High performance hybrid capacitive deionization with a Ag-coated activated carbon electrode

Yoon, Hai Jeon; Lee, Jiho; Min, Taijin; Lee, Gunhee; Oh, Minsub

doi:10.1039/d1ew00209k

Cited by 11 publications

(17 citation statements)

References 34 publications

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“…The Li + adsorption capacity increased because the electrochemical capacity of the AC electrode was improved through the electron transfer reaction between the Ag coating and Cl − (Ag + Cl − ⇄ AgCl + e − ). Similar trends were observed in previous studies, 25,26 where an increase in each electrode capacity (Q work , Q counter ) caused an increase in the overall electrochemical capacity (Q overall ) (1/Q overall = 1/Q work + 1/Q counter ). 24 Fig.…”

Section: Effect Of Ag-coated Ac Electrodesupporting

confidence: 90%

“…The electrodes were fabricated following our previously reported methods. 25,26,29,30 Active materials (AC (YP50, Kuraray Chemical Co, Japan) or spinel-type LMO (Sigma Aldrich, USA)), carbon black (Ketjenblack, Mitsubishi Chemical Corp., Japan), and polymeric binder (polytetrafluoroethylene (PTFE), Sigma Aldrich, USA) were mixed to prepare the electrode. The mixture was blended and roll-pressed to fabricate a sheet-type electrode.…”

Section: Electrode Preparationmentioning

confidence: 99%

“…Ag impregnation was performed by interfacing the AC electrode with the 100 mM AgNO 3 solution for 1 h under UV irradiation (TUV 8 W G8 T5, Philips, USA). 25,26 The AgNO 3 solution was prepared by dissolving commercially available AgNO 3 powder (Junsei Chemical, Japan) in deionized water. The pH of the AgNO 3 solution was approximately 6-7.…”

Section: Electrode Preparationmentioning

confidence: 99%

“…The electrode was then treated with NaOH solution and dried in a vacuum oven for 12 h. It is noted that the effects of different coating conditions on the loading mass and electrochemical performance of Ag were well investigated in our previous research. 25,26 The electrode surface was analyzed by scanning electron microscopy (SEM).…”

Section: Electrode Preparationmentioning

confidence: 99%

“…24 In our previous research, we proposed a strategy to reduce Ag utilization by coating a small amount of Ag on the AC electrode, which greatly enhanced the electrode's electrochemical performance and overcame the low capacity limitation. 25,26 Therefore, it is expected that the Ag-coated AC electrode may be a suitable counter electrode for an electrochemical-based Li recovery system.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Lithium-selective hybrid capacitive deionization system with a Ag-coated carbon electrode and stop-flow operation

Yoon

Min

Lee

et al. 2023

Environ. Sci.: Water Res. Technol.

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Section: Effect Of Ag-coated Ac Electrodesupporting

confidence: 90%

Section: Electrode Preparationmentioning

confidence: 99%

Section: Electrode Preparationmentioning

confidence: 99%

Section: Electrode Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Lithium-selective hybrid capacitive deionization system with a Ag-coated carbon electrode and stop-flow operation

Yoon

Min

Lee

et al. 2023

Environ. Sci.: Water Res. Technol.

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Electrocapacitive Deionization: Mechanisms, Electrodes, and Cell Designs

Sun

Tebyetekerwa

Wang

et al. 2023

Adv Funct Materials

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freshwater storage. [6,7] Figure 1 shows the annual average monthly blue water (fresh surface water and groundwater) scarcity.Regions like Australia, central America, North China, and North Africa face the highest freshwater scarcity. Two-thirds of the global population suffers from severe freshwater scarcity at least 1 month of the year, and half a billion people worldwide face severe freshwater scarcity all year around. [8] This issue will intensify in the future due to climate change and evergrowing water consumption.The earth's climate and the terrestrial water cycle have a close and complex relationship. [9] Climate change is causing parts of the water cycle to speed up as warming temperatures increase the water evaporation rate. Scientific evidence shows that global warming is now unequivocal. [10] Greenhouse gas emissions have steeply increased, directly affecting terrestrial water budgets. For example, water decreases have already been observed in western Africa, southwestern Australia, the Yellow River basin in China, and the Pacific Northwest of the United States of America. Such decreases affect freshwater availability directly. [8,11] In addition to the negative effects of climate change on freshwater access, the higher water consumption of our world population and economic activities are causing great additional freshwater stress. For example, agriculture consumes 50-60%, industries use 5-10%, and 10-20% is used for urban purposes. [12] Further, many of these activities may lead to polluted water, decreasing the available clean and freshwater. For these reasons, the United Nations declared freshwater as one of the many global challenges that need immediate action for sustainable development. [13] Depending on the total mass of dissolved solids in water, natural water is classified into brine water (>50 g L −1 ), saline water (30-50 g L −1 ), brackish water (0.5-30 g L −1 ), and freshwater (0-0.5 g L −1 ). [14] According to the World Health Organization, drinkable water should contain <0.25 g L −1 of salt, and the limitation on agriculture irrigation is 2 g L −1 . [15,16] There is a need to obtain freshwater by leveraging the tremendous amount of non-fresh water that can be made useable. This can be done by extracting undesirable ions from existing water in a desalination process. This process needs to be energy-efficient and cheap for sustainability and affordability. Water desalination is a promising and practical approach to maintaining an adequate potable water supply. [17,18] Capacitive deionization (CDI) is burgeoning as a cost-effective and energy-efficient

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MXene‐Based Capacitive Deionization–Strong Competitor Among Faradaic Electrode Systems: Current Status and Future Perspectives

Dubey

2023

ChemistrySelect

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Capacitive deionization (CDI) of brackish water is emerging as a sustainable and energy efficient desalination processes to mitigate the excessive demand of freshwater. Despite that the porous carbon is prime choice in the conventional CDI; its electrostatic interaction‐based limited salt adsorption capacity (SAC, up to 25 mg g−1) has driven the research interest to explore various Faradaic electrodes for attaining maximum SAC (>100 mg g−1) in supplementation with the other desalination metrics. MXene is one of the newly discovered intercalation‐type pseudocapacitive nanostructures, which promised an excellent desalination performance due to its intriguing properties, such as tuneable interlayer spacing, high electrical conductivity, hydrophilicity, and structural integrity. Furthermore, its compositing/heterostructuring with other electro‐active components significantly improves the desalination activity. This article provides a systematic overview of the MXene‐based electrodes utilized in CDI along with the one‐to‐one comparison with other Faradaic systems. Materials design, structure, cell architecture, desalination metrics‐based performance evaluation, and underlying driving forces behind the salty ions removal activity are the main emphasis of discussion to realize MXene‐based efficient CDI desalination. Lastly, the key issues and perspectives of MXene‐based electrode systems are put forward towards new developments and real time implication.

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High performance hybrid capacitive deionization with a Ag-coated activated carbon electrode

Abstract: Capacitive deionization (CDI) has been highlighted as a promising electrochemical water treatment system. However, the low deionization capacity of CDI electrodes has been a major limitation for its industrial application,...

Cited by 11 publications

References 34 publications

Lithium-selective hybrid capacitive deionization system with a Ag-coated carbon electrode and stop-flow operation

Lithium-selective hybrid capacitive deionization system with a Ag-coated carbon electrode and stop-flow operation

Electrocapacitive Deionization: Mechanisms, Electrodes, and Cell Designs

MXene‐Based Capacitive Deionization–Strong Competitor Among Faradaic Electrode Systems: Current Status and Future Perspectives

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