Riveted Interconnections of Capacitance-Matched MXene-Based Yarn Supercapacitors Enable Seamless Energy Integration in Textiles.

Electronic textiles are a transformative technology set to revolutionize next-generation wearable devices. However, a major challenge is making efficient yarn-based energy systems that power flexible wearables while blending seamlessly into textiles for unobstructed applications. Herein, 2D materials-coated yarn supercapacitors (YSCs) are designed, offering a promising solution through capacitance-matched electrode fabrication and a novel customizable riveted interconnection strategy for textile integration. MXene-coated cotton yarns (negative electrode) achieve a remarkable specific capacitance of ≈7 360 mF cm (≈536 F g). To complement the negative electrode, a positive yarn electrode (rGO/MoS) is developed through a tailored synthesis process. A device fabrication strategy based on matching the capacitance of the yarn electrodes enhances the performance of YSCs, achieving an impressive specific capacitance of ≈658 mF cm (≈53 F g), power density of ≈8,147 μW cm (≈650 W kg), and energy density of ≈154.5 μWh cm (≈12.3 Wh kg). The practical applicability of the YSCs is demonstrated via a novel yet simple integration design, whereby YSCs are connected to conductive rivets, which serve as buttons capable of toggling charge/discharge and easy removal from clothes for washing. The advancements made in this work enable on-the-go powering of wearable health systems, displays, and the Internet of things.