摘要
采用直接沉淀法制备了β-Ni(OH)2前驱体,经热处理后得到样品粉末。采用XRD、SEM和BET测试技术对样品进行了物性表征。结果表明,样品为立方相的NiO。用循环伏安、恒流充放电和交流阻抗研究了其超级电容性能。结果表明,所制备的NiO具有典型的法拉第赝电容特性。当pH值为11～12,沉淀温度为30℃条件下制备出Ni(OH)2前驱体,经300℃热处理3h后得到的NiO的比容量最大。当充放电电流密度为3×10-3A/cm2时,电极材料的比容量达到346F/g,电极电化学反应的电极电阻和液接电阻分别为0.24和0.085Ω,且具有良好的循环寿命。5×10-3A/cm2循环100次后,比电容为291.5F/g,充放电效率为93.5%。
β-Ni（ OH）2 precursor was prepared by direct depositing and then sample powder was obtained by calcining the preparedβ-Ni （OH） 2. The results of XRD, SEM and BET for the product show that the samples were cubic NiO. Its supercapacitor properties were studied by cyclic voltammetry （ CV）, constant current charge/discharge and electrochemical impedance spectroscopy （EIS）. The results indicate that NiO exhibits typical Faraday capacitance characteristics. When pH is 11 - 12, deposition temperature is 30 ℃and calcining temperature is 300℃ , the specific capacitance of NiO could reach 346 F/g at 3 ×10^-3 A/cm^2. The resistance of electrode electrochemistry reaction is 0. 24 Ω, the resistance related to the conductivity of the electrode and electrolyte is 0. 085 Ω. The obtained NiO has a long cycle life. After 100 times cycles by 5^-3 A/cm^2 the specific capacitance remains 291.5 F/g and the coulombic efficiency is 93.5%.
出处
《应用化学》
CAS
CSCD
北大核心
2007年第8期873-877,共5页
Chinese Journal of Applied Chemistry
基金
教育部博士点基金资助项目(20050217019)
关键词
超级电容器
氧化镍
直接沉淀法
supercapacitor,nickel oxide,direct deposition
