Low energy consumption flow capacitive deionization with a combination of redox couples and carbon slurry

Wei, Qiang; Hu, Yudi; Wang, Jian; Ru, Qiang; Hou, Xianhua; Zhao, Lingzhi; Yu, Denis Y. W.; Hui, Kwan San; Yan, Dongliang; Hui, Kwun Nam; Chen, Fuming

doi:10.1016/j.carbon.2020.07.044

Cited by 40 publications

(24 citation statements)

References 24 publications

(24 reference statements)

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“…In this regard, capacitive deionization (CDI), an advanced electrochemical deionization technology, has emerged as a competitive methodology for the desalination of brackish water and seawater, due to its several important advantages including low energy consumption, cost effectiveness, and environmental benignity. [5][6][7][8][9] The working principle of CDI is similar to that of electric double layer (EDL) capacitors, 10 where the application of a low directional current causes charged ions to approach the oppositely charged electrode, with their subsequent adsorption at internal pores by formation of EDLs. This process eventually provides puried water with extracted ions being continuously stored within the electrode materials.…”

Section: Introductionmentioning

confidence: 99%

Graphene–carbon 2D heterostructures with hierarchically-porous P,N-doped layered architecture for capacitive deionization

et al. 2021

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Section: Introductionmentioning

confidence: 99%

Graphene–carbon 2D heterostructures with hierarchically-porous P,N-doped layered architecture for capacitive deionization

et al. 2021

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“…The FCDI setup here is similar to the previous reported work, − as demonstrated in Figure . The carbon flow chambers were made of acrylic plates (130 mm × 130 mm × 2 mm) with a snake flow path (7 cm length, 2 mm width and 2 mm depth).…”

Section: Methodsmentioning

confidence: 53%

Enhanced Desalination Performance of a Flow-Electrode Capacitive Deionization System by Adding Vanadium Redox Couples and Carbon Nanotubes

Wang

Wei

et al. 2021

J. Phys. Chem. C

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Flow-electrode capacitive deionization (FCDI) technology can achieve continuous desalination via the electrodialysis coupling method. However, electrical energy is still highly consumed. In this work, the flow carbon nanotubes (CNTs) and vanadium redox couples are utilized as the flow electrode material together with AC to achieve the energy-saving desalination process. The V 2+ /V 3+ ions are oxidized/reduced at the positive/negative electrode chambers under the constant current applied. The ions in salt feed can be continuously removed through the electrodialysis process in a three-membrane configuration (AEM|CEM|AEM). The carbon nanotubes play double roles of both electron transporter and capacitive ion capturer together with activated carbon. Excellent electrochemical desalination can be obtained. In the current sample tests, the desalination rate can be up to 0.253 μg cm −2 s −1 , and the energy consumption of 72.62 kJ mol −1 is achievable by adding 1 wt % CNTs and 20 mM/20 mM V 2+ / V 3+ to 6.41 wt % activated carbon flow electrode at the current density 0.43 mA cm −2 . This demonstrates the possibility of low-energy desalination with the continuous process. Our study provides an efficient way to promote the FCDI desalination performance, which will contribute to the development of FCDI technology in the future.

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“…Upon optimization of PEDOT electrodes grown with different cycles, the electrocatalytic activity is enhanced. Since the PEDOT increased the capacitive behavior, the electrochemically active surface reaction induces the redox reaction of the [Fe(CN 6 )] 3/4– species ,− (Figure S2a). The electrocatalytic activity is gradually increased for the PEDOT samples prepared at 5, 10, and 15 cycles.…”

Section: Results and Discussionmentioning

confidence: 99%

Efficient PEDOT Electrode Architecture for Continuous Redox-Flow Desalination

Karthick

Zhu

Wang

et al. 2021

ACS Sustainable Chem. Eng.

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Both low-energy consumption and high salt removal rate are highly required in the electrochemical desalination. In this work, a conducting polymer poly(3,4-ethylene-dioxythiophene), i.e., PEDOT, is electrochemically decorated on a graphite foil as an electrode material of redox-flow desalination (RFD). At a current density of 2 mA•cm −2 , the energy consumption of the RFD is reduced to 38.1 kJ•mol −1 with PEDOT-modified electrodes, compared with 154.5 kJ•mol −1 using a bare graphite electrode. Meanwhile, the salt removal rate is enhanced to 1.54 μmol•cm −2 •min −1 using the PEDOT electrode from 1.11 μmol•cm −2 •min −1 in the bare graphite electrode. The PEDOT electrodes can also provide excellent cycling stability. The improved performance may be due to the promising conductivity and porous structure of PEDOT, which would supply more active sites between the electrode and the redox electrolyte. The current research provides an electrochemical desalination strategy with low energy consumption and high salt removal rate, which is significant for the development of RFD technology.

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Low energy consumption flow capacitive deionization with a combination of redox couples and carbon slurry

Cited by 40 publications

References 24 publications

Graphene–carbon 2D heterostructures with hierarchically-porous P,N-doped layered architecture for capacitive deionization

Graphene–carbon 2D heterostructures with hierarchically-porous P,N-doped layered architecture for capacitive deionization

Enhanced Desalination Performance of a Flow-Electrode Capacitive Deionization System by Adding Vanadium Redox Couples and Carbon Nanotubes

Efficient PEDOT Electrode Architecture for Continuous Redox-Flow Desalination

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