ABSTRACT

Novel MnS @ Mn₃O₄/C nanoflakes are prepared via two step method using natural polysaccharide. The structural, morphological and electrochemical features of the nanocomposite are investigated by X-ray diffraction, Raman spectroscopy, scanning electron microscopy, transmission electron microscopy, cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance analysis. This synergetic core-shell nanostructure exhibits the maximum specific capacity of 567.5 C g⁻¹ at a current density of 1 Ag⁻¹. MnS@ Mn₃O₄/C//activated carbon asymmetric hybrid supercapacitor is assembled, which reveals the excellent specific capacitance (45.91 Fg⁻¹), cyclic stability (71% even after 1000 cycles) and energy density (12.50 WhKg⁻¹), indicating that the prepared nanocomposite can be useful for the fabrication of high performance supercapacitor devices.

摘要

新型 MnS @ Mn ₃ O ₄ /C 纳米薄片是使用天然多糖通过两步法制备的。通过 X 射线衍射、拉曼光谱、扫描电子显微镜、透射电子显微镜、循环伏安法、恒电流充放电和电化学阻抗分析研究了纳米复合材料的结构、形态和电化学特征。这种协同核壳纳米结构在1 Ag ^-1的电流密度下表现出567.5 C g ^-1的最大比容量。组装MnS@Mn ₃ O ₄ /C//活性炭不对称混合超级电容器，显示出优异的比电容（45.91 Fg ^-1)、循环稳定性（即使在 1000 次循环后仍为 71%）和能量密度（12.50 WhKg ^-1），表明制备的纳米复合材料可用于制造高性能超级电容器器件。