Citation: TIAN Ying, YAN Jing-Wang, LIU Xiao-Xue, XUE Rong, YI Bao-Lian. Electrochemical Capacitance of Composites with MnOx Loaded on the Surface of Activated Carbon Electrodes[J]. Acta Physico-Chimica Sinica, ;2010, 26(08): 2151-2157. doi: 10.3866/PKU.WHXB20100636 shu

Electrochemical Capacitance of Composites with MnOx Loaded on the Surface of Activated Carbon Electrodes

1.
1. Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning Province, P. R. China;
2. College of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, Liaoning Province, P. R. China

Received Date: 22 December 2009
Available Online: 10 May 2010
Fund Project:

Activated carbon/manganese oxide (MnOx) composites were prepared by the thermal decomposition of Mn(NO₃)₂ that was impregnated on the surface of activated carbon XC-72 with a specific surface area of 250 m²·g^-1 and on YEC-8 with a specific surface area of 1726 m²·g^-1 at 200 ℃. The surface morphology and crystalline structure of the composites were investigated using scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively. The electrochemical properties of the composites were tested by cyclic voltammetry, galvanostatic charge-discharge, and impedance spectroscopy. We found that α-Mn₂O₃ and α-Mn₃O₄ were formed when the composites were annealed at 200 ℃. At mass ratios of C and MnOx of 2∶1 and 9∶1, the specific capacitance of MnO_x in the composites of XC-72/MnO_x was 499 and 435 F·g^-1 and the specific capacitance of MnOx in the composites of YEC-8/MnO_x was 554 and 606 F·g^-1, respectively. This suggests a significant contribution of pseudocapacitance from MnOx to the specific capacitance of the electrode.
- Supercapacitor,
- Manganese oxide,
- Activated carbon,
- Thermal decomposition
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