Please use this identifier to cite or link to this item: doi:10.22028/D291-33195
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Title: Antimony alloying electrode for high-performance sodium removal: how to use a battery material not stable in aqueous media for saline water remediation
Author(s): Arnold, Stefanie
Wang, Lei
Budak, Öznil
Aslan, Mesut
Srimuk, Pattarachai
Presser, Volker
Language: English
Title: Journal of materials chemistry
Volume: 9
Issue: 1
Startpage: 585
Endpage: 596
Publisher/Platform: RSC
Year of Publication: 2021
Publikation type: Journal Article
Abstract: Capacitive deionization (CDI) is based on ion electrosorption and has emerged as a promising desalination technology, for example, to obtain drinking water from brackish water. As a next-generation technology, battery desalination uses faradaic processes and, thereby, enables higher desalination capacities and remediation of feed water with high molar strength such as seawater. However, the full use of a large capacity of charge transfer processes is limited by the voltage window of water and the need to use electrode materials non-reactive towards the water. Using our multi-channel bi-electrolyte cell, we now introduce for the first time an alloying electrode for sodium removal in the context of water desalination. Separated by a ceramic sodium superionic conductor (NASICON) membrane, the antimony/carbon composite electrode accomplished sodium removal while chlorine removal is enabled via ion electrosorption with nanoporous carbon (activated carbon cloth). In a sodium-ion battery half-cell setup, the antimony/carbon composite electrode reaches an initial capacity of 714 mA h g−1 at a specific current of 200 mA g−1, which shows a slow but continuous degrading over the course of 80 cycles (426 mA h g−1 in 80th cycle). Our hybrid CDI cell provides a desalination capacity of an average of 294 mgNa gSb−1 (748 mgNaCl gSb−1) with a charge efficiency of ca. 74% in a 600 mM NaCl at a specific current of 200 mA g−1 and a voltage range of −2.0 V to +2.0 V.
DOI of the first publication: 10.1039/D0TA09806J
URL of the first publication:
Link to this record: hdl:20.500.11880/30548
ISSN: 2050-7496
Date of registration: 4-Feb-2021
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Chemie
NT - Materialwissenschaft und Werkstofftechnik
Professorship: NT - Prof. Dr. Volker Presser
Collections:Die Universitätsbibliographie

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