高放电容量二氧化锰纳米材料的水热合成及微结构表征

Hydrothermal synthesis and microstructural characterization of manganese binoxide nanostructures

利用表面活性剂辅助水热反应合成了二氧化锰纳米棒束和纳米片状结构;分析讨论了表面活性剂分子结构对纳米粒子微观形貌的影响。聚乙二醇的长链结构有助于一维纳米结构的形成,阴离子型表面活性剂十六烷基苯磺酸钠通过配合物的方式影响纳米材料的生长。用TEM、SEM对纳米材料进行微结构表征,进一步探讨了其对材料放电性能的影响。

In this paper, the one-dimensional manganese binoxide nanorod bundles and two- dimensional nanosheets were successfully synthesized through surfactant-assisted hydrothermal route. Nanorod and their bundles can be easily obtained by using PEG-400 as surfactant. The functions of surfactants were discussed by the analysis of the molecular structure of surfactant. The linear structure of PEG-400 molecules and the negative functional group of SDBS compound were proposed to contribute to rod- and sheet-like nanostructures, respectively. The XRD, TEM, SEM, and STEM techniques were used to characterize the structures, morphologies, microstructures, and the assembly behavior of nanounits. Every nanorod bundles were formed through lateral assembly of many nanorods with different sizes. The MnO2 nanosheets are the cloth shapes with abundant pit-like structures on their surface. The electrochemical tests showed that these two nanostructures have high discharge capacitance, which can be suggested from their novel one-dimensional and rough surface microstructure.