3D Channel-structured graphene as efficient electrodes for capacitive deionization

Document Type

Article

Publication Date

11-28-2018

Department

Department of Materials Science and Engineering

Abstract

Capacitive deionization (CDI), which is one of up-and-coming water treatment technologies, is based on ion electrostatic adsorption on electrode surface. Herein, three-dimensional channel-structured graphene (CSG), which was synthesized via exothermic reaction between liquid potassium and carbon monoxide gas, was demonstrated as an efficient electrode material for CDI. Namely, the CSG electrode exhibited a specific capacity of 207.4 F/g at 0.2 A/g in 1 M NaCl aqueous solution. In a batch-mode recycling system, the electrosorption capacity of CSG can achieve 5.70 and 9.60 mg/g at 1.5 V in 50 and 295 mg/l NaCl aqueous solutions, respectively. The excellent electrosorption capacity of CSG, especially under low saline concentration, can be attributed to the synergistic effect of its large surface area (711.9 m2/g), unique channel structure, and oxygen functional groups.

Publisher's Statement

Copyright 2018 Elsevier Inc. All rights reserved. Publisher's version of record: https://doi.org/10.1016/j.jcis.2018.11.105

Publication Title

Journal of Colloid and Interface Science

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