微氧化改性制备自支撑Ti_(3)C_(2)/TiO_(2)超级电容器薄膜电极

Preparation of Self-supporting Ti_(3)C_(2)/TiO_(2) Film Electrodes for Supercapacitors by MicroOxidation Modifi cation

本文将Ti_(3)C_(2)纳米片进行微氧化,在Ti_(3)C_(2)纳米片表面生成较多的TiO_(2)颗粒,通过真空抽滤的方法成功制备了具有柔性的自支撑Ti_(3)C_(2)/TiO_(2)薄膜电极。制备的Ti_(3)C_(2)/TiO_(2)薄膜电极在1A/g的电流密度下具有544 F/g的高比电容,经过1000次循环充放电之后电容保持率仍然高达92%。电极动力学分析计算表明,在扫描速率为2mV/s时,赝电容控制占比为76%,在10mV/s时升高至96%。与未改性的Ti_(3)C_(2)电极相比,本实验制备的Ti_(3)C_(2)/TiO_(2)薄膜电极电化学性能明显增强,这主要归因于部分氧化生成的TiO_(2)颗粒附着在Ti_(3)C_(2)纳米片表面,增大了Ti_(3)C_(2)的层间距,增加了离子传输通道,提高了电化学性能。

In this paper,Ti_(3)C_(2)nanosheets were micro-oxidized to generate more TiO_(2)particles on the surface of Ti_(3)C_(2)nanosheets,and a flexible self-supporting Ti_(3)C_(2)/TiO_(2)thin film electrode was successfully prepared by vacuum filtration.The Ti_(3)C_(2)/TiO_(2)thin film electrode have a high specific capacitance of 544 F/g at a current density of 1 A/g and the capacitance retention rate is still as high as 92%after 1000 cycles of charge and discharge.Electrode kinetic analysis calculations showed that the pseudocapacitive control accounted for 76%at a scan rate of 2 mV/s and increased to 96%at 10 mV/s.Compared with the unmodified Ti_(3)C_(2)electrode,the electrochemical performance of the Ti_(3)C_(2)/TiO_(2)thin film electrode prepared in this experiment is significantly enhanced,which is mainly due to the partial oxidation of TiO_(2)particles attached to the surface of Ti_(3)C_(2)nanosheets,which increases the interlayer spacing of Ti_(3)C_(2),increasing the ion transport channel and improving the electrochemical performance.