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Optimization of the voltage window for long-term capacitive deionization stability.
- Source :
-
Desalination . Dec2017, Vol. 424, p53-61. 9p. - Publication Year :
- 2017
-
Abstract
- Capacitive deionization (CDI) is an energy efficient desalination technology. In this study, we conducted CDI experiments under different conditions and observed severe performance degradation from 7.3 to 0.5 mg/g after 70 cycles in symmetric 1.2/0 V operation because of anode oxidation under polarization. To eliminate the degradation, different charging and discharging voltages were tested in an asymmetric cell and 0.8/−0.4 V was selected as the optimized voltage window. Under the optimized voltage window, a capacity of 6.3 mg/g was obtained, only somewhat lower than that of the 1.2/0 V experiment, and the stability and charge efficiency were much higher by greatly mitigating the electrode corrosion. In addition, the process had a lower energy consumption. The stable performance in air- and oxygen-saturated conditions indicates that the optimized CDI has superior capacity and better performance than conventional CDI. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00119164
- Volume :
- 424
- Database :
- Academic Search Index
- Journal :
- Desalination
- Publication Type :
- Academic Journal
- Accession number :
- 125780939
- Full Text :
- https://doi.org/10.1016/j.desal.2017.09.026