A Monolithically Integrated MXene‐Printed Hybrid Energy System for Wireless Self‐Powered Microelectronics

Abstract Reliable and sustainable energy supply remains a critical challenge in wearable and implantable microelectronics. Although hybrid energy strategies show promise, most existing systems rely on stacked, multi‐component designs, hindering integration and scalability. Here, a fully printed, monolithically integrated MXene‐based system combining active wireless charging and passive energy harvesting is demonstrated. The system features an MXene‐printed coil that delivers a stable 3 V wireless output and achieves up to 0.67 mW under self‐powered operation. Integrated MXene micro‐supercapacitors (MSCs) ensure effective voltage regulation and energy storage. Additionally, an MXene‐printed humidity sensor is integrated, highlighting the platform's expandability for real‐time sensing. The entire system is fabricated on flexible substrates via a streamlined, room‐temperature MXene direct printing process without complex post‐processing, providing a compact and scalable energy solution for untethered, self‐sustained microelectronics.