棒状V3O7?H2O电极材料的制备及印刷超级电容器

Fabrication of rod-like V3O7?H2O electrode material and printing of supercapacitors

摘要:

以五氧化二钒（V2O5）为原料，利用溶剂热法一步制备一水合七氧化三钒（V3O7?H2O）纳米棒，以V3O7?H2O纳米棒为电极材料，探究丝网印刷工艺对电极电化学性能的影响，结合丝网印刷制备电极并组装超级电容器。采用SEM、EDS、XPS、FTIR等对样品的形貌与结构进行表征，结果表明已成功制备V3O7?H2O纳米棒。在电化学测试中，丝网印刷电极比电容可达268.0 F/g（电流密度为0.3 A/g），经过5000次循环后比电容保持率85.9%，优于涂抹电极的比电容（246.0 F/g）和比电容保持率（68.0%），这得益于丝网印刷的油墨规则排列的结构。此外，组装的纽扣超级电容器同样表现出优异的电化学性能，比电容和电容保持率为134.2 F/g（0.5 A/g电流密度）和91.2%（5000次充放电循环），且当功率密度为413.0 W/kg时，能量密度最高可达22.0 W?h/kg。本研究为后续印刷储能器件的研究提供了一条可供借鉴的思路。

Abstract:

Vanadic oxide (V2O5) served as the raw material, and the vanadium trioxide (V3O7?H2O) nanorod is prepared via a one-step solvothermal method. The V3O7?H2O nanorods are used as electrode materials to explore the influence of screen-printing technology on the electrochemical performance of electrodes. Then, screen-printing technology is used to prepare electrodes, followed by the assembling of the coin supercapacitor. The results of morphology and structure characterized by SEM, EDS, XPS and FT-IR find that V3O7?H2O nanorods have been successfully synthesized. In the electrochemical performance test, the specific capacitance of the screen-printed electrode can reach 268.0 F/g (the current density is 0.3 A/g), and the specific capacitance retention is still 85.9% after 5000 charge/discharge cycles, which is superior to the smear electrode specific capacity (246.0 F/g) and specific capacitance retention (68.0%). The reason can be attributed to the regular arrangement of ink structure of screen printing. Moreover, the coin supercapacitors can exhibit excellent electrochemical performance with specific capacitance and capacitance retention of 134.2 F/g (0.5 A/g current density) and 91.2% (after 5000 charge/discharge cycles). When the power density is 413.0 W/kg, the energy density is as high as 22.0 W h/kg. In this study, which can provide a reference for further research of printed energy storage devices.