互通多孔碳/二氧化锰纳米复合材料的原位水热合成及电化学性能

doi:10.3866/PKU.WHXB201403061

Abstract

Abstract:

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 ℃ had the maximum specific capacitance, 411 F·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·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·g^-1 and a good rate capability was achieved.

Key words: Manganese oxide, Interconnected porous carbon, Supercapacitor, Composite electrode material

MSC2000:

O646

ZHANG Xuan-Xuan, RAN Fen, FAN Hui-Li, KONG Ling-Bin, KANG Long. Hydrothermal Synthesis and Electrochemical Measurements of Interconnected Porous Carbon/MnO₂ Composites[J].Acta Phys. -Chim. Sin., 2014, 30(5): 881-890.

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Hydrothermal Synthesis and Electrochemical Measurements of Interconnected Porous Carbon/MnO₂ Composites

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Hydrothermal Synthesis and Electrochemical Measurements of Interconnected Porous Carbon/MnO₂ Composites