期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 224, 期 -, 页码 44-50出版社
ELSEVIER
DOI: 10.1016/j.seppur.2019.05.010
关键词
Capacitive deionization; Desalination; Nitrogen-doping; Hierarchical porous carbon aerogel
资金
- National Natural Science Foundation of China [21673070]
Capacitive deionization (CDI) has emerged as a promising energy-efficient, low cost technique for water treatment and desalination. Herein, we report a nitrogen-doped hierarchical porous carbon aerogel (N-HPCA) for high-performance CDI. The obtained N-HPCA possess a highly interconnected hierarchical porous structure, providing a large specific surface area of 2405 m(2) g(-1) and abundant mesopores ranging from 2 to 5 rim for the adsorption and efficient transport of ions. Meanwhile, N-doping largely enhances the conductivity and surface wettability of the carbon material. Consequently, the N-HPCA delivers a high specific capacitance (263 F g(-1) in 6 M KOH solution and 153 F g(-1) in 0.5 M NaCl solution), enabling an outstanding electrosorption capacity of 17.9 mg g(-1) in 500 mg L-1 NaCl solution. Moreover, the N-HPCA electrode also demonstrates good cycle stability, without obvious attenuation in electrosorption capacity upon 5 CDI cycles. These results demonstrate that the rationally designed N-HPCA shows great potential for practical CDI application.
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