Robust Reduced Graphene Oxide/Polyaniline/MXene Decorated Cotton Yarn for Flexible One-Dimensional Supercapacitors

The development of yarn-shaped supercapacitors (YSCs) with high electrochemical performance and large mechanical property is crucial for portable, self-powered electronics. In this work, rGO/MXene/polyaniline (PANI) decorated cotton (GMPC) yarn was fabricated via dip-coating method followed by chemical reduction process. Benefiting from the intrinsic conductivity of active components and stable heterogeneous interface interaction via hydrogen bond, the GMPC yarn forms a continuous pathway causing fast electron transfer. Moreover, intercalating PANI nanoparticles between two-dimensional architectures can not only provide abundant active sites for ion adsorption, but also impede the self-restacking effect of rGO and MXene, leading to a porous structure and good electrolyte diffusion kinetics. Besides, the cotton yarn establishes a robust and flexible skeleton, endowing excellent mechanical performance. As a result, the designed GMPC yarn presents high capacitance of 406.7 F g ^− 1 at current density of 1 A g ^− 1 , outstanding rate performance (138.9 F g ^− 1 at 10 A g ^− 1 ) and excellent long-term cycling property (87.8% capacitance retention after 5000 times cycles). More importantly, the assembled symmetric YSCs also illustrates favorable energy density of 2.25 Wh kg ^− 1 and good electrochemical performance after various deformations, demonstrating the potential for advanced energy storage applications.