摘要
电容去离子脱盐(CDI)是一种去除水中盐离子的有效方法,具有能耗低、无二次污染等众多技术优势。采用高温固相法合成硼碳氮纳米片材料,其具有比表面积高、电化学稳定性良好等特点,通过与石墨烯材料的共价交联,制备了具有高脱盐量、优异循环稳定性的硼碳氮纳米片/石墨烯复合CDI电极。此结构中,硼碳氮纳米片的高比表面积为盐离子提供了丰富的吸附位点,其优异的电化学稳定性提高了CDI循环性能;石墨烯材料为复合电极构建了电子传输网络,提高了复合电极的导电性。将其与活性炭负极组装成非对称CDI模块,在3200 mg L-1的盐浓度、1.4 V电压下,脱盐量达到了20.16 mg g-1;在1.0 V电压下,经30圈循环,容量保持率达到88.1%。
Capacitive deionization(CDI) is an effective method for removing ions from saline water. It has many technical advantages such as low energy consumption and no secondary pollution. The properties of electrode materials are the key factors that determine CDI performance. The boron nitride-carbon nanosheets were synthesized by a high-temperature solid-state method and had a high specific surface area and good electrochemical stability. A boron nitride-carbon nanosheet/graphene composite with high desalination ability and excellent cycling stability was prepared by covalent cross-linking. In this composite, boron nitride-carbon nanosheets provide abundant adsorption sites for Na+ ions, and the excellent electrochemical stability improves the CDI cycle performance while the graphene forms an electronic conduction network, which increases the conductivity of the composite electrode. An asymmetric CDI cell using the composite as the anode and activated carbon as the cathode exhibits an excellent salt adsorption capacity of 20.16 mg g-1 at a supplied voltage of 1.4 V when the feeding NaCl concentration is 3 200 mg L-1. After the cell has been cycled 30 times with an initial NaCl concentration of 3 200 mg L-1 at a supply voltage of 1.0 V, its capacity is 88.1% of the initial value.
作者
王刚
张云启
汪仕勇
王建韧
李天竹
邱介山
WANG Gang;ZHANG Yun-qi;WANG Shi-yong;WANG Jian-ren;LI Tian-zhu;QIU Jie-shan(School of Environment and Civil Engineering,Dongguan University of Technology,Dongguan 523106,China;State Key Lab of Fine Chemicals,School of Chemical Engineering,Dalian University of Technology,Dalian 116024,China;College of Resources and Environment,Northeast Agricultural University,Harbin 150030,China)
出处
《新型炭材料》
SCIE
EI
CAS
CSCD
北大核心
2020年第4期384-393,共10页
New Carbon Materials
基金
国家自然科学基金(21878049),东莞市引进创新创业领军人才计划资助.
关键词
非对称电容去离子
硼碳氮纳米片/石墨烯
二维材料
共价交联
Asymmetric capacitive deionization
Boron-nitride-carbon nanosheets/graphene
Two-dimensional materials
Covalent cross-linking
