from aqueous solutions

Hou

Huang

2013

Int. J. Environ. Sci. Technol.

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“…The dependence of capacitance on potential sweep rate has reported by Yang et al [8]. A study has shown that electrolyte concentration, applied voltage, and pore size distribution (PSD) may affect the value of the capacitance [8].…”

Section: -2mentioning

confidence: 93%

“…A study has shown that electrolyte concentration, applied voltage, and pore size distribution (PSD) may affect the value of the capacitance [8]. Fig.…”

Section: -2mentioning

confidence: 99%

Carbon electrode for desalination purpose in capacitive deionization

Endarko¹,

Fadilah²,

Anggoro

2016

AIP Conference Proceedings

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Performance analysis of carbon electrode synthesized with poly (vinyl alcohol) and citric acid as cross-linking agent for desalination of NaCl solution in capacitive deionization AIP Conference Proceedings 1788, 030107 (2017) Abstract. Carbon electrodes for desalination purpose have been successfully synthesized using activated carbon powder (BET surface area = 700 -1400 m 2 /g), carbon black and polyvinyl alcohol (PVA) binder by cross-linking method with glutaric acid (GA) at 120 C. The electrochemical properties of the carbon electrodes were analyzed using electrical impedance spectroscopy (EIS) and cyclic voltammetry (CV) whilst the physical properties were observed with scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM/EDX). In order to assess the desalting performance, salt removal experiments were performed by constructing a capacitive deionization unit cell with five pairs of carbon electrodes. For each pair consisted of two parallel carbon electrodes separated by a spacer. Desalination and regeneration processes were also observed in the salt-removal experiments. The salt-removal experiments were carried out in single-pass mode using a solution with 0.1 M NaCl at a flow rate of 10 mL/min. A voltage of 3 V was applied to the cell for 60 minutes for both processes in desalination and regeneration. The result showed that the percentage value of the salt-removal was achieved at 20%.

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“…On the other hand, the capacitance of ACF-5 was probably reduced as a result of steric factors, since this capacitance had almost the same value as that of ACF-3. Two reasons may be advanced for this observation: (i) a slight faradic current peak only occurs with ACF-5 which, as a result, only exhibits a pseudo-capacitance; (ii) it has been reported previously that it is difficult to generate sufficient capacitance in dilute aqueous solutions (Yang et al 2003). Since the electrolyte employed was a 1 mol/ᐉ aqueous solution of NH 4 Cl, the ions were completely diffuse in the solution and no difference in capacitance arose from this source.…”

Section: Ion-exchange Reactionmentioning

confidence: 97%

Elucidation of the Adsorption/Desorption Mechanism of Ions by an Electrical Double Layer Capacitor

Oda

Mizutaki

Yamamoto

et al. 2008

Adsorption Science & Technology

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ABSTRACT:The phenomena associated with the adsorption/desorption of ammonium, nitrate and phosphate ions by an electrical double layer capacitor (EDLC) were examined as a new application of this device for the removal of environmental pollutants from freshwater rivers, lakes and marshes.An electrode modified by introducing acidic functional groups onto its surface was used as the negative electrode of an EDLC, and this resulted in a 1.7-times increase in the amount of ammonium ions removed compared with that of an unmodified electrode. However, when the quantity of functional groups was increased to over 1.5 mmol/g, the amount of ammonium ions removed gradually decreased due to steric hindrance of the functional groups on the surface of the electrode and/or redox reactions with these groups.Similarly, it was found that the EDLC easily adsorbed nitrate ions but did not easily desorb them, whereas the opposite was the case for phosphate ions. The relationship between these phenomena and the pH pzc (pH value at the point of zero charge) of the electrode in nitrate and phosphate solutions is presented.

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Electrosorption capacitance of nanostructured carbon aerogel obtained by cyclic voltammetry

Cited by 120 publications

References 26 publications

Application of capacitive deionization technology to the removal of sodium chloride from aqueous solutions

Application of capacitive deionization technology to the removal of sodium chloride from aqueous solutions

Carbon electrode for desalination purpose in capacitive deionization

Elucidation of the Adsorption/Desorption Mechanism of Ions by an Electrical Double Layer Capacitor

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