Atomic layer deposition of vanadium oxide on carbon nanotubes for high-power supercapacitor electrodes
Atomic layer deposition of vanadium oxide on carbon nanotubes for high-power supercapacitor electrodes
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DOI：
10.1039/c2ee21110f
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发表时间：
2012-05-01
影响因子：
32.5
通讯作者：
Yushin, Gleb
中科院分区：
文献类型：
--
作者：
Boukhalfa, Sofiane;Evanoff, Kara;Yushin, Gleb
钒氧化物可以提供高的赝电容，但有限的电导率和比表面积。原子层沉积允许在多壁碳纳米管（MWCNT）电极的表面上均匀沉积光滑的纳米结构的钒氧化物涂层，从而为形成用于超级电容器应用的无粘合剂柔性复合电极织物提供了一种新的途径，该织物具有大厚度、可控孔隙率、大大改善的导电性和循环稳定性。电化学测量显示所选MWCNT-钒氧化物电极的稳定性能和高达类似于1550 F g（-1）/活性质量的钒氧化物和高达类似于600 F g（-1）/质量的复合电极的显著电容，显著超过商业上使用的活性炭的比电容（100-150 F g（-1））。氧化物层的电化学性能被发现强烈依赖于涂层厚度。
Vanadium oxides may offer high pseudocapacitance but limited electrical conductivity and specific surface area. Atomic layer deposition allowed uniform deposition of smooth nanostructured vanadium oxide coatings on the surface of multi-walled carbon nanotube (MWCNT) electrodes, thus offering a novel route for the formation of binder-free flexible composite electrode fabric for supercapacitor applications with large thickness, controlled porosity, greatly improved electrical conductivity and cycle stability. Electrochemical measurements revealed stable performance of the selected MWCNT-vanadium oxide electrodes and remarkable capacitance of up to similar to 1550 F g(-1) per active mass of the vanadium oxide and up to similar to 600 F g(-1) per mass of the composite electrode, significantly exceeding specific capacitance of commercially used activated carbons (100-150 F g(-1)). Electrochemical performance of the oxide layers was found to strongly depend on the coating thickness.