泡沫镍支撑的锌钴氧化物电极的制备及其超电容性能  

Synthesis of zinc cobalt oxide/nickel foam electrode and its supercapacitor properties

作　　者：焦新艳 赵智洋 周文昭 蒋宇轩 郝青丽[1] JIAO Xinyan;ZHAO Zhiyang;ZHOU Wenzhao;JIANG Yuxuan;HAO Qingli(College of Chemical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学化工学院,南京210094

出　　处：《中国科技论文》2018年第4期470-473,477,共5页China Sciencepaper

基　　金：高等学校博士学科点专项科研基金资助项目(20133219110018;20133219110015);南京理工大学本科生科研训练"百千万"计划资助项目(201610288020)

摘　　要：针对目前超级电容器在大电流密度下循环性能不够优异的问题,采用无模板自然生长法制备了泡沫镍支撑的锌钴氧化物纳米簇阵列电极,使用扫描电子显微镜和透射电子显微镜对材料表面形貌进行表征,利用X射线衍射仪对材料的结构进行探究。通过循环伏安法、恒电流充放电测试、电化学阻抗测定等一系列电化学表征手段表征了所制备材料的超电容性能。结果表明,锌钴氧化物的形貌为纳米线(直径为100~200nm)聚集而成的纳米簇,交错地在泡沫镍骨架上生长。电极在0.5A/g电流密度下的比电容高达1 592F/g。经过10 000次循环后质量比电容仍有101.7%的保持率。根据电化学阻抗谱的测试结果,其电荷传递电阻仅为0.25Ω,显示出所制备材料良好的电化学性能。To relieve the problem that the cycle stability of a supercapacitor electrode is not always satisfying in high current density,an electrode consisted of zinc cobalt oxide nanoclusters arrays which stand freely on nickel foam were prepared by a template-free growth method.The morphology was observed by scanning electron microscopy(SEM)and transmission electron microscopy(TEM).The structure was characterized by X-ray diffraction(XRD).The electrochemical performance of the electrode was investigated by cyclic voltammetry,galvanostatic charge-discharge testing and electrochemical impedance spectroscopy(EIS).The results shows that the morphology of zinc-cobalt oxide is nanoclusters with a lot of nanowires(100-200 nm in diameter).The nanowires are nearly vertically and densely grown on the nickel foam substrate.The electrode has a specific capacitance of 1 592 F/g at 0.5 A/g and a capacitance retention rate of 101.7%after 10 000 charge-discharge cycles.According to the results of EIS,the charge transfer resistance is only 0.25Ω,which shows the outstanding electrochemical characters of the prepared materials.

关 键 词：材料学 锌钴氧化物 纳米簇 超级电容器 电极材料 循环稳定性 

分 类 号：TB332[一般工业技术—材料科学与工程]