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Title: High-performance ion removal via zinc–air desalination
Authors: Srimuk, P.Wang, L.Budak, Ö.Presser, V.
Publishers Version:
Issue Date: 2020
Published in: Electrochemistry Communications Vol. 115 (2020)
Publisher: Amsterdam : Elsevier
Abstract: Electrochemical processes enable a new generation of energy-efficient desalination technologies. While ion electrosorption via capacitive deionization is only suitable for brackish water with low molar strength, the use of Faradaic materials capable of reversible ion intercalation or conversion reactions allows energy-efficient removal of ions from seawater. However, the limited charge transfer/storage capacity of Faradaic materials indicates an upper limit for their desalination applications. Therefore, a new electrochemical concept must be explored to exceed the current state-of-the-art results and to push the desalination capacity beyond 100–200 mgNaCl/gelectrode. In this proof-of-concept work, we introduce the new concept of using metal–air battery technology for desalination. We do so by presenting performance data for zinc–air desalination (ZAD) in 600 mM NaCl. The ZAD cell provides a desalination capacity of 0.9–1.0 mgNaCl/cm2 (normalized to the membrane area; corresponding to 1300 mgNaCl/gZn) with a charge efficiency of 70% when charging/discharging the cell at 1 mA/cm2. The energy consumption of ZAD is 68–92 kJ/mol.
Keywords: Capacitive deionization; Oxygen evolution reaction; Oxygen reduction reaction; Water desalination; Zinc-air battery; Charge transfer; Energy efficiency; Energy utilization; Ions; Sodium chloride; Zinc; Battery technology; Capacitive deionization; Charge efficiency; Charging/discharging; Conversion reactions; Desalination technologies; Electrochemical process; Ion intercalation; Desalination
DDC: 540
License: CC BY 4.0 Unported
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