Hydrothermal Synthesis and Electrochemical Properties of Spherical α-MnO2 for Supercapacitors

作者：Chen, Ya^*; Qin, Wenqing; Fan, Ruijuan; Wang, Jiawei; Chen, Baizhen

来源：Journal of Nanoscience and Nanotechnology, 2015, 15(12): 9760-9765.

DOI：10.1166/jnn.2015.10490

• Manganese Dioxide
• Electrode Material
• Supercapacitor
• Electrochemical Capacitor
• Hydrothermal Synthesis

In the present work, spherical alpha-MnO2 with a high specific capacitance was synthesized by a two-step hydrothermal route. MnCO3 precursors were first prepared by a common hydrothermal method, and then converted to alpha-MnO2 via a hydrothermal reaction between the precursors and KMnO4 solutions. The effects of hydrothermal temperature on the morphology, crystal structure and specific area of the MnO2 were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD) and BET measurements. The electrochemical capacitive properties of the manganese dioxides with different morphologies and structures were evaluated by cyclic voltarnimetry and galvonostatic charge-discharge tests. The results showed that the temperature in the second hydrothermal step had prominent impact on the capacitive properties of alpha-MnO2. The MnO2 synthesized at 150 degrees C exhibited a highest specific capacitance of 328.4 F.g(-1) at a charge-discharge current density of 100 mA.g(-1).

• 出版日期2015-12
• 单位中南大学