Hydrothermal Synthesis and Electrochemical Measurements of Interconnected Porous Carbon/MnO2 Composites
作者：Zhang Xuan-Xuan；Ran Fen；Fan Hui-Li；Kong Ling-Bin；Kang Long
關鍵字：Interconnected porous carbon；
論文來源：期刊
具體來源：ACTA PHYSICO-CHIMICA SINICA
發表時間：2014年
This article describes the electrochemical performance of a novel interconnected porous carbon/ MnO2 (IPC/MnO2) composite prepared by in situ self-limiting deposition under hydrothermal condition. The morphology and structure were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and thermogravimetric analysis (TGA), and the electrochemical behavior was investigated using cyclic voltammetry (CV), charge-discharge tests, electrochemical impedance spectroscopy (EIS), and cycle life tests. The results showed that MnO2 grew homogeneously on the IPC surface, forming a hierarchical microstructure. The MnO2 had a typical K-Birnessite-type crystal structure and the MnO2 content was about 34%(w). At high synthetic temperatures, the MnO2 particles on the IPC surface were smaller. The prepared electrode material exhibited a good electrochemical capacitance performance. As the reaction temperature increased, the specific capacitance of the IPC/MnO2 composite first increased and then remained constant. The IPC/MnO2 composite synthesized at 100 degrees C had the maximum specific capacitance, 411 F center dot g (-1), in a three-electrode system. An asymmetric supercapacitor was constructed with the IPC/MnO2 composite as the positive electrode and activated carbon (AC) as the negative electrode, in a 1 mol center dot L-1 Na2SO4 electrolyte. The results showed that the corresponding potential window increased from 1 to 1.8 V. The maximum specific capacitance of the asymmetric supercapacitor was 86 F center dot g(-1) and a good rate capability was achieved.