Thermoelectric materials can use thermal differences to generate electricity. Now there is an inexpensive and environmentally friendly way of producing them with the simplest of components: a normal pencil, photocopy paper, and conductive paint are sufficient to convert a temperature difference into electricity via the thermoelectric effect.
from Engineering and Construction News – ScienceDaily https://www.sciencedaily.com/releases/2018/02/180216110520.htm
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