ZnO模板法合成的MnO2纳米棒及其电容特性研究

摘要

以自制的 ZnO 纳米棒为模板合成了 MnO2 纳米棒.x-射线衍射、红外光谱和透射电镜等对产物成分、晶型结构及其形貌的分析结果表明,所得样品均为平均直径20nm左右、平均长度约180nm的α-MnO2 纳米棒.循环伏安和恒流充放电测试分析所得样品超级电容特性的结果表明,在 1mol/L Na2SO4 水溶液中,2mA 电流和 0～1.0V(vs SCE)电位范围内,所得 MnO2 电极的初始放电比容量可达到 105F/g,1000 次循环充放电后电极的放电比容量保持率近90%.%α-MnO2 nanorods were synthesized by using prefabricated ZnO nanorods as template. The composition, structure and morphology of the as-synthesized samples were characterized by XRD, IR and TEM. The results showed that the samples were α-MnO2 nanorods with the average diameter of about 20nm and the average length of about 180nm. The electrochemical performance of the samples as an electrode material for supercapcitors was further evaluated by the means of cyclic voltammetry and galvanostatic charge-discharge tests. The results indicated that initial specific capacitance of single MnO2 electrode reached 105F/g at the current of 2mA, in 1.0mol/L Na2SO4 electrolyte within the potential range of 0 ～ 1.0 V ( vs. SCE) and 90％ was maintained after 1000 cyels.