fig7

Figure 7. (A) Demonstration of thermoelectric system in powering electronic devices. Reproduced with permission^[83]. Copyright 2023, Elsevier B.V; (B) A hydrogel thermocell on a mobile phone battery is demonstrated to achieve effective evaporative cooling while converting the waste heat into electrical energy. Reproduced with permission^[127]. Copyright 2020, American Chemical Society. TEG: Thermoelectric generator; TG: thermogravimetric.