摘要
通过水热法合成的MnO2纳米粉体,用X射线衍射(XRD)证明其为α MnO2,透射电镜(TEM)证明颗粒形貌为棒状,直径20nm左右,长度在0 5～1 0μm之间。用循环伏安、恒电流充放电、交流阻抗等方法研究了该MnO2电极在1mol LKOH溶液中,-0 25～0 45V(vs·Hg HgO)的电位范围内的法拉第"准电容行为"。结果表明:该MnO2电极在1mol LKOH中具有良好的电容性能,其比电容可达300F g以上,在5mA cm2的电流密度下恒电流充放1000个循环后,其容量衰减在10%以内。
The nanophase α-MnO_2, synthesized by hydrothermal method and investigated by transmission electron micrograph (TEM) and X-ray diffraction (XRD), was rod-like particles of the diameter 20 nm and 0.5～1.0 μm long. The performance of faradic pseudocapacitance of α-MnO_2 electrode was studied in 1 molL KOH between -0.25 V and 0.45 V (vs.HgHgO) by cyclic voltammetry, constant-current and AC impedance. The results showed that the electrode could be have fine capacitive performance in 1 molL KOH solution, the specific capacitance could reach 300 Fg above, the decrease of capacitance was within 10% after 1000 charge-discharge cycles in 5 mAcm^2.
出处
《中国锰业》
2004年第4期23-26,30,共5页
China Manganese Industry
基金
广东省教育厅自然科学研究项目 (Z0 2 0 2 2 )
关键词
水热合成
纳米粉体
超级电容器
hydrothermal synthesis
nanophase powder
electrochemical supercapacitor
