叶片状Co_3O_4的制备及其电化学性能  

Preparation and Electrochemical Performances of a Leaf-Shaped Co_3O_4

作　　者：杜建功[1] 海振银 李艳芳[1] 崔丹凤[1] 

机构地区：[1]中北大学仪器与电子学院电子测试技术重点实验室,太原030051

出　　处：《微纳电子技术》2016年第10期645-651,共7页Micronanoelectronic Technology

基　　金：国家高技术研究发展计划(863计划)资助项目(2015AA04600);2015年度中北大学科学研究基金资助项目(204-110246)

摘　　要：通过水热法在泡沫镍基板上制备了一种新颖的三维叶片状Co_3O_4,通过X射线衍射(XRD)表征对该叶片状Co_3O_4进行物相分析,通过扫描电子显微镜(SEM)和透射电子显微镜(TEM)对其形貌和晶面结构进行了分析。得出叶片呈现规则六边形形状,长度约为10μm并且叶片末端为梳状形构造。N_2吸附-脱附曲线测试结果表明该叶片状Co_3O_4具有较大的比表面积。X射线光电子能谱(XPS)表征进一步确定了Co_3O_4的化学元素组成,将该Co_3O_4/泡沫镍作为电极在6 mol/L KOH溶液中进行了循环伏安法、恒流充放电和电化学阻抗谱实验,结果表明该Co_3O_4/泡沫镍在1 A·g^(-1)电流密度下,比电容为849.7 F·g^(-1),在10 A·g^(-1)电流密度、比电容为704.7 F·g^(-1)下,经过1 000次循环实验后的电容剩余量仍有82.9%。由于其易于大规模制造的优点,该生长在泡沫镍上的叶片状Co_3O_4有望在超级电容器中得到应用。A novel three-dimensional leaf-shaped Co3O4 on Ni foam substrates was prepared by hydrothermal method.The phase analysis of the leaf-shaped Co3O4 was characterized by X-ray diffraction（XRD）.The morphology and crystal surface structure of the leaf-shaped Co3O4 were analyzed by scanning electron microscope（SEM）and transmission electron microscope（TEM）.It is concluded that the leaves have a regular hexagonal shape with a length of about 10μm and a comb-shaped structure at the ends of the leaves.The N2adsorption-desorption curves test results show that the leaf-shaped Co3O4 has larger specific surface area.Meanwhile the X-ray photoelectron spectroscopy（XPS）characterization further determines the chemical elements of Co3O4.The cyclic voltammetry test,galvanostatic charge/discharge test and electrochemical impedance spectroscopy experiment were investigated with the Co3O4/nickel foam as the electrode in6 mol/L KOH solution.The results show that the specific capacitance of the Co3O4/nickel foam is 849.7 F·g^-1at the current density of 1 A·g^-1,and the retention of capacitance is 82.9%even after 1 000 cycles at the current density of 10 A·g^-1 and the specific capacitance of 704.7 F·g^-1.Because of the advantage of large-scale fabrication,the leaf-shaped Co3O4 on the Ni foam substrate has great promises in the applications as supercapacitors.

关 键 词：三维叶片状Co3O4 泡沫镍 水热法 电化学性能 超级电容器 

分 类 号：O643.32[理学—物理化学]