Surface modification and energy storage properties of multi-walled carbon nanotubes
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摘要: 采用體積比為3∶1的濃硫酸和濃硝酸混合溶液對多壁碳納米管進行表面氧化改性,利用場發射掃描電鏡(FE-SEM)、比表面分析儀(BET)以及X射線光電子能譜(XPS)等手段分析了酸處理前后多壁碳納米管的形貌、比表面積和表面官能團,利用循環伏安測試和充放電測試分析了酸處理前后多壁碳納米管的電化學性能.結果表明,通過酸氧化改性,多壁碳納米管的管長變短,比表面積增加,表面含氮和含氧官能團增加,從而導致其電化學性能大幅度地提高,在1 mol·L-1的硫酸電解液中比電容從7 F·g-1增加到66 F·g-1.Abstract: The modification of multi-walled carbon nanotubes(MWCNTs) was carried out with a mixed acid of concentrated sulfuric acid and nitric acid at a volume ratio of 3:1.The morphology,specific surface area and surface functional groups of the resulting MWCNTs were analyzed by field emission scanning electron microscopy(FE-SEM),surface area analysis and X-ray photoelectron spectroscopy(XPS),respectively.The electrochemical properties of the MWCNTs were studied by cyclic voltammetry and galvanostatic charge-discharge tests.The results indicate that after oxidation by acid,the lengths of the MWCNTs are shortened,and the specific surface area is enlarged and the contents of surface nitrogen-and oxygen-containing functional groups increase.This leads to the enhancement of electrochemical properties of the MWCNTs,and the specific capacitance of MWCNTs can increase from 7 F·g-1 to 66 F·g-1.
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Key words:
- supercapacitors /
- carbon nanotubes /
- surface treatment /
- modification /
- energy storage /
- functional groups
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