MnO2-embedded-in-mesoporous-carbon-wall structure for use as electrochemical capacitors.
MnO2-embedded-in-mesoporous-carbon-wall structure for use as electrochemical capacitors.
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DOI：
10.1021/jp056754n
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发表时间：
2006-03
期刊：
影响因子：
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通讯作者：
Xiaoping Dong;Weihua Shen;Jinlou Gu;Liangming Xiong;Yufang Zhu;H. Li;Jianlin Shi
中科院分区：
文献类型：
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作者：
Xiaoping Dong;Weihua Shen;Jinlou Gu;Liangming Xiong;Yufang Zhu;H. Li;Jianlin Shi
采用原位还原法合成了一种新型结构的MnO（2）/介孔碳（MnC）复合材料。通过高锰酸盐离子与碳的氧化还原反应，合成了MnO（2）纳米粒子，并将其嵌入到CMK-3材料的介孔碳壁中。采用热重分析（TG）、X射线光电子能谱（XPS）、X射线衍射（XRD）、氮吸附、透射电镜（TEM）和循环伏安法对复合材料进行了表征。结果表明，不同浓度的高锰酸钾水溶液处理CMK-3，可以在保持有序介孔结构和较大比表面积的同时，将不同含量的MnO（2）引入到CMK-3的孔中。从氮吸附等温线的数据来看，增加MnO（2）含量并没有导致孔径减小，这表明MnO（2）纳米颗粒嵌入孔壁中，如TEM观察所证明的。我们得到了超过200 F/g的MnC复合材料和600 F/g的MnO（2），这些材料具有高的电化学稳定性和高的可逆性。
We present an in situ reduction method to synthesize a novel structured MnO(2)/mesoporous carbon (MnC) composite. MnO(2) nanoparticles have been synthesized and embedded into the mesoporous carbon wall of CMK-3 materials by the redox reaction between permanganate ions and carbons. Thermogravimetric analysis (TG), X-ray photoelectron spectrum (XPS), X-ray diffraction (XRD), nitrogen sorption, transmission electron microscopy (TEM), and cyclic voltammetry were employed to characterize these composite materials. The results show that different MnO(2) contents could be introduced into the pores of CMK-3 treated with different concentrations of potassium permanganate aqueous solution, while retaining the ordered mesostructure and larger surface area. Increasing the MnO(2) content did not result in a decrease in pore size from the data of nitrogen sorption isotherms, indicating that MnO(2) nanoparticles are embedded in the pore wall, as evidenced by TEM observation. We obtained a large specific capacitance over 200 F/g for the MnC composite and 600 F/g for the MnO(2), and these materials have high electrochemical stability and high reversibility.