ABSTRACT Supramolecular hydrogels capable of integrating mechanical robustness, strong adhesion, and reliable energy conversion remain highly sought for next‐generation soft electronics. Here, we present a transparent, ultra‐stretchable ionic hydrogel constructed through synergistic host–guest interaction, hydrogen bonding, and electrostatic interactions. The dynamic network exhibits outstanding mechanical performance (2173% strain, 340 kPa strength, 2.88 MJ m − 3 toughness), rapid self‐healing, broad‐substrate adhesion, and potent antibacterial activity. The hydrogel functions as a sensitive strain sensor with stable, multimodal motion detection. It further serves as an efficient electrode for both triboelectric and droplet‐based energy harvesting, powering commercial LEDs. Notably, the material exhibits a high p‐type ionic thermoelectric response, achieving a Seebeck coefficient of 2.95 mV K − 1 and scalable thermovoltage output up to 14.3 mV/K in modular ionic thermoelectric capacitors. This work provides a versatile materials platform toward integrated soft electronics with simultaneous mechanical, sensing, and energy harvesting functionalities.
Wang et al. (Sat,) studied this question.