Ti3C2Tx与MnO2纳米线复合薄膜的制备及其电化学性能分析

Preparation and electrochemical performance analysis of Ti3C2Tx and MnO2 nanowire composite films

类石墨烯过渡金属碳化物(MXene)是一类新兴的导电二维材料,具有很好的电化学储能性能。MXene自支撑膜中二维片层的二次堆积会影响离子传输,降低其比电容。MnO2是一种优良的赝电容材料。两者复合有望提高MXene的比电容。首先对制备的二氧化锰(MnO2)纳米线进行改性处理后与Ti3C2Tx(MXene)混合,真空辅助抽滤得到复合薄膜。然后对复合薄膜进行结构表征及电化学性能测试。研究了MnO2的参杂量对电极材料的质量比电容的影响,并对质量比电容提高的机理进行了分析。实验结果表明,MnO2重量比为16.6%时,与纯MXene膜相比,复合薄膜的比电容增加到116F/g,增加了70%,MnO2纳米线的加入显著提高了复合薄膜的电化学储能性能。

MXene is a group of emerging conductive two-dimensional materials with good electrochemical energy storage performance. The self-stacking in self-supporting film will affect ion transfer which will decrease the specific capacitance. manganese dioxide( MnO2) is a kind of excellent pseudocapacitance material,the composites made from M Xene and M nO2 are expected to have high specific capacitance. In this research,MnO2 nanowires were prepared and surface modified,and then vacuum-filtered with Ti3C2Tx( MXene) to obtain self-supporting composite films. The structure and electrochemical performance of the composite films were tested. The influence of the amount of MnO2 on the specific capacitance of the electrodes were studied and the mechanism was analyzed. The results show that the specific capacitance increases to 116 F/g when the amount of MnO2 reaches to 16. 6%( wt),which if 70%higher compared to that of pure Ti3C2 Txfilm. In conclusion the addition of MnO2 nanowires improves the electrochemical energy storage performance of the composite film.