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- Title
Concentration-Gradient Multichannel Flow-Stream Membrane Capacitive Deionization Cell for High Desalination Capacity of Carbon Electrodes.
- Authors
Kim, Choonsoo; Lee, Juhan; Srimuk, Pattarachai; Aslan, Mesut; Presser, Volker
- Abstract
We present a novel multichannel membrane flow-stream capacitive deionization (MC-MCDI) concept with two flow streams to control the environment around the electrodes and a middle channel for water desalination. The introduction of side channels to our new cell design allows operation in a highly saline environment, while the feed water stream in the middle channel (conventional CDI channel) is separated from the electrodes with anion- and cation-exchange membranes. At a high salinity gradient between side (1000 mm) and middle (5 mm) channels, MC-MCDI exhibited an unprecedented saltadsorption capacity (SAC) of 56 mgg-1 in the middle channel with charge efficiency close to unity and low energy consumption. This excellent performance corresponds to a fourfold increase in desalination performance compared to the state-of-the-art in a conventional CDI cell. The enhancement originates from the enhanced specific capacitance in high-molar saline media in agreement with the Gouy-Chapman-Stern theory and from a double-ion desorption/adsorption process of MCMCDI through voltage operation from -1.2 to +1.2 V.
- Subjects
DEIONIZATION of water; SALINE water conversion; CARBON electrodes; TWO-phase flow; SALTS; ADSORPTION (Chemistry)
- Publication
ChemSusChem, 2017, Vol 10, Issue 24, p4914
- ISSN
1864-5631
- Publication type
Article
- DOI
10.1002/cssc.201700967