fig8
Figure 8. (A) Conceptual schematic diagram of the thermogalvanic hydrogel patch resembling skin for self-powered temperature and strain sensing. Reproduced with permission[131]. Copyright 2024, Springer Nature; (B) A wireless fire monitoring system tracks the real-time voltage change during a fire. Reproduced with permission[132]. Copyright 2020, American Chemical Society. PVA: Polyvinyl alcohol.