摘要
以KMnO_4、NaOH和MnCl_2为原料,在室温下采用液相氧化还原法制备了层状二氧化锰电极材料.分别采用X-射线衍射、扫描电子显微镜和N_2吸附-脱附等方法对材料试样的晶型结构、表观形貌和比表面积等物理性能进行了表征;采用循环伏安、恒流充放电和交流阻抗等电化学方法研究了材料试样的电化学性能.研究结果表明:所制备的层状二氧化锰为纳米材料,比表面积为89 m^2·g^(-1),在0.5 mol·L^(-1)Li_2SO_4水系电解液中比电容为96.7 F·g^(-1),等效串联电阻为1Ω,漏电流为0.24 m A,800次循环前后具有良好的循环稳定可逆性.
Nanostructured Layered manganese dioxide as electrode material was prepared by liquid oxidation-reduction method based on KMnO4,NaOH and Mn Cl2 as raw materials at room temperature. The physical structures such as the crystal structure,morphology and specific surface area of the as-prepared electrode material were characterized by X-ray diffraction,scanning electron microscopy and nitrogen adsorption-desorption at 77 K,respectively. The electrochemical performances were evaluated by cyclic voltammetry,galvanostatic charge-discharge and electrochemical impedance spectroscopies and so on. The results showed that the obtained material was nanostructured birnessite-type manganese dioxide with BET specific surface area of 89 m^2·g^-1. The specific capacitance of the Layered manganese dioxide was up to 96. 7 F·g^-1 in 0. 5 mol·L-1Li2SO4 aqueous electrolyte Equivalent series resistance is1 Ω and leakage current was 0. 24 m A,exhibiting excellent cycle and reversible stability in 800 cycles charge-discharge,which maybe have a promising prospect for application in super capacitor.
出处
《江西师范大学学报（自然科学版）》
CAS
北大核心
2015年第6期551-555,共5页
Journal of Jiangxi Normal University(Natural Science Edition)
基金
国家自然科学基金(21463013)
江西省自然科学基金(20142BAB203013)资助项目
关键词
超级电容器
电极材料
层状二氧化锰
电化学性能
super capacitors
lectrode aterial
ayered anganese ioxide
lectrochemical erformances
