Sr-Bi-O/MWCNT复合电极材料的制备及其电化学性能

Preparation and Supercapacitive Performances of Strontium-bismuth-oxygen/Multiwalled Carbon Nanotube Composite

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.