| 零维/二维MXene复合膜的制备及其超级电容器性能 | |
| Synthesis and Supercapacitor Performances of 0D/2D MXene Composite Membrane | |
| 摘要: 采用水热法制备了0D/2D复合Ti3C2Tx MXene，利用X射线衍射、动态光散射和荧光光谱表征了其结构与形貌，结果表明形成了量子点吸附于纳米片的Ti3C2Tx复合结构（QDT）。相比未引入量子点的Ti3C2Tx，由QDT组装得到的自支撑膜电极的电化学性能有了显著提高：在三电极体系中，扫速为5 mV·s-1时，比电容为338 F·g-1，当扫速达到2 000 mV·s-1，电容保持率达到46%；在两电极体系中，0.5 A·g-1时的比电容达到216 F·g-1，10 000次循环后电容保持率为87%。以上性能可归结于：量子点提供了更多的离子吸附位点，且纳米片尺寸减小，缩短了离子传输路径。 | |
| 关键词: 超级电容器 Ti3C2Tx 量子点 水热法 离子传输 | |
| 基金项目: 国家自然科学基金（No.21905206）和上海市青年科技英才扬帆计划（No.19YF1450800）资助。 | |
| Abstract: The restacking of MXene nanosheets resulted in poor ion accessibility to absorption sites, preventing MXene from high energy density and power density. Herein, 0D/2D composite Ti3C2Tx MXene was prepared by hydrothermal method to alleviate the restacking problem. The quantum dot-interspersed Ti3C2Tx nanosheets (QDT) structure was confirmed by X-ray diffraction, dynamic light scattering, and fluorescence spectroscopy. The freestanding film electrodes assembled by QDT showed prominently improved electrochemical properties compared to the pristine Ti3C2Tx nanosheets. In three-electrode system, the mass specific capacitance reached 338 F·g-1 under a scan rate of 5 mV·s-1. The capacitance retention reached 46% as the scan rate was 2 000 mV·s-1. In two-electrode system, the assembled symmetric supercapacitor delivered a discharge capacitance of 216 F·g-1 at a current density of 0.5 A·g-1. The capacitance retention rate was 87% after 10 000 cycles. The above electrochemical properties of QDT film electrodes were ascribed to the increased ion absorption sites from quantum dots and shortened ion pathway resulted from reduced nanosheet sizes. | |
| Keywords: supercapacitor Ti3C2Tx quantum dot hydrothermal method ion transport | |
| 投稿时间：2022-04-13 修订日期：2022-07-09 | |
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| 王晨,刘启航,戚晨阳,王琮钰,赵晓莉,杨晓伟.零维/二维MXene复合膜的制备及其超级电容器性能[J].无机化学学报,2022,38(9):1707-1715. | |
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| Support information: 相关附件： 220177_supporting_information.doc | |
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