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Issue 8, 2015
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Water desalination via capacitive deionization: what is it and what can we expect from it?

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Abstract

Capacitive deionization (CDI) is an emerging technology for the facile removal of charged ionic species from aqueous solutions, and is currently being widely explored for water desalination applications. The technology is based on ion electrosorption at the surface of a pair of electrically charged electrodes, commonly composed of highly porous carbon materials. The CDI community has grown exponentially over the past decade, driving tremendous advances via new cell architectures and system designs, the implementation of ion exchange membranes, and alternative concepts such as flowable carbon electrodes and hybrid systems employing a Faradaic (battery) electrode. Also, vast improvements have been made towards unraveling the complex processes inherent to interfacial electrochemistry, including the modelling of kinetic and equilibrium aspects of the desalination process. In our perspective, we critically review and evaluate the current state-of-the-art of CDI technology and provide definitions and performance metric nomenclature in an effort to unify the fast-growing CDI community. We also provide an outlook on the emerging trends in CDI and propose future research and development directions.

Graphical abstract: Water desalination via capacitive deionization: what is it and what can we expect from it?

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Article information


Submitted
14 Feb 2015
Accepted
05 May 2015
First published
05 May 2015

This article is Open Access

Energy Environ. Sci., 2015,8, 2296-2319
Article type
Perspective

Water desalination via capacitive deionization: what is it and what can we expect from it?

M. E. Suss, S. Porada, X. Sun, P. M. Biesheuvel, J. Yoon and V. Presser, Energy Environ. Sci., 2015, 8, 2296
DOI: 10.1039/C5EE00519A

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