微晶Na0.7MnO2.05的制备及其在水溶液中的充放电特性研究

摘要

利用十二核锰簇合物[Mn12O12(CH3COO)16(H2O)4]为前驱物,通过先碱解再灼烧的方法合成了一种钠锰氧化合物Na0.7MnO2.05.扫描电子显微镜(SEM)观察结果表明产物由微米级的扁平棒状晶体组成.电化学测试表明,Na0.7MnO2.05是一种性能比较优良的超级电容器电极材料.在0.5 mol· L-1 Na2SO4电解质溶液中和0～0.8 V电位窗口范围内,具有良好的循环稳定性能,充放电速率为0.125A·g-1时单电极比电容达121 F·g-1.%The sodium manganese oxide Nao0.7MnO2.05 was synthesized through alkaline hydrolysis of [Mn12O12 (CH3COO)16(H2O)4] followed by thermal calcinations. Scanning electron microscope (SEM) study revealed that the as prepared Na0.7MnO2.05 was composed of flat micro-rod crystals. Electrochemical studies demonstrated that Na0.7MnO2.05 is a good electrode material for supercapacitor. The specific capacitance value of the sample is about 121 F·g-1 at the charge/discharge rate of 0.125 A·g-1 in 0.5 mol·L-1 Na2SO4 electrolyte.