Abstract:

In recent years, more and more research has been devoted to the development of new electrode materials with ultra-high energy density and high Faraday reaction activity, especially applying them to a new generation of supercapacitor energy storage systems. In this study, sea urchin-shaped V₂O₅ nanospheres and tetrakaidecahedron Fe₂O₃ nano boxes have been grown directly on flexible matrix carbon cloth by hydrothermal method. The hydrothermal time can control the microstructure of V₂O₅, and the morphology determines the performance of energy storage, the positive electrode material of sea urchin-shaped V₂O₅ nanosphere exhibits a maximum specific capacitance of 535 F·g^-1. In addition, the tetrakaidecahedron Fe₂O₃ nano box is used as the negative electrode, and a new structure V₂O₅//Fe₂O₃ flexible supercapacitor is assembled. When the power density is 699.49 W·kg^-1, the energy density can reach 46.06 W·h·kg^-1. Moreover, it also has good mechanical flexibility, and the specific capacity retention rate is still as high as 83.4% after 5000 times of 180° bending cycle tests. This work provides a general and effective strategy for developing the next generation flexible electronic devices with ultra-high energy density.

Key words: electrochemistry, nanomaterials, hydrothermal, supercapacitors, vanadium pentoxide, ferric oxide

摘要：

近年来，越来越多的研究致力于开发新型、超高能量密度、高法拉第反应活性的电极材料，尤其将其应用于新一代超级电容器储能系统。通过水热法直接在柔性基质碳布上生长海胆状V₂O₅纳米球和十四面体Fe₂O₃纳米盒子。V₂O₅微观结构和储能性能可通过改变水热时间进行调控。海胆状V₂O₅纳米球正极材料具有最高比容量535 F·g^-1。以十四面体Fe₂O₃纳米盒子作为负极材料组装的新型结构V₂O₅-CC//Fe₂O₃-CC柔性超级电容器，在功率密度为699.49 W·kg^-1时，能量密度可达46.06 W·h·kg^-1。而且具有良好的机械柔韧性，在180°弯曲循环测试5000次，比容量保持率仍高达83.4%。研究为开发下一代超高能量密度、柔性电子器件提供了一种通用而有效的策略。

关键词: 电化学, 纳米材料, 水热, 超级电容器, 五氧化二钒, 三氧化二铁