Stretchable and Freeze‐Tolerant Organohydrogel Thermocells with Enhanced Thermoelectric Performance Continually Working at Subzero Temperatures

Aqueous thermocells that are eco‐friendly and capable of converting low‐grade heat into electricity continuously are promising candidates to power flexible and wearable devices in various application scenarios. However, challenges remain in their limited working temperatures, mechanical fragility, and poor thermoelectric performance, mainly due to the reduced entropy of both polymer chains and thermogalvanic ions at low temperatures. In this...