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Preparation of Y-doped ZrO2 coatings on MnO2 electrodes and their effect on electrochemical performance for MnO2 electrochemical supercapacitors

机译:MnO2电极对Y掺杂ZrO2涂层的制备及其对MnO2电化学超级电容器电化学性能的影响

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摘要

To enhance the cycling stability and conductivity of manganese dioxide (MnO2) electrodes for supercapacitors, yttrium (Y) doped zirconia (ZrO2) (denoted as Y/ZrO2) is coated on MnO2 supercapacitor electrodes (Y/ZrO2@MnO2 electrodes), so protecting the MnO2 electrodes in the electrolytes and enhancing the electrochemical performance of MnO2 electrodes in sodium sulfate electrolytes. The Y/ZrO2@MnO2 electrodes are characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX) and XRD analysis. The electrochemical properties of the electrodes are tested and analyzed by galvanostatic charge/discharge tests, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The Y/ZrO2@MnO2 electrodes achieve a specific capacity of 282.1 F g(-1) with a specific capacity loss of only 6.3% after 100 cycles at the current density of 50 mA g(-1). The results show that MnO2 particles are successfully deposited by Y-doped ZrO2 while the Y/ZrO2@MnO2 electrodes display better cycling stability and capacity performance. Therefore, this Y-doped ZrO2 coating is a potential choice to improve the cycling stability and conductivity of MnO2 electrodes.
机译:为了增强超级电容器二氧化锰(MnO2)电极的循环稳定性和电导率,涂覆在MnO2超级电容器电极(Y / ZrO2 @ MnO 2电极)上涂覆钇(Y)掺杂氧化锆(ZrO2)(表示为Y / ZrO2),因此保护电解质中的MnO2电极,增强硫酸钠电解质中MnO2电极的电化学性能。 Y / ZrO2 @ MnO2电极的特征在于扫描电子显微镜(SEM),透射电子显微镜(TEM),能量分散X射线光谱(EDX)和XRD分析。通过Galvanostatic电荷/放电试验,循环伏安法(CV)和电化学阻抗光谱(EIS)测试电极的电化学性能和分析。 Y / ZrO2 @ MnO2电极在电流密度为50mA g(-1)的电流密度之后,达到282.1fg(-1)的特定容量,其特定容量损耗仅为6.3%。结果表明,MNO2颗粒由Y掺杂ZrO2成功沉积,而Y / ZrO2 @ MnO2电极显示出更好的循环稳定性和容量性能。因此,这种Y掺杂的ZrO2涂层是改善MnO 2电极的循环稳定性和导电性的潜在选择。

著录项

  • 来源
    《RSC Advances》 |2016年第3期|共10页
  • 作者

    Zhang Yuqing; Zhai Yufeng;

  • 作者单位

    Tianjin Univ Sch Chem Engn &

    Technol Tianjin 300072 Peoples R China;

    Tianjin Univ Sch Chem Engn &

    Technol Tianjin 300072 Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

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