导电钛白粉在水中的分散性及电化学性能研究

摘要

利用水溶性高分子(聚乙烯吡咯烷酮、海藻酸钠、羧甲基纤维素钠)对导电钛白粉进行表面包覆.通过FT-IR、UV-Vis、XRD、SEM对包覆前后的导电钛白粉进行了表征.结果表明,3种高分子材料包覆在导电钛白粉表面,且并不影响导电钛白粉基底结构;分散性实验结果表明高分子包覆后的导电钛白粉分散性提高,羧甲基纤维素钠的包覆效果最好.电化学研究结果说明包覆后的导电钛白粉氧化还原峰的形状没有随着扫描速率的增加发生明显的变化,该复合电极片具有较高的倍率性能以及较小的内阻;交流阻抗对比分析可得,羧甲基纤维素钠包覆后的产物高频区容抗弧半径最小,低频区斜率最大,导电性能最好.%Nanoscale titanium dioxide (TiO2) conductive powder was coated by hydrophilic polymers (polyvinylpyrrolidone (PVP), sodium alginate (SA) and sodium carboxymethyl cellulose (CMC)) on the surface.The coated powder was confirmed by fourier infrared spectrometer (FT-IR), ultraviolet and visible spectrophotometer, X-ray diffraction (XRD) and Scanning electron microscope (SEM).The results showed that three kinds of polymers were coated on the surface of the powder respectively, and did not affect the basal structure of TiO2 conductive powder.The results of the dispersion experiment showed that the dispersion of the coated powder was improved and the effect of CMC was the best.The results of electrochemical research showed that with an increase in the scan rate, the shape of the anodic and cathodic peaks of the coated powder did not change obviously, and the composite electrodes were with high ratio of performance and low internal resistance.The impedance measurements instructed that the capacitance arc radius of TiO2-CMC powder was the smallest in the high frequency region, the slope was the maximum in the low frequency region, and its conductive performance was the most excellent.