碳纳米纤维/Co_3O_4复合电极的制备及电化学性能研究

Preparation and Electrochemical Performance Study of CNFs/Co_3O_4 Composites

采用静电纺丝制备得到碳纳米纤维(CNFs)无纺布,经预氧化、碳化处理后作为电极支撑材料,再由水热法合成得到海胆状CNFs/Co_3O_4和雪花型CNFs/Co_3O_4-S两种形貌的复合电极材料.通过扫描电子显微镜(SEM),傅里叶红外光谱(FTIR)和X线衍射(XRD)对复合电极材料形貌和结构进行表征,并对其电化学性能进行详细测试.结果表明:在1A/g的电流密度下,雪花型CNFs/Co_3O_4-S比海胆状CNFs/Co_3O_4复合电极材料具有更高的比电容,为451.11F/g,且在1500次充放电后其比电容保留率高达88.07%,具有良好的循环稳定性.

Carbon nanofibers(CNFs) non-woven fabrics prepared by electrospinning were used as electrode support materials after pre-oxidation and carbonization.Different morphologies of composite electrode materials with sea urchin-like CNFs/Co3O4 and snowflake-like CNFs/Co3O4-S were synthesized by hydrothermal method.Scanning electron microscopy (SEM),Fourier transform infrared spectroscopy(FTIR) and X-ray diffraction(XRD) were respectively used to characterize the composites.The electrical performance and properties of the composites were measured by cyclic voltammetry,galvanostatic charge-discharge and impedance methods.The result illustrated that the snowflake-like CNFs/Co3O4-S composite electrode under 1A/g electric current density has a higher electrochemical capacitance of 451.11F/g and maintained 88.07% of its initial capacitance after 1500 cycles.