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A Redox-Shuttled Electrochemical Method for Energy-Efficient Separation of Salt from Water

We present a novel electrochemical method for separating salt from water in a practical, energy-efficient manner: SUPER (ShUttle-Promoted Electrolyte Removal). SUPER combines elements from redox flow batteries and conventional electrodialysis: a redox shuttle in a four-chambered cell architecture dr...

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Bibliographic Details
Published in:ACS sustainable chemistry & engineering 2019-08, Vol.7 (15), p.13411-13417
Main Authors: Beh, Eugene S, Benedict, Michael A, Desai, Divyaraj, Rivest, Jessy B
Format: Article
Language:English
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Summary:We present a novel electrochemical method for separating salt from water in a practical, energy-efficient manner: SUPER (ShUttle-Promoted Electrolyte Removal). SUPER combines elements from redox flow batteries and conventional electrodialysis: a redox shuttle in a four-chambered cell architecture drives ion motion at very low voltages and energy consumption without splitting water, uses no electrocatalysts, and can be salt-agnostic. As exemplified by NaCl, we demonstrate salt removal at a gravimetric specific energy consumption (SEC) as low as 0.046 kWh/kg NaCl transported, which is equivalent to producing water at drinkable salinity (
ISSN:2168-0485
2168-0485
DOI:10.1021/acssuschemeng.9b02720