Nam Inho, Kim Nam Dong, Kim Gil-Pyo, Park Junsu, Yi Jongheop
World Class University Program of Chemical Convergence for Energy and Environment, School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul 151-742, Republic of Korea.
J Nanosci Nanotechnol. 2012 Jul;12(7):5704-8. doi: 10.1166/jnn.2012.6404.
A supercapacitor has the advantages of both the conventional capacitors and the rechargeable batteries. Mn oxide is generally recognized one of the potential materials that can be used for a supercapacitor, but its low conductivity is a limiting factor for electrode materials. In this study, a hybrid of amorphous Mn oxide (AMO) and ordered mesoporous carbon (OMC) was prepared and characterized using X-ray diffraction, transmission electron microscopy, N2/77 K sorption techniques, and electrochemical analyses. The findings indicate that the electrochemical activities of Mn oxide were facilitated when it was in the hybrid state because OMC acted as a pathway for both the electrolyte ions and the electrons due to the characteristics of the ordered mesoporous structure. The ordered mesoporous structure of OMC was well maintained even after hybridization with amorphous Mn oxide. The electrochemical-activity tests revealed that the AMO/OMC hybrid had a higher specific capacitance and conductivity than pure Mn oxide. In the case where the Mn/C weight ratio was 0.75, the composite showed a high capacitance of 153 F/g, which was much higher than that for pure Mn oxide, due to the structural effects of OMC.
超级电容器兼具传统电容器和可充电电池的优点。氧化锰通常被认为是可用于超级电容器的潜在材料之一，但其低电导率是电极材料的一个限制因素。在本研究中，制备了非晶态氧化锰（AMO）和有序介孔碳（OMC）的复合材料，并采用X射线衍射、透射电子显微镜、N2/77K吸附技术和电化学分析对其进行了表征。研究结果表明，当氧化锰处于混合状态时，其电化学活性得到促进，这是因为由于有序介孔结构的特性，OMC充当了电解质离子和电子的传输通道。即使与非晶态氧化锰杂化后，OMC的有序介孔结构仍能得到很好的保持。电化学活性测试表明，AMO/OMC复合材料比纯氧化锰具有更高的比电容和电导率。在Mn/C重量比为0.75的情况下，由于OMC的结构效应，该复合材料表现出153 F/g的高电容，远高于纯氧化锰的电容。
