Conductive Hydrogels as Next‐Generation Materials for Flexible and Wearable Electronic Systems

ABSTRACT Conductive hydrogels (CHs) have emerged as a promising class of multifunctional materials that integrate the softness, stretchability, and high water content of traditional hydrogels with the electrical conductivity essential for modern electronic applications. Their unique ability to conform to dynamic biological interfaces while maintaining stable electrochemical performance makes them ideal candidates for next‐generation flexible and wearable devices. This review provides a comprehensive and critical analysis of the recent progress in CH development, focusing on the design strategies, synthesis routes, and structural innovations that enhance their electrical, mechanical, and environmental performance. Various types of conductive elements, including metallic nanostructures, carbon‐based nanomaterials, ionic species, and intrinsically conducting polymers are discussed in the context of hybrid network formation and charge transport mechanisms. Special attention is given to the multifunctional properties of CHs, such as antifreezing behavior, self‐healing capability, tissue adhesion, and long‐term stability, which are pivotal for real‐world deployment. Application‐driven sections explore the role of CHs in wearable strain sensors, energy storage systems, and triboelectric nanogenerators, highlighting state‐of‐the‐art device performance and integration strategies. Finally, current challenges and future perspectives are outlined, emphasizing the need for scalable fabrication methods, sustainable material systems, and intelligent functionalities. This review aims to guide interdisciplinary efforts in advancing CHs as transformative materials for soft electronics, bio‐integrated technologies, and adaptive human–machine interfaces.