Abstract: Textile-based flexible electrodes are widely used in flexible sensing, human-computer interaction, and health detection due to their excellent flexibility, high pore density, and low cost. However, due to the electrically insulating nature of traditional textiles, it is often necessary to use methods such as dipping, spraying, and electrodeposition to make the textile electrically conductive; the conductive materials in these flexible electrodes are prone to detachment during bending and folding. In addition, the electrode material is susceptible to water infiltration in the environment during use, which in turn affects the electrical stability of the material. Therefore, the Janus interface constructed on the surface of the electrode material can achieve waterproof and moisture-permeable performance of the electrode surface.
To construct the Janus interface on the fabric electrode surface to enhance the waterproof and moisture permeability of the electrode, and the stability of the active substance adhesion on the fabric electrode surface, carbon black was electrostatically self-assembled onto the surface of PEI-modified polyester, and then polymerization of polypyrrole on the surface of the carbon coating was used to prepare carbon /polypyrrole/polyester conductive materials; polydimethylsiloxane (PDMS) was used to hydrophobize the conductive fibers and construct the Janus membrane to make the electrode waterproof and self-cleaning. Moreover, PDMS can be used as a curing agent to enhance the adhesion between the conductive material and polyester fibers, preventing the conductive material and the active material from falling off in the state of folding, bending, and twisting. The prepared samples passed a series of tests, and the results showed that: the constructed hydrophobic coating can effectively resist the interference of external liquid droplets, and the static contact angle of water droplets was 151.73°; the Janus structure can effectively increase the infiltration rate of the hydrophilic side, and 8 μL of deionized water was completely absorbed within 1.6 s; due to the solidification of active substances by PDMS, the capacity retention rate of the flexible electrode after 1,000 cycles of bending was 98.4%; the composite coating of carbon black and polypyrrole increased the area-specific capacitance of the flexible electrode to 1,037 mF/cm² (at a current density of 1 mA/cm²); the area specific capacitance retention rate was 96.6% after 4,000 cycles of cyclic charging and discharging. The composite structure design of the superhydrophobic coating and polypyrrole/carbon black exhibits complementary gain effects, providing a material basis for the research of lightweight and high-performance flexible wearable devices and energy storage devices. The constructed Janus electrode with its hydrophobic surface possesses high surface energy, which can accelerate the wetting performance of the hydrophilic surface and enhance the electrochemical reaction rate. 
Through a series of tests and characterizations, it is proved that the prepared unilateral superhydrophobic electrodes have excellent performance in terms of wettability, flexibility, electrochemical performance, and cycling performance, which provides a new idea for the research of lightweight, high-performance, and low-cost flexible electronic energy storage devices.

Key words: polyester fabric, carbon black, polypyrrole, Janus superhydrophobic, flexible electrode

摘要： 纺织基电极材料作为储能及智能器件的关键组成部分，其防水、透湿功能是实现材料抵御环境水浸润及高效电化学性能的重要条件。文章以涤纶纺织品为基底材料，负载炭黑、聚吡咯导电复合涂层，构筑了高性能柔性电极；接着在电极单侧喷涂聚二甲基硅氧烷(PDMS)溶液，制备出柔性Janus超疏水电极。研究表明：导电涂层与超疏水涂层能够均匀地粘附在纤维表面；在浸润性测试中，电极经PDMS处理后电极表面水的接触角为151.73°，展现出超疏水性，未经PDMS处理面，液滴在1.6 s内完全浸润；在电化学性能测试中，当恒流充放电电流密度为1 mA/cm2时，Janus超疏水电极的面积比电容可达1037 mF/cm2，经1000次弯折后容量保持率仍为98.4%，循环充放电4000次后，其面积比电容保持率高达96.6%，展现出良好的电容性能及稳定性。柔性Janus超疏水电极的制备可为高性能、低成本的柔性产品的开发奠定材料基础。

关键词: 涤纶织物, 炭黑, 聚吡咯, Janus超疏水, 柔性电极