Chip converts heat to electricty

(It's back in the news! The last time I heard of this is around 2010.)

An engine with no moving parts that converts heat to electricity with over 40 per cent efficiency has been developed by MIT engineers. The heat engine is a thermophotovoltaic (TPV) cell, similar to a solar panel’s photovoltaic cells. The team’s design can generate electricity from a heat source at between 1,900°C and 2,400°C and can hopefully be incorporated into a grid-scale thermal battery. https://eandt.theiet.org/content/articles/2022/04/solid-state-engine-efficiently-converts-heat-to-electricity/

Since the temperature requirements are so high, this is impractical to harvest excess heat from the home. However, an device to change 100F heat to electricity sure would be helpful, at least to slow charge small devices.

From 2019: "Power Generation Using Solid-State Heat Engines". https://link.springer.com/chapter/10.1007/978-3-030-19951-7_6