摘要
采用溶胶 凝胶法制得钙钛矿型PbTiO3纳米粉体 ,借助XRD、TEM以及循环伏安测试对其性质作了表征。对掺杂纳米PbTiO3的MnO2 电极进行了循环伏安、深度恒流放电和充放电等测试。结果表明 ,在 40 %的KOH电解质溶液中 ,纳米PbTiO3与MnO2 形成一系列不同价态的复合氧化物 ,改变了MnO2 的放电机理 ,抑制了电化学惰性物质Mn3O4 的生成 ,放电容量平均提高了 45 % ,充放电容量较I .C .No .1样品也提高了 10 %～40 %。
Nanosized PbTiO 3 powder was prepared by a sol-gel method and characterized by XRD, TEM and CV techniques. PbTiO 3 modified MnO 2 electrodes were fabricated and their electrochemical behavior were studied by means of galvonostatic charge-discharge and CV experiments. The results indicated that the nano- sized PbTiO 3 forms a series of complex oxides with MnO 2 of different valency and prevents the formation of Mn 3O 4 during the course of electrode reaction. The discharge capacity of MnO 2 electrodes modified with 5 0%(mass fraction) nanophase PbTiO 3 is in average 45% higher than that of I.C.No.1 in 40%(mass fraction) KOH electrolytes, and charge- discharge efficiency is much improved by 10%～40%.
出处
《应用化学》
CAS
CSCD
北大核心
2003年第4期336-340,共5页
Chinese Journal of Applied Chemistry
基金
国家自然科学基金资助项目 ( 5 0 14 30 2 3)
