摘要
为了获得具有优异电容性能的超级电容器电极材料,采用溶胶–凝胶法制备纳米材料—锶铋氧化物(SBO),并运用水热法合成Sr-Bi-O/MWCNT(多壁碳纳米管)复合电极材料。通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱分析仪(XPS)、傅里叶变换红外光谱(FTIR)和电化学测试等分析研究了复合材料的形貌、结构和电化学性能。结果表明,6 mol/L KOH电解液中SBO/MWCNT在1 A/g电流密度下比电容高达516.8 F/g,且高于SBO(446.5 F/g)和MWCNT(12 F/g)。将电流密度提高至5 A/g,其比电容仍维持在446.4 F/g。EIS测试结果表明其具有较好的频率响应。这些结果显示SBO/MWCNT是一种理想电极材料,在能量储存和转换装置中有巨大的应用价值。
In order to obtain materials for electrochemical capacitors with excellent capacitance performances, we adopted the sol-gel process to prepare strontium bismuth oxide(SBO) nanomaterials, and successfully synthesized an SBO/MWCNT composite used as electrode by a hydrothermal method. Moreover, X-ray diffraction(XRD), scanning electron microscopy(SEM), X-ray photoelectron spectroscopy(XPS), Fourier transform infrared spectroscopy(FT-IR), and electrochemical measurements were performed to investigate the morphology, structure and supercapacitive performance of the composite. The results showed that the SBO/MWCNT electrode presented a specific capacitance of 516.8 F/g at a current density of 1 A/g in a 6 mol/L KOH aqueous solution. This value was much higher than that of SBO electrodes(446.5 F/g) and MWCNT electrodes(12.0 F/g). If the current density increased to 5 A/g, the specific capacitance of SBO/MWCNT electrode would remain as high as 446.4 F/g. EIS results indicated that the electrode also had a good frequency response. These results show that SBO/MWCNT is a promising composite electrode material with great application for energy storage and conversion devices.
作者
刘云鹏
齐小涵
李乐
李雪
韩颖慧
LIU Yunpeng;QI Xiaohan;LI Le;LI Xue;HAN Yinghui(Distributed Energy Storage and Mierogrid Hebei Key Laboratory,North China Electric Power University,Baoding 071003,China;School of Mathematics and Physics,North China Electric Power University,Baoding 071003,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2018年第7期2231-2238,共8页
High Voltage Engineering
基金
中央高校基本科研业务费专项基金(2015ZZD13)
河北省电力科学研究院科技项目(14214503D)~~
关键词
溶胶–凝胶法
水热法
Sr-Bi-O
MWCNT
能量密度
比电容
超级电容器
电化学性能
sol-gel process
hydrothermal method
strontium bismuth oxide
MWCNT
energy density
specific capaci-tance
supercapacitor
electrochemical performance