电容去离子
吸附
阳极
材料科学
电极
化学工程
电池(电)
活性炭
热解
碳纤维
比表面积
电化学
无机化学
化学
复合材料
有机化学
催化作用
物理化学
工程类
功率(物理)
物理
复合数
量子力学
作者
Cuijiao Zhao,Guoqiang Liu,Na Sun,Xian Zhang,Guozhong Wang,Yunxia Zhang,Haimin Zhang,Chen Chen
标识
DOI:10.1016/j.cej.2017.11.069
摘要
Capacitive deionization (CDI) has been a promising technique to obtain fresh water by electrosorption of charged ionic species in seawater/brackish water. Its performance is highly dependent on the physical and chemical properties of CDI electrode materials. Herein, N-doped porous carbon (NPC) with a N content of 1.66 at.% was fabricated using soybean shell as starting material by a facile pyrolysis approach with the assistance of KHCO3 in N2 atmosphere. The as-prepared NPC with porous structure and high surface area (1036.2 m2 g−1) was further functionalized with sulfonic groups in an aryl diazonium salt solution to obtain sulfonyl functionalized NPC (S-NPC) with a surface area of 844.0 m2 g−1. S-NPC as cathode material was assembled into an asymmetric CDI device with aminated activated carbon (A-AC) as anode material, exhibiting superior CDI performance with an adsorption capacity of 15.5 mg g−1 and an average adsorption rate of 0.44 mg g−1 min−1 in 40 mg L−1 NaCl solution at an applied voltage of 1.2 V. As a proof of concept study, such configured CDI device was also powered for the first time by a Zn-air battery made from NPC with an open-circuit voltage of 1.28 V owing to N doping in soybean shell derived porous carbon with superior oxygen reduction reaction (ORR) activity, delivering an impressive CDI performance with an adsorption capacity of 15.8 mg g−1 and an average adsorption rate of 0.37 mg g−1 min−1 in 40 mg L−1 NaCl solution. This superior CDI performance can be due to S-NPC with high surface area, porous structure and surface rich negative charges resulted from sulfonyl functionalization, favourable for adsorption active sites exposure and mass transport of Na+ ions.
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