纳米片
电容去离子
超级电容器
材料科学
碳化
纳米技术
电容
聚丙烯腈
化学工程
碳纳米纤维
石墨烯
纳米纤维
电化学
扫描电子显微镜
化学
碳纳米管
复合材料
电极
工程类
聚合物
物理化学
作者
Jingjing Li,Bin Hu,Pengfei Nie,Xiaohong Shang,Wenwen Jiang,Kaibing Xu,Jianmao Yang,Jianyun Liu
标识
DOI:10.1016/j.apsusc.2020.148715
摘要
Birnessite-type MnO2 (δ-MnO2) nanosheet assembly with various structures were achieved by redox reaction of KMnO4 under acidic condition with Fe regulation on Fe-doping carbon nanofibers (Fe-CNFs). The Fe-CNFs with various Fe contents were conveniently obtained by carbonization of the electrospun ferric acetylacetonate-polyacrylonitrile (AAI-PAN) fiber with various AAI ratios. X-ray diffraction and transmission electron microscopy demonstrated the formation of δ-MnO2 on the Fe-CNFs. pHs of KMnO4 solution and Fe content in the fiber affected the morphology of δ-MnO2. At pH = 2, the uniform δ-MnO2 nanosheet assembly was transferred into a tubular structure by adjusting Fe content in the Fe-CNFs template (AAI = 5%, mass ratio). The obtained δ-MnO2@Fe-CNF-5% exhibited the highest aspect ratio, large surface area and best charge-transfer behavior. The δ-MnO2@Fe-CNF-5% electrode delivered a specific capacitance of 210 F/g (0.3 A/g) and a superior cycling stability with 94% capacitance retention in 4500 cycles. The δ-MnO2@Fe-CNF-5%, as a negative electrode presented an excellent performance both in supercapacitor with high energy density (20 Wh/kg) and in capacitive deionization cell with the salt adsorption capacity of 20 mg/g. The unique nanostructure and excellent electrochemical performance render the δ-MnO2@Fe-CNF-5% composite as a much promising material for charge storage and deionization applications.
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