Na2FeP2O7 as a Novel Material for Hybrid Capacitive Deionization

Kim, Seonghwan; Lee, Jaehan; Kim, Choonsoo

doi:10.1016/j.electacta.2016.04.056

Cited by 213 publications

(141 citation statements)

References 47 publications

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“…Lastly, we note that the CC operation possesses other advantages over CV apart from lower energy consumption, such as producing constant and adjustable effluent concentrations, [9,10,32,33] and limiting charging time spent at substantial oxidizing potentials. [8] Therefore, we advocate the use of CC mode over CV for CDI cell operations to achieve lower energy consumption as well as produce controllable desalted effluent.…”

Section: Discussionmentioning

confidence: 98%

Energy consumption analysis of constant voltage and constant current operations in capacitive deionization

Campbell

et al. 2016

Desalination

126

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We report our studies to compare energy consumption of a CDI cell in constant voltage (CV) and constant current (CC) operations, with a focus on understanding the underlying physics of consumption patterns. The comparison is conducted under conditions that the CV and CC operations result in the same amounts of input charge and within identical charging phase durations. We present two electrical circuit models to simulate energy consumption in charging phase: one is a simple RC circuit model, and the other a transmission line circuit model. We built and tested a CDI cell to validate the transmission line model, and performed a series of experiments to compare CV versus CC operation under the condition of equal applied charge and charging duration. The experiments show that CC mode consumes energy at 33.8 kJ per mole of ions removed, which is only 28% of CV mode energy consumption (120.6 kJ/mole), but achieves similar level of salt removals. Together, the models and experiment support our major conclusion that CC is more energy efficient than CV for equal charge and charging duration. The models also suggest that the lower energy consumption of CC in charging is due to its lower resistive dissipation.

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Section: Discussionmentioning

confidence: 98%

Energy consumption analysis of constant voltage and constant current operations in capacitive deionization

Campbell

et al. 2016

Desalination

126

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“…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. In both of these desalination devices a single cation-intercalating electrode was paired with a different electrode that adsorbs anions, that has either economic (due to costly Ag electrodes [3]) or capacity (due to the EDL adsorption mechanism [2]) limitations.…”

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confidence: 99%

Nickel Hexacyanoferrate Electrodes for Continuous Cation Intercalation Desalination of Brackish Water

Porada

Shrivastava

Bukowska³

et al. 2017

Electrochimica Acta

231

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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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“…Instead of storing charge in the electrical double layer at the surface of the electrode, the battery electrodes can store charge in their bulk through chemical bonds, showing desalination capacities (approximately 60 mg g −1 ) much higher than obtained with CDI (approximately 20 mg g −1 ). Furthermore, hybrid capacitive deionization (HCDI), which is generally based on a capacitive electrode and a battery electrode, was also demonstrated, and exhibited desalination capacity superior to CDI …”

Section: Figurementioning

confidence: 99%

“…A saltwater‐based supercapacitor, battery, or a hybrid supercapacitor/battery system has not yet been reported. In addition, most of the reported CDI, HCDI, and desalination battery systems cannot output serviceable electric energy during regeneration of the electrode, but actually consume electric energy. For example, Nam et al .…”

Section: Figurementioning

confidence: 99%

Integrating Desalination and Energy Storage using a Saltwater‐based Hybrid Sodium‐ion Supercapacitor

Guo

Dong

et al. 2018

ChemSusChem

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Ever-increasing freshwater scarcity and energy crisis problems require efficient seawater desalination and energy storage technologies; however, each target is generally considered separately. Herein, a hybrid sodium-ion supercapacitor, involving a carbon-coated nano-NaTi (PO ) -based battery anode and an activated-carbon-based capacitive cathode, is developed to combine desalination and energy storage in one device. On charge, the supercapacitor removes salt in a flowing saltwater electrolyte through Cl electrochemical adsorption at the cathode and Na intercalation at the anode. Discharge delivers useful electric energy and regenerates the electrodes. This supercapacitor can be used not only for energy storage with promising electrochemical performance (i.e., high power, high efficiency, and long cycle life), but also as a desalination device with desalination capacity of 146.8 mg g , much higher than most reported capacitive and battery desalination devices. Finally, we demonstrate renewables to usable electric energy and desalted water through combining commercial photovoltaics and this hybrid supercapacitor.

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Na2FeP2O7 as a Novel Material for Hybrid Capacitive Deionization

Cited by 213 publications

References 47 publications

Energy consumption analysis of constant voltage and constant current operations in capacitive deionization

Energy consumption analysis of constant voltage and constant current operations in capacitive deionization

Nickel Hexacyanoferrate Electrodes for Continuous Cation Intercalation Desalination of Brackish Water

Integrating Desalination and Energy Storage using a Saltwater‐based Hybrid Sodium‐ion Supercapacitor

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