A dandelion-like carbon microsphere/MnO2 nanosheets composite for supercapacitors
作者：Xuanxuan Zhang, Fen Ran*, Huili Fan, Lingren Wang, Yongtao Tan, Lei Zhao, Xiaoming Li, Lingbin Kong,
關鍵字：supercapacitors
論文來源：期刊
具體來源：Journal of Energy Chemistry
發(fā)表時間：2014年
This article reported the electrochemical performance of a novel cabon microsphere/MnO2 nanosheets (CMS/MnO2) composite prepared by a in situ self-limiting deposition method under hydrothermal condition. The results of scanning electron microscopy (SEM) and transmission electron microscopy (TEM) revealed that MnO2 nanosheets homogeneously grew onto the surface of CMS to form a loose-packed and dandelion-like core/shell microstructure. The unique microstructure plays a basic role in electrochemical accessibility of electrolyte to MnO2 active material and a fast diffusion rate within the redox phase. The results of cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectrometry indicated that the prepared CMS/MnO2 composite presented high capacitance of 181 F·g?1 and long cycle life of 61% capacity retention after 2000 charge/discharge cycles in 1 mol/L Na2SO4 solution, which show strong promise for high-rate electrochemical capacitive energy storage applications