Synthesis of MnO₂ nanowires by hydrothermal method and their electrochemical characteristics

In this work, we developed a synthetic method for preparing one-dimensional MnO₂nanowires through a hydrothermal method using a mixture of KMnO₄and MnSO₄precursors. As-prepared MnO₂nanowires had a high surface area and porous structure, which are beneficial to the fast electron and ion transfer during electrochemical reaction. The microstructure and chemical structure of MnO₂nanowires were characterized by scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and Brunauer-Emmett-Teller measurements. The electrochemical properties of MnO₂nanowire electrodes were also investigated using cyclic voltammetry and galvanostatic charge-discharge with a three-electrode system. MnO₂nanowire electrodes showed a high specific capacitance of 129 F/g, a high rate capability of 61% retention, and an excellent cycle life of 100% during 1000 cycles.