Electrochemical properties of spinel-type manganese oxide/porous carbon nanocomposite powders in 1 M KOH aqueous solution

被引：6
作者：
Tsumura, Tomoki [1 ]
Tsumori, Koichiro [1 ]
Shimizu, Goichi [1 ]
Toyoda, Masahiro [1 ]
机构：
[1] Oita Univ, Fac Engn, Dept Appl Chem, Oita 8701192, Japan
来源：
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2012年 / 73卷 / 02期
关键词：
Inorganic compounds; Microporous materials; Electron diffraction; Electron microscopy; Electrochemical properties; CAPACITIVE CHARACTERISTICS; COMPOSITE ELECTRODE; CHEMICAL-SYNTHESIS; OXIDE-FILMS; MN3O4; MNO2; PERFORMANCE; DEPOSITION; BEHAVIOR;
D O I：
10.1016/j.jpcs.2011.10.036
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Spinel-type manganese oxide/porous carbon (Mn3O4/C) nanocomposite powders have been simply prepared by a thermal decomposition of manganese gluconate dihydrate under an Ar gas flow at above 600 degrees C. The structure and texture of the Mn3O4/C nanocomposite powders are investigated by X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS) equipped scanning transmission electron microscopy (STEM), transmission electron microscopy (TEM), selected area-electron diffraction (SA-ED), thermogravimetric and differential thermal analysis (TG-DTA) and adsorption/desorption of N-2 gas at 196 degrees C. The electrochemical properties of the nanocomposite powders in 1 M KOH aqueous solution are studied, focusing on the relationship between their structures and electrochemical capacitance. In the nanocomposite powders, Mn3O4 nano particles approximately 5 nm in size are dispersed in a porous carbon matrix. The nanocomposite powders prepared at 800 degrees C exhibit a high specific capacitance calculated from cyclic voltammogram of 350 and 600 F g(-1) at a sweep rate of 1 and 0.1 mV s(-1), respectively. The influence of the heating temperature on the structure and the electrochemical properties of nanocomposite powders is also discussed. (C) 2011 Elsevier Ltd. All rights reserved.
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页码：237 / 244
页数：8
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