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Thermoelectric generator using human heat

19.02.2013

Fujifilm has introduced a high-performance thermoelectric converter based on organic materials. The new thermoelectric generator opens up wide opportunities for autonomous power supply of promising mobile devices with low power consumption.

The dimensionless coefficient of performance (ZT) of the new thermoelectric generator is 0,27, but Fujifilm claims that the actual performance is higher. At an exhibition recently held in Tokyo, a prototype thermoelectric converter demonstrated a power of several milliwatts. At the same time, the novelty can generate electricity even from a temperature difference of 1 degree Celsius.

Fujifilm does not disclose details about the manufacturing technology and composition of the organic material from which the new type of thermoelectric generator is made. It is only noted that it was created on the basis of the developments of the Japanese AIST Institute. Specialists from this institution in 2011 developed a technology for printing thermoelectric devices on flexible substrates such as plastic films and paper. In this case, a composite material was used, consisting of carbon sputtered on a polymer matrix. This material, made at the nanoscale, is capable of generating 1,5 times more power than conventional printed counterparts. So, during the experiments, the difference between the temperature of the hand and the temperature in the room (36 and 25 degrees Celsius, respectively) made it possible to generate a current with a voltage of 108,9 mV.

Fujifilm hopes that the new thermoelectric technology will power various sensors placed on the human body, including medical and environmental sensors. In addition, low-cost organic thermoelectric modules can be used to improve the efficiency of solar panels, vehicles, mobile device charging and low-power automation.

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The idea arose by chance. American chemist Craig Arnold was sitting at a dinner meeting of colleagues at Princeton University and began to examine the bread in his sandwich.

Then he thought that the structure of this bread could be used in an airgel to filter water. Arnold and his assistants then began experimenting with bread recipes with extra carbon.

The first samples of airgels did not have the necessary durability. Then the experiments continued with individual ingredients. And finally, there was an unexpected discovery: egg white with a little added carbon showed the necessary results.

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