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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• 作者：Jiabin Wu ; Xiang Gao ; Huimin Yu ; Tianpeng Ding ; Yixin Yan ; Bin Yao ; Xu Yao ; Dongchang Chen ; Meilin Liu and Liang Huang
• 刊名：Advanced Functional Materials
• 出版年：2016
• 出版时间：September 6, 2016
• 年：2016
• 卷：26
• 期：33
• 页码：6114-6120
• 全文大小：1154K
• ISSN：1616-3028

文摘

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.