Fujifilm has developed a thermoelectric material that will generate 1kw of electricity with a temperature difference of only 1 degree C. Peltier devices, available on Amazon and Ebay, can also generate electricity but generally require a thermal gradient of 100 degrees F or more to get 4-5 volts DC, and not that many milliamps.
I want one!
More thermoelectric gadgets on the market at Pinterest.
Info on a Tin-Selenide TE material.
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