A Scalable Free‐Standing V2O5/CNT Film Electrode for Supercapacitors with a Wide Operation Voltage (1.6 V) in an Aqueous Electrolyte |
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| Authors: | Jiabin Wu Xiang Gao Huimin Yu Tianpeng Ding Yixin Yan Bin Yao Xu Yao Dongchang Chen Meilin Liu Liang Huang |
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| Affiliation: | 1. Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, P.R. China;2. Department of Electrical Engineering, The Pennsylvania State University, University Park, PA, USA;3. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, USA |
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| Abstract: | While vanadium oxides have many attractive pseudocapacitive features for energy storage, their applications are severely limited by the poor electronic conductivity and low specific surface area. To overcome these limitations, a scalable, free‐standing film electrode composed of intertwined V2O5 nanowires and carbon nanotubes (CNTs) using a blade coating process has been prepared. The unique architecture of this hybrid electrode greatly facilitates electronic transport along CNTs while maintaining rapid ion diffusion within V2O5 nanowires and fast electron transfer across the V2O5/CNTs interfaces. When tested in a neutral aqueous electrolyte, this hybrid film electrode demonstrates a volumetric capacitance of ≈460 F cm?3. Moreover, a symmetric capacitor based on two identical film electrodes displays a wide operation voltage window of 1.6 V, delivering a volumetric energy density as high as 41 Wh L?1. |
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| Keywords: | carbon nanotube conductivity scalable supercapacitors vanadium pentoxide |
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