超细YMnO_3的硬脂酸溶胶-凝胶法合成及充放电性能  

Synthesis and Charge-Discharge Properties of Ultrafine YMnO_3 Particles by Stearic Acid Sol-Gel Method

作　　者：张莉莉[1] 李陈琳[1] 庄华清[1] 吕兰兰[1] 仲慧[1] 张维光[1] 汪信[2] 

机构地区：[1]淮阴师范学院,江苏省低维材料化学实验室,江苏淮安223300 [2]南京理工大学材料化学实验室,南京210097

出　　处：《硅酸盐学报》2011年第9期1434-1438,共5页Journal of The Chinese Ceramic Society

基　　金：江苏省自然科学基金(BK2010289);江苏省高校自然科学重大(10KJA430005);淮安市科技资助项目

摘　　要：以硬脂酸、Y2O3及Mn(NO3)2为原料,采用硬脂酸溶胶-凝胶法,在700℃保温8 h制备钙钛矿型复合氧化物YMnO3纳米颗粒;并以YMnO3作为超级电容器电极材料,采用恒电流充放电测试方法研究YMnO3的性能。结果表明:YMnO3表现出优良的电化学性能,在6 mol/L的KOH电解液中,单电极比电容可达164.19 F/g;在5 mA/g电流密度、不同充放电电位下得出最佳充放电电位为0.1～0.3 V,表明电容器的充放电性能良好,等效串联电阻仅为1.0Ω;在充放电50次后,YMnO3的比容量衰减不到10%,说明产物具有较好的电化学稳定性,有望成为理想的超级电容器电极材料。Yttrium manganite（YMnO3）,a novel kind of perovskite oxide,was synthesized by stearic acid sol–gel method using stearic acid,Y2O3,and Mn（NO3）2 as raw materials.Structure and morphology of YMnO3 were characterized using X-ray diffraction and transmission electron microscopy.Results show that ultrafine YMnO3 particles were fabricated at 700 ℃ within 8 h.Electrochemical performance of YMnO3 was investigated by constant current charge–discharge technique.The as-prepared YMnO3 electrode has excellent electrochemical performance,and the specific capacitance as a single electrode is up to 164.19 F/g in 6 mol/L KOH electrolyte solution.At 5 mA/g current density,different potentials were applied to obtain the optimum cell voltage from 0.1 V to 0.3 V.Under this condition,the supercapacitor exhibits good charge–discharge capacities and equivalent series resistance is only 1.0 Ω.After 50 charge–discharge cycles,specific capacitance of YMnO3 composite is reduced within 10%,indicating that YMnO3 composite has excellent and steady electrochemical performance and is a promising electrode material for supercapacitors.

关 键 词：锰酸钇 硬脂酸溶胶-凝胶法 充放电 比电容 

分 类 号：TM911.15[电气工程—电力电子与电力传动]