Conformal shape‐adaptive wireless charging supercapacitors for wearable devices

Abstract Flexible wireless charging energy storage devices enable simultaneous energy harvesting and storage in a fully untethered manner, offering promising solutions for next‐generation wearable electronics. Herein, we develop a conformal and shape‐adaptive all‐MXene‐printed flexible wireless charging supercapacitor on an ultra‐thin polyethylene (PE) substrate. The device seamlessly integrates wireless charging coils (WCCs) and micro‐supercapacitors (MSCs) via high‐precision direct ink writing, enabling dynamic deformation and intimate contact with arbitrarily curved surfaces without compromising electrical performance. The unique circuit architecture achieves a wireless power transfer efficiency of 57.1%. The MSCs deliver an areal capacitance of 66.18 mF cm −2 at 0.1 mA cm −2 and a high energy density of 29.7 μWh cm −2 at a power density of 70 μW cm −2 . After only 6 min of wireless charging, the integrated device outputs 1.51 mW of power‐sufficient to illuminate an LED. The conformal shape‐adaptive design not only enhances mechanical adaptability and user comfort in wearable systems but also ensures reliable energy storage under real‐world deformation scenarios. This work provides a versatile platform for the design of multifunctional, seamlessly integrated, and self‐powered energy modules tailored for future wearable electronics.