Journal
CHEMICAL ENGINEERING JOURNAL
Volume 334, Issue -, Pages 1270-1280Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2017.11.069
Keywords
Soybean shell derived N-doped porous carbon; Sulfonyl functionalization; ORR activity; Zn-air battery; Capacitive deionization
Categories
Funding
- National Key R&D Program of China [2017YFA0207202]
- Natural Science Foundation of China [51672277, 51432009]
- CAS Pioneer Hundred Talents Program
- CAS/SAFEA International Partnership Program for Creative Research Teams of Chinese Academy of Sciences, China
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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 N-2 atmosphere. The as-prepared NPC with porous structure and high surface area (1036.2m(2) 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 844.0m(2) 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 opencircuit 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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