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