微晶形状对锐钛矿型TiO_(2)材料超级电容器性能的影响  

Effect of anisotropic plane of titanium dioxideon supercapacitor performance

作　　者：王小东 张研研 许春香[1] 王红霞[1] 张王刚[1] 李涛涛 WANG Xiaodong;ZHANG Yanyany;XU Chunxiang;WANG Hongxia;ZHANG Wanggang;LI Taotao(School of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China;School of Mechanical Engineering,North University of China,030051,China)

机构地区：[1]太原理工大学材料科学与工程学院,太原030024 [2]中北大学机械工程学院,太原030051

出　　处：《功能材料》2023年第7期7018-7025,共8页Journal of Functional Materials

基　　金：山西省重点研发计划项目(201903D42108);山西省关键核心技术和共性技术研发攻关专项项目(20201102018)。

摘　　要：研究了晶粒各向异性对锐钛矿型TiO_(2)电化学性能的影响,这对超级电容器材料性能提升具有显著的意义。利用水热合成法,以HF和H_(2)SO_(4)为不同的酸性形貌诱导剂,钛酸四丁酯为钛源制备了片状和球状微晶的TiO_(2),两者会暴露不同的晶面。经X射线衍射(XRD)、扫描电子显微镜(SEM)及透射电子显微镜(TEM)证实片状TiO_(2)暴露的晶面是高活性{001},而球状TiO_(2)暴露的晶面具有随机性。采用X射线光电子能谱(XPS)和比表面及孔隙度分析(BET)以及相应的电化学性能测试:结果表明片状TiO_(2)的比表面积(112.76 m^(2)/g)是球状TiO_(2)比表面积(46.88 m^(2)/g)的2.41倍,片状TiO_(2)超级电容器的比电容(174.0 F/g)是球状TiO_(2)超级电容器比电容(67.00 F/g)的2.59倍,同时片状TiO_(2)超级电容器与球状TiO_(2)超级电容器相比,表现出更高的循环稳定性。片状TiO_(2)优异的性能主要归因于高比面积以及暴露的高活性{001}晶面.In this paper,the effect of grain anisotropy on the electrochemical performance of anatase TiO_(2) was studied,which is significant for the improvement of supercapacitor material performance.Using hydrothermal synthesis,HF and H_(2)SO_(4) were used as different acid morphology inducers,and tetrabutyl titanate was used as titanium source to prepare TiO_(2) in the form of platy and spherical microcrystals,which exposed different crystal faces.X-ray diffraction(XRD),scanning electron microscopy(SEM)and transmission electron microscopy(TEM)confirmed that the crystal faces exposed by platyt TiO_(2) were highly active{001}planes,while the crystal faces exposed by spherical TiO_(2) were random.X-ray photoelectron spectroscopy(XPS)and specific surface and porosity analysis(BET)and corresponding electrochemical performance tests were used:the results showed that the specific surface area of platy TiO_(2)(112.76 m^(2)/g)was 2.41 times that of spherical TiO_(2)(46.88 m^(2)/g),and the specific capacitance of platy TiO_(2) supercapacitor(174.0 F/g)is a spherical TiO_(2) supercapacitor specific capacitance(67.0 F/g),while platy TiO_(2) supercapacitors exhibit higher cycle stability than spherical TiO_(2) supercapacitors.The excellent performance of platy TiO_(2) is mainly attributed to the high specific area and exposed highly active{001}crystal planes.

关 键 词：微晶形状 锐钛矿型TiO_(2) 片状 球形 超级电容器 

分 类 号：TM53[电气工程—电器]