Electrochemical selective ion separation in capacitive deionization with sodium manganese oxide

Kim, Seonghwan; Yoon, Hansun; Shin, Dongyoon; Lee, Jaehan; Yoon, Jeyong

doi:10.1016/j.jcis.2017.07.054

Cited by 110 publications

(70 citation statements)

References 25 publications

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“…This is because from a rather low to a rather high charge, the change in electrode potential with electrode charge is much lower with IHCs than with carbons, i.e., the differential capacitance of IHCs (a number with unit F/g) can be much higher than for EDL formation in carbons at the same charge as IHCs. Also, IHCs have the potential to selectively remove one ion out of a multi-ion mixture with other ions of the same valence and charge [10,11]. Anode Anodic reaction: Na 2 NiFe (II) (CN) 6 NaNiFe (III) (CN) 6 +Na + + e -Cathodic reaction: NaNiFe (III) (CN) 6 The use of IHCs for water desalination has been reported previously using several novel cell architectures.…”

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confidence: 99%

“…Anode Anodic reaction: Na 2 NiFe (II) (CN) 6 NaNiFe (III) (CN) 6 +Na + + e -Cathodic reaction: NaNiFe (III) (CN) 6 The use of IHCs for water desalination has been reported previously using several novel cell architectures. The "Desalination Battery" (DB), a cell consisting of one Na 2 Mn 5 O 10 (NMO) electrode (and later with Na 0.44 MnO 2 [11]) and one Ag/AgCl electrode (and recently with BiOCl [12,13]), was used for water desalination by adsorption of cations within NMO and adsorption of Clions by conversion of Ag to AgCl [3]. In "Hybrid CDI" (HCDI) [2], an IHC electrode (e.g., with NMO [2], Na 2 FeP 2 O 7 [14], MoS 2 [15], or NaFe 2 (CN) 6 [16]) was combined with a carbon electrode for anion adsorption.…”

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confidence: 99%

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Nickel Hexacyanoferrate Electrodes for Continuous Cation Intercalation Desalination of Brackish Water

Porada

Shrivastava

Bukowska³

et al. 2017

Electrochimica Acta

252

234

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Using porous electrodes containing redox-active nickel hexacyanoferrate (NiHCF) nanoparticles, we construct and test a device for capacitive deionization in a two flow-channel device where the intercalation electrodes are in direct contact with an anion-exchange membrane. Upon reduction of NiHCF, cations intercalate into it and the water in its vicinity is desalinated; at the same time water in the opposing electrode becomes more saline upon oxidation of NiHCF in that electrode. In a cyclic process of charge and discharge, fresh water is continuously produced, alternating between the two channels in sync with the direction of applied current. We present proof-of-principle experiments of this technology for single salt solutions, where we analyze various levels of current and cycle durations. We analyze salt removal rate and energy consumption. In desalination experiments with salt mixtures we find a threefold enhancement for K + over Na + -adsorption, which shows the potential of NiHCF intercalation electrodes for selective ion separation from mixed ionic solutions.

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confidence: 99%

mentioning

confidence: 99%

Nickel Hexacyanoferrate Electrodes for Continuous Cation Intercalation Desalination of Brackish Water

Porada

Shrivastava

Bukowska³

et al. 2017

Electrochimica Acta

252

234

View full text Add to dashboard Cite

show abstract

“…Many researchers have developed CDI desalination systems in terms of theories, electrode materials, and various cell configurations [17][18][19][20][21][22][23][24][25][26][27][28]. Furthermore, in principle, not only sodium chloride but also various kinds of charged ions can be extracted [29][30][31]. However, CDI has inevitable drawbacks coming from its working mechanism.…”

Section: Introductionmentioning

confidence: 99%

Continuous Lithium Extraction from Aqueous Solution Using Flow-Electrode Capacitive Deionization

Jung

Lim

et al. 2019

Energies

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Flow-electrode-based capacitive deionization (FCDI) is a desalination process that uses electrostatic adsorption and desorption of ions onto electrode materials. It provides a continuous desalination flow with high salt removal performance and low energy consumption. Since lithium has been regarded as an essential element for the last few decades, the efficient production of lithium from the natural environment has been intensively investigated. In this study, we have extracted lithium ions from aqueous solution by using FCDI desalination. We confirmed that lithium and chloride ions could be continuously collected and that the salt removal rate depends on various parameters, including feed-flow rate and a feed saline concentration. We found that the salt removal rate increases as the feed-flow rate decreases and the feed salt concentration increases. Furthermore, the salt removal rate depends on the circulation mode of the feed solution (continuous feed stream vs. batch feed stream), which allows control of the desalination performance (higher capacity vs. higher efficiency) depending on the purpose of the application. The salt removal rate was highest, at 215.06 µmol/m −2 s −1 , at the feed rate of 3 mL/min and the feed concentration of 100 mg/L. We believe that such efficient and continuous extraction of lithium chloride using FCDI desalination can open a new door for the current lithium-production industry, which typically uses natural water evaporation.

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“…It originates from the nature of ion insertion or intercalation, which is strongly dependent on the material's crystal structure. The crystallographic site at which ion uptake occurs is dependent on the type and size of ion involved . Second, separating cations and anions or monovalent and divalent cations can also be accomplished by using an ion‐selective membrane during electrodialysis .…”

Section: Introductionmentioning

confidence: 99%

Potential‐Dependent, Switchable Ion Selectivity in Aqueous Media Using Titanium Disulfide

et al. 2018

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The selective removal of ions by an electrochemical process is a promising approach to enable various water-treatment applications such as water softening or heavy-metal removal. Ion intercalation materials have been investigated for their intrinsic ability to prefer one specific ion over others, showing a preference for (small) monovalent ions over multivalent species. In this work, we present a fundamentally different approach: tunable ion selectivity not by modifying the electrode material, but by changing the operational voltage. We used titanium disulfide, which shows distinctly different potentials for the intercalation of different cations and formed binder-free composite electrodes with carbon nanotubes. Capitalizing on this potential difference, we demonstrated controllable cation selectivity by online monitoring the effluent stream during electrochemical operation by inductively coupled plasma optical emission spectrometry of aqueous 50 mm CsCl and MgCl . We obtained a molar selectivity of Mg over Cs of 31 (strong Mg preference) in the potential range between -396 mV and -220 mV versus Ag/AgCl. By adjusting the operational potential window from -219 mV to +26 mV versus Ag/AgCl, Cs was preferred over Mg by 1.7 times (Cs preference).

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Electrochemical selective ion separation in capacitive deionization with sodium manganese oxide

Cited by 110 publications

References 25 publications

Nickel Hexacyanoferrate Electrodes for Continuous Cation Intercalation Desalination of Brackish Water

Nickel Hexacyanoferrate Electrodes for Continuous Cation Intercalation Desalination of Brackish Water

Continuous Lithium Extraction from Aqueous Solution Using Flow-Electrode Capacitive Deionization

Potential‐Dependent, Switchable Ion Selectivity in Aqueous Media Using Titanium Disulfide

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