2018
DOI: 10.1021/acs.jpcb.7b09168
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Charging and Transport Dynamics of a Flow-Through Electrode Capacitive Deionization System

Abstract: We present a study of the interplay among electric charging rate, capacitance, salt removal, and mass transport in "flow-through electrode" capacitive deionization (CDI) systems. We develop two models describing coupled transport and electro-adsorption/desorption which capture salt removal dynamics. The first model is a simplified, unsteady zero-dimensional volume-averaged model which identifies dimensionless parameters and figures of merits associated with cell performance. The second model is a higher fideli… Show more

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Cited by 41 publications
(21 citation statements)
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“…9,12,23 These performance metrics are defined quantitatively below for dynamic steady state (DSS) cycling but pertain to any operation mode (e.g., batch, flow-electrode, etc.). By controlling for the separation conditions, new materials, 24 device geometries, 20 electrode configurations, 25,26 and operation modes 19,27,28 can be objectively compared to one and other in terms of their energy consumption and volume throughput (see Section 2.1 and 2.2 for an example of such a comparison).…”
Section: Framework For Comparing Deionization Performancementioning
confidence: 99%
“…9,12,23 These performance metrics are defined quantitatively below for dynamic steady state (DSS) cycling but pertain to any operation mode (e.g., batch, flow-electrode, etc.). By controlling for the separation conditions, new materials, 24 device geometries, 20 electrode configurations, 25,26 and operation modes 19,27,28 can be objectively compared to one and other in terms of their energy consumption and volume throughput (see Section 2.1 and 2.2 for an example of such a comparison).…”
Section: Framework For Comparing Deionization Performancementioning
confidence: 99%
“…The reduction in separator layer thickness can enable higher desalination rates, greater reductions in feed concentration, and greater accessibility to the entire electrode surface for ion adsorption. [7][8][9] Unfortunately, one of the major drawbacks of FT systems is that they typically require greater feed pressures to sustain a throughput comparable to FB systems. 7,10 To address this issue, work has been directed towards the fabrication of hierarchical-structured electrodes possessing both large pores (0.1-200 mm diameter) to facilitate ī„„uid transport and small pores ($1 nm) to enhance surface area and ion adsorption capacity.…”
Section: Introductionmentioning
confidence: 99%
“…When a highly porous material with a large surface area is immersed in a liquid containing high concentration of ions, applying an external voltage (inducing an electric field between the solution and material) accelerates the adsorption of ions on the electrode surface [5,6]. Models are built to understand electroadsorption processes as well as ion transport through pores [7], thus generally leading to the prediction of ion adsorption and thereby assisting in improving the performance of electroadsorption devices.…”
Section: Introductionmentioning
confidence: 99%