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ENERGIX-Stort program energi

Nanostructured materials for thermoelectric conversion of waste heat into electricity

Tildelt: kr 8,8 mill.

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Waste heat is a huge and growing part of the global energy challenge. If only a small fraction of the domestic and industrial low-grade thermal waste could be utilized, it would give a tremendous contribution to the overall energy balance and fight carbon dioxide emissions. Thermoelectricity represents a very attractive and promising path towards efficient and safe exploitation of this resource. Obvious benefits of thermoelectric (TE) devices include their compact and highly scalable design, with no movin g parts and virtually no need for maintenance. The current project aims to bring a new generation of TE materials up to the stage of demonstrating their performance in a prototype device. This generation relies on nanostructured materials which exhibit pr onounced decrease in their thermal conductivity parallel to an optimized carrier concentration, thus reducing heat loss without sacrificing electronic performance. This will be achieved with a nanosized network of grains and atomic substitutions, pressed into pellets from very fine powder. We will use a newly purchased cryogenic mill to reduce the powder size into the nano range and at the same time incorporate substituting elements to align the carrier concentration for maximized performance; this gives the opportunity to synthesize compounds with optimized bulk pro¬perties without decomposition or sintering during milling. The resulting materials will be used to construct a TE prototype device based on non-toxic and abundant materials.

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ENERGIX-Stort program energi