关键词: 纤维电极, 电化学沉积, 纤维超级电容器, 聚苯胺, 碳纳米管, 复合纤维

Abstract:

In order to prepare portable, one-dimensional fiber supercapacitors with required electrochemical properties, composite fibers were prepared as electrode substrates using the liquid crystal state of carbon nanotubes (CNT) and MXene (Ti₃C₂T_x) synergistically. A simple and controllable electrochemical deposition method was applied to deposit polyaniline (PANI) on the fiber surface to prepare composite fiber electrodes. Microscopic morphological characterization and electrochemical performance tests were performed on the fibers to obtain the electrode with the optimal deposition time and assemble the fiber supercapacitor. The result shows that the PANI/Ti₃C₂T_x/CNT fiber electrode exhibits the highest bulk specific capacitance of 113.92 F/cm³ at a scan rate of 5 mV/s when deposited for 5 min. The specific capacitance of the assembled supercapacitor reached 65.4 F/cm³ at a current density of 0.1 A/cm³. The retention rate of the specific capacitance is 79% after 5 000 cycles at 0.8 A/cm³, indicating good stability.

Key words: fiber electrode, electrochemical deposition, fiber supercapacitor, polyaniline, carbon nanotube, composite fiber