Devices that convert heat into electricity. Generate electricity from your daily life

Many electrical and mechanical devices, such as car engines, produce heat as a byproduct of their normal operation. It’s called “waste heat,”  But a growing area of research called solid-state thermoelectrics aims to capture that waste heat inside specially designed materials to generate power and increase overall energy efficiency.

https://www.sciencedaily.com/releases/2016/12/161222130528.htm