并流沉淀法合成氧化镍及其电容性能  

Preparation of NiO by Parallel Flow Precipitation Process and Its Capacitance Performance

作　　者：陈野[1] 刘良[1] 张尊波[1] 向琪[1] 

机构地区：[1]哈尔滨工程大学材料科学与化学工程学院,黑龙江哈尔滨150001

出　　处：《精细化工》2008年第5期424-427,共4页Fine Chemicals

基　　金：教育部博士点基金资助(20050217019)~~

摘　　要：以硝酸镍和碳酸铵为原料,采用并流沉淀法得到碱式碳酸镍前驱体,经300℃热处理后得到NiO。X射线衍射分析表明,其衍射峰位置分别为37.2°、43.2°和62.8°,与标准图谱比照,所制样品为立方相的NiO。按m(NiO):m(乙炔黑):m(聚四氟乙烯)=75:15:10制备电极材料,在电解液c(KOH)=5mol.L-1的三电极体系中,通过循环伏安、交流阻抗和恒流充放电对其超级电容性能进行了考察。不同扫速循环伏安曲线表明,该材料具有典型的超级电容特性;交流阻抗测试结果表明,溶液电阻RL为0.5Ω,电极电阻RE为0.6Ω;在电位为0～0.4V,10mA.cm-2恒流充放电条件下,测得其放电比容量可达352.7F.g-1。经12mA.cm-2恒电流循环100次,其放电效率仍达97.5%。Taking Ni （NO3 ）2 and （NH）2CO3 as main raw materials, the precipitated precursor was prepared by parallel flow precipitation process and then NiO was synthesized by heat treatment at 300 ℃. Its structure was studied by XRD,and the diffraction peaks were at 37.2° ,43.2° and 62. 8° ,being consistent with the normal pattern. The results show that the sample is NiO of cubic system. The electrode material was prepared in the ratio m （ NiO ） ： m （ black ethine ） ： m （ PTFE ） = 75 ： 15 ： 10. The electrochemical properties were tested by cyclic voltammetry, AC impedance and constant current charge/discharge in three-electrode system. The result of cyclic voltammetry shows that the material has a perfect supercapacitor performance in the electrolyte of 5 mol. L^-1KOH. The values of RE and RE by test of AC impedance are 0. 5 Ω and 0.6 Ω respectively. The specific discharge capacitance is 352.7 F.g^-1 within 0 - 0.4 V potential and at 10 mA . cm^-2 current density. Long cycle life and high coulombic efficiency were also demonstrated after charge/discharge for 100 cycles at 12 mA . cm^-2.

关 键 词：超级电容器 NIO 并流沉淀法 循环伏安 交流阻抗 恒流充放 功能材料 

分 类 号：TM911[电气工程—电力电子与电力传动]