钾锰氧化物:电化学控制合成及其电容器性质(英文)  

Potassium Manganese Oxides:Electrochemically Controlled Synthesis and Capacitor Properties

作　　者：冯良东[1,2] 石建军[1] 姜立萍[1] 朱俊杰[1] 

机构地区：[1]生命分析化学教育部重点实验室南京大学化学化工学院,南京210093 [2]江苏省凹土资源利用重点实验室淮阴工学院化工系,淮安223003

出　　处：《无机化学学报》2010年第12期2289-2298,共10页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.20635020,20821063,20605011);江苏省自然科学基金(No.BK2008196);江苏省"青蓝工程"资助项目

摘　　要：0 Introduction Due to their excellent electrochemical properties,metal oxides such as RuO2 and MnO2 have shown high performance as electrode material in supercapacitors[1-4].AlthoughPotassium manganese oxides were prepared by cathodic deposition from aqueous KMnO4 solution on an indium tin oxide slide.The products were characterized by XRD,XPS and SEM techniques.The as-prepared products were potassium manganese oxides with different manganese valence states.The component,morphology and size of the products could be controlled through adjusting the preparation parameters such as deposition potential,deposition time and acidity of the electrolyte.The results show that the deposition of potassium manganese oxide from aqueous KMnO4 is a pH value dependent procedure.Due to the facilitating of intercalation and deintercalation of cations,the specific capacitance of the products deposited for 500 s is higher than that of 3 000 and 6 000 s.At a scan rate of 2 mV·s-1 in 0.2 mol·L-1 K2SO4 aqueous electrolyte,the specific capacitances of products are 119.4,99.5 and 109.0 F·g-1 corresponding to the deposition time of 500,3 000 and 6 000 s,respectively.Electrochemical experiments indicate that the reversibility and performance of these potassium manganese oxides are also changed with the deposition time.

关 键 词：钾锰氧化物 阴极沉积 形貌 电容器 

分 类 号：O611.62[理学—无机化学]