Pseudocapacitive effect and Li+ diffusion coefficient in three-dimensionally ordered macroporous vanadium oxide for energy storage |
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Affiliation: | 1. College of Materials and Metallurgical Engineering, Guizhou Institute of Technology, Guiyang 550003, China;2. Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin 150001, China;3. School of Chemical Engineering and Technology, Harbin Institute of Technology, 150001 Harbin, China;4. College of Science, Guizhou Institute of Technology, Guiyang 550003, China |
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Abstract: | In order to act as extrinsic pseudocapacitor materials, nanoscale vanadium oxides are required to simultaneously exhibit a capacitance-based high power density and an intercalation-based high energy density. We have fabricated a three-dimensionally ordered macroporous (3DOM) structure with a wall thickness of 14 nm that fulfills the above requirements. The 3DOM vanadium oxide film exhibits high rate performance with 355 F g− 1 at 0.5 A g− 1 and 125 F g− 1 at 15 A g− 1. The enhanced pesudocapacitive effect and Li-ion diffusion coefficient based on the 3DOM nanostructure, also contributes to the high rate capability of vanadia, which can be confirmed by cyclic voltammetry and chronoamperometry. |
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