A protic salt-derived porous carbon for efficient capacitive deionization: Balance between porous structure and chemical composition

作者：Li, Yang; Shen, Jiaming; Li, Jiansheng^*; Sun, Xiuyun; Shen, Jinyou; Han, Weiqing; Wang, Lianjun^*

来源：Carbon, 2017, 116: 21-32.

DOI：10.1016/j.carbon.2017.01.084

• NITROGEN-DOPED CARBON
• ORDERED MESOPOROUS CARBON
• REDUCED GRAPHENE OXIDE
• ACTIVATED CARBON
• ELECTRODE MATERIAL
• FUNCTIONAL-GROUPS
• NANOFIBER WEBS
• IONIC LIQUIDS
• 3D GRAPHENE
• PERFORMANCE

Capacitive deionization (CDI) with high energy efficiency, low cost, and non-secondary pollution is considered an emerging desalination technology. To pursue excellent electrode materials with high electrosorption capacity is highly desired for practical CDI application. In this work, the protic salt-derived porous carbon was synthesized via the direct pyrolysis of the protic salt, i.e., p-phenylenediamine bisulfate apPDA1[2HSO(4)]), which was obtained by simply neutralizing p-phenylenediamine with sulfuric acid. The resultant carbon materials possessed large specific surface area, high nitrogen doping, good graphitization and large mesopores. These intrinsic characteristics endowed protic salt-derived porous carbon with excellent electrochemical properties and CDI desalination performance. Particularly, the carbon obtained at 900 degrees C (C-9) with optimal porous structure (1082 m(2) g(-1)) and chemical composition (5.2% N) exhibited the best electrochemical property with a specific capacitance of 222.3 F g(-1). The CDI results showed that C-9 had a high electrosorption capacity of 16.5 mg g(-1) in 100 mg L-1 NaCI solution and excellent electrosorption stability over 20 times of adsorption-desorption cycles. Furthermore, we demonstrated the dependence of CDI performance on the balance between porous structure and chemical composition. These results imply that the protic salt-derived porous carbon should be a promising electrode material for CDI application.

• 出版日期2017-5
• 单位南京理工大学