期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 574, 期 -, 页码 152-161出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2020.04.032
关键词
Capacitive deionization; Thermodynamic analysis; Intercalation materials; Energy efficiency
资金
- National Science Foundation (NSF) [1739884]
- Oak Ridge Associated Universities (ORAU) through the Ralph E. Powe Jr.
- Faculty Enhancement Award
Conventional capacitive deionization (CDI) with carbon electrodes is a desalination process based on the formation of electrical double layer. Intercalation capacitive deionization (ICDI), a category of CDI based on intercalation materials as electrodes, achieves desalination by inserting ions into the crystal lattice of the electrode when a voltage is applied. It has been proven numerically that a thermodynamically reversible CDI cycle always consumes electrical work that equals the Gibbs free energy of the separation. We conducted a thermodynamic analysis of a four-stage reversible cycle for both symmetric and asymmetric ICDI using Frumkin isotherm to describe the electrode-solution chemical equilibrium. We provided both analytical and numerical proof showing the electrical work to complete a four-stage ICDI cycle is exactly identical to the Gibbs free energy of separation. Our thermodynamic analysis also shows ICDI is typically more energy efficient than CDI if constant voltage charging and discharge are performed to complete the same separation. (C) 2020 Elsevier Inc. All rights reserved.
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