Enhanced Capacitive Deionization by Dispersion of CNTs in Activated Carbon Electrode

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Energy-effective, ecofriendly desalination is a technology in universal demand due to global water scarcity. Capacitive deionization (CDI) is a promising method that has those advantages, but it is still necessary to enhance desalination performance to desalinate high-concentration raw salt water. In this work, carbon nanotubes (CNTs) are used as a conductive agent of the CDI electrode. To use CNTs as a conductive agent, we examine the effect of the dispersion status of the CNTs within activated carbon active material on the CDI performance. Acid treatment-functionalization of CNTs created a better dispersion status than CNTs without any treatment. Homogeneously dispersed CNTs showed enhanced electrochemical and desalination performance. Interestingly, desalination tests with highly concentrated raw salt water achieved a more notable improvement with 13.9% at only 1 wt % of CNT dispersion. The improvement mechanisms with dispersing CNTs such as increment of surface area and decrement of electrode resistivity are analyzed.
Publisher
ACS Publication
Issue Date
2018-02
Language
English
Article Type
Article
Keywords

REDUCED GRAPHENE OXIDE; PERFORMANCE; NANOTUBES; COMPOSITE; DESALINATION; HYBRID

Citation

ACS Sustainable Chemistry & Engineering, v.6, no.2, pp.1572 - 1579

ISSN
2168-0485
DOI
10.1021/acssuschemeng.7b01750
URI
http://hdl.handle.net/10203/240627
Appears in Collection
NE-Journal Papers(저널논문)MS-Journal Papers(저널논문)
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