Enhanced capacitive deionization performance of graphene/carbon nanotube composites

Zhang, Dengsong; Yan, Tingting; Shi, Liyi; Zheng, Peng; Wen, Xiaoru; Zhang, Jianping

doi:10.1039/c2jm31393f

Cited by 328 publications

(204 citation statements)

References 53 publications

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“…The electrosorption of the electrodes is higher at lower scan rates. It is because of the diffusion of ions from the solution to the electrode surface due to adsorption/desorption mechanism [9]. As the scan rate increases, the rectangular shape of the CV curves for the chemically treated samples became more slanting as shown in Fig.…”

Section: Cyclic Voltammetry Analysismentioning

confidence: 82%

“…The weight 'm' of 1 cm 2 electrode material is found to be 0.016 g. From Table 2, it was found that the specific capacitance value of the untreated sample increased from 49 F/g to 154 F/g due to the chemical treatment with 8 M HNO 3 for 9 h. The specific capacitance values obtained by CV experiments for the samples are found to depend on the sweep rates due to the time dependence of the ionic charging process [9,18].…”

Section: Cyclic Voltammetry Analysismentioning

confidence: 85%

“…This may be due to the higher electrosorption behavior of the samples because of the chemical treatment with nitric acid. However, the effective inner surface adsorption of ions was reduced at higher scan rates in all the samples as reported [9]. The difference in anodic (i a ) and cathodic (i c ) current was used to calculate the approximate specific capacitance in F (C Charge) value as indicated in equation (1).…”

Section: Cyclic Voltammetry Analysismentioning

confidence: 99%

“…Many other alternatives for carbon electrodes such as carbon nanotube composites [9] are being investigated for potential application in CDI. Activated carbon cloth (ACC) is one of the cost effective high surface area electrode material which finds commercial application in wastewater treatment [10].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Chemically Treated / Untreated Carbon Cloth: Potential Use as Electrode Materials in the Capacitive Deionization Process of Desalination of Aqueous Salt Solution

Thamilselvan

Nesaraj

Noel

et al. 2015

Journal of Electrochemical Science and Technology

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Capacitive deionization (CDI) process is a novel approach for desalination of an aqueous salt solution. In the present study, an activated carbon cloth (ACC) is proposed as effective electrode material. Initially the carbon cloth was activated in 1 M and 8 M HNO 3 for 9 hours at room temperature. The untreated and chemically activated carbon cloth (ACC) electrode materials were subjected to BET surface area measurements in order to get information about their specific surface area, average pore size, total pore volume and micropore area. The above materials were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM) also. The electrochemical studies for the electrodes were done using cyclic voltammetry (CV) in 0.1 M Na 2 SO 4 medium. From the studies, it was found that resistivity of the activated carbon cloth electrodes (treated in 1 M and 8 M HNO 3 ) was decreased significantly by the chemical oxidation in nitric acid at room temperature and its capacitance was found to be 90 F/g (1 M HNO 3 ) and 154 F/g (8 M HNO 3 ) respectively in 0.1 M Na 2 SO 4 solution. The capacitive deionization behavior of a single cell CDI with activated carbon cloth electrodes was also studied and reported in this work.

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Section: Cyclic Voltammetry Analysismentioning

confidence: 82%

Section: Cyclic Voltammetry Analysismentioning

confidence: 85%

Section: Cyclic Voltammetry Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Chemically Treated / Untreated Carbon Cloth: Potential Use as Electrode Materials in the Capacitive Deionization Process of Desalination of Aqueous Salt Solution

Thamilselvan

Nesaraj

Noel

et al. 2015

Journal of Electrochemical Science and Technology

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“…Graphene oxide-carbon nanotube (GO-CNT) composites have been the subject of significant research interest with studies aimed at characterising the enhanced electrical properties [11][12] [13] [14] of the composites or modelling the complex interaction between the two allotropes of carbon [15][16] [17]. It has been shown that graphene has a higher electroactive surface area than carbon nanotubes [13][18] [19].…”

