A novel hydrothermal synthesis and characterisation of porous Mn3O4 for supercapacitors with high rate capability
A novel hydrothermal synthesis and characterisation of porous Mn3O4 for supercapacitors with high rate capability
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DOI：
10.1039/c4ra10175h
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发表时间：
2015-01
期刊：
影响因子：
3.9
通讯作者：
Fengyu Yang;Min-shou Zhao;Q. Sun;Y. Qiao
中科院分区：
文献类型：
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作者：
Fengyu Yang;Min-shou Zhao;Q. Sun;Y. Qiao
通过添加表面活性剂十六烷基三甲基溴化铵（CTAB），采用新型水热法成功合成了多孔纳米结构Mn3O4颗粒。通过热重和差热分析（TG/DTA）、X射线衍射（XRD）、场发射扫描电子显微镜（SEM）、透射电子显微镜（TEM）和N2吸附技术对它们进行了表征。通过恒电流充放电、循环伏安法和电化学阻抗谱在1 M Na2SO4水溶液电解质中研究了样品的电化学性能。它表现出高比电容（0.5 A g−1 时为 232.5 F g−1）和良好的倍率性能（5 A g−1 时为 190 F g−1），这可归因于其多孔结构、表面的缺陷和空位。在5 A g−1电流密度下循环5000次后电容保持率达到78%。结果表明，Mn3O4具有作为高性能超级电容器电极材料的潜力。
Porous nanostructured Mn3O4 particles were successfully synthesized by a novel hydrothermal method via adding the surfactant hexadecyltrimethylammonium bromide (CTAB). They were characterized by the techniques of thermogravimetric and differential thermal analysis (TG/DTA), X-ray diffraction (XRD), field emission scanning electron microscopy (SEM), transmission electron microscopy (TEM), and N2-adsorption. The electrochemical performance of the sample was studied by galvanostatic charge–discharge, cyclic voltammetry and electrochemical impedance spectroscopy in 1 M Na2SO4 aqueous solution electrolyte. It exhibits a high specific capacitance (232.5 F g−1 at 0.5 A g−1) and good rate capability (190 F g−1 at 5 A g−1), which can be attributed to its porous structure, the defects and vacancies on the surface. The capacitance retention reaches 78% after 5000 cycles at a current density of 5 A g−1. The results show that Mn3O4 has the potential to be used as the electrode material for a supercapacitor with high performance.