电容去离子
材料科学
吸附
阳极
化学工程
介孔材料
碳纤维
比表面积
电化学
纳米技术
化学
电极
有机化学
复合材料
催化作用
复合数
工程类
物理化学
作者
Yanan Wang,Liuqian Yang,Dandan Ouyang,Dongxu Chen,Hui Zhu,Jiao Yin
标识
DOI:10.1016/j.jcis.2023.06.069
摘要
Porous carbons have attracted great attention in capacitive deionization (CDI), benefiting from their high surface areas and abundant adsorption sites. However, the sluggish adsorption rate and poor cycling stability of carbons are still concerns, which are caused by the insufficient ion-accessible networks and the side reactions (the co-ion repulsion and oxidative corrosion). Herein, inspired by the blood vessels in organisms, mesoporous hollow carbon fibers (HCF) were successfully synthesized via a template assisted coaxial electrospinning strategy. Subsequently, the surface charge state of HCFs were modified by various amino acids (arginine (HCF-Arg) and aspartic acid (HCF-Asp)). Combining the structure design and the surface modulation, these freestanding HCFs present enhanced desalination rate and stability, in which the hierarchal vasculature facilitates electron/ion transport, and the functionalized surface suppresses the side reactions. Impressively, when HCF-Asp and HCF-Arg serve as cathode and anode respectively, the asymmetric CDI device provides an excellent ion adsorption capacity of 45.6 mg g-1, a fast deionization rate of 14.0 mg g-1 min-1 and a superior cycling stability up to 80 cycles. In short, this work evidenced an integrated strategy to exploiting carbon materials with outstanding capacity and stability for high-performance capacitive deionization.
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