Section: Introductionmentioning

confidence: 99%

Aqueous dispersions of reduced graphene oxide and multi wall carbon nanotubes for enhanced glucose oxidase bioelectrode performance

Grosse

Champavert

Gambhir

et al. 2013

Carbon

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(2013). Aqueous dispersions of reduced graphene oxide and multi wall carbon nanotubes for enhanced glucose oxidase bioelectrode performance. Carbon, 61 (September), 467-475. Aqueous dispersions of reduced graphene oxide and multi wall carbon nanotubes for enhanced glucose oxidase bioelectrode performance AbstractAqueous dispersions of reduced graphene oxide (rGO) and multi walled carbon nanotubes (MWCNT) were fabricated through a modified chemical reduction method. The significant advantage of the method developed here is the omission of any stabilising compound or organic solvent to obtain stable rGO-MWCNT dispersions. Significantly biological entities, in this case the enzyme glucose oxidase (GOx), can be successfully incorporated into the dispersion. These dispersions were characterised using XPS, SEM, zeta potential and particle size measurements which showed that the dispersion stability is not sacrificed with the addition of GOx, and significantly, the electrical properties of the rGO and MWCNTs are maintained. In this study, rGO acts as an effective dispersing agent for MWCNTs and does not affect the solubility or electroactivity of the GOx. Bioelectrodes fabricated from these rGO-MWCNT-GOx dispersions were characterised electrochemically to test their feasibility in facilitating direct electron transfer (DET) from the redox centre of the enzyme to the electrode. The DET results showed that the specific catalytic current generated at an optimised rGO-MWCNT-GOx electrode was 72 uA/ug which is 144 times more efficient than other literature values for similar systems. The remarkable specific catalytic current can be attributed to the use of purified enzyme, the efficiency of charge transfer within the rGO-MWCNT composite and the ability of the electrode to facilitate direct electron transfer. Abstract:Aqueous dispersions of reduced Graphene Oxide (rGO) and multi walled carbon nanotubes (MWCNT) were fabricated through a modified chemical reduction method. The significant advantage of the method developed here is the omission of any stabilizing compound or organic solvent to obtain stable rGO-MWCNT dispersions. Significantly biological entities, in this case the enzyme glucose oxidase (GOx), can be successfully incorporated into the dispersion. These dispersions were characterised using XPS, SEM, zeta potential and particle size measurements which showed that the dispersion stability is not sacrificed with the addition of GOx, and significantly, the electrical properties of the rGO and MWCNTs are maintained. In this study, rGO acts as an effective dispersing agent for MWCNTs and does not affect the solubility or electroactivity of the GOx.Bioelectrodes fabricated from these rGO-MWCNT-GOx dispersions were characterised electrochemically to test their feasibility in facilitating direct electron transfer (DET) from the redox centre of the enzyme to the electrode. The DET results showed that the specific catalytic current generated at an optimized rGO-MWCNT-GOx electrode was 72 µA/µg GOx, which is 144 times m...

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Electrosorption of Heavy Metals with Capacitive Deionization: Water Reuse, Desalination and Resources Recovery

Elson²,

Drewes

2014

Desalination

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Enhanced capacitive deionization performance of graphene/carbon nanotube composites

Cited by 328 publications

References 53 publications

Effect of Chemically Treated / Untreated Carbon Cloth: Potential Use as Electrode Materials in the Capacitive Deionization Process of Desalination of Aqueous Salt Solution

Effect of Chemically Treated / Untreated Carbon Cloth: Potential Use as Electrode Materials in the Capacitive Deionization Process of Desalination of Aqueous Salt Solution

Aqueous dispersions of reduced graphene oxide and multi wall carbon nanotubes for enhanced glucose oxidase bioelectrode performance

Electrosorption of Heavy Metals with Capacitive Deionization: Water Reuse, Desalination and Resources Recovery

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