1. Design of nitrogen-doped cluster-like porous carbons with hierarchical hollow nanoarchitecture and their enhanced performance in capacitive deionization
- Author
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Lianjun Wang, Jiaming Shen, Jiansheng Li, Weiqing Han, Xiuyun Sun, Yang Li, Junwen Qi, Jinyou Shen, and Yuxin Liu
- Subjects
Materials science ,Carbonization ,Capacitive deionization ,Mechanical Engineering ,General Chemical Engineering ,Diffusion ,Composite number ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Desalination ,0104 chemical sciences ,Chemical engineering ,Electrode ,General Materials Science ,Wetting ,0210 nano-technology ,Porosity ,Water Science and Technology - Abstract
The electrode material with high electrosorption capacity and fast electrosorption rate is highly desired in capacitive deionization (CDI) process. To meet this demand, the nitrogen-doped cluster-like porous carbons (NCPCs) with hierarchical hollow nanoarchitecture were rationally prepared by carbonizing the polydopamine/nano-ZnO composite and employed as CDI electrodes. The resultant NCPCs possess an interconnected hierarchical structure with a hollow cavity, nitrogen-doping property, high specific surface, large pore volume and good wettability. All these merits can ensure a huge accessible electrosorption interface for the very quick diffusion of ions so that achieve an excellent CDI performance. Particularly, the sample carbonized at 900 °C (NCPC-900) with the optimal porous structure and chemistry composition exhibits the highest electrosorption capacity of 11.98 mg g− 1 in 100 mg L− 1 NaCl solution. Besides, the NCPC-900 electrode shows a good cycle stability over 20 electrosorption-desorption cycles. These results render that the NCPCs have the great potential as the electrode material for high performance CDI desalination.
- Published
- 2018