Science Daily: A new thermoelectric material that is efficient, stable, and environmentally friendly has been discovered


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It is possible to convert waste heat into electricity, which is a promising way to conserve energy and reuse it. Rare metals are used to synthesize commercially available thermoelectric converter devices. These devices are efficient but can be costly and often use toxic materials. These two factors have resulted in converters that are not widely used. The alternative is oxide-based thermoelectric materials. But, the main drawback of these materials is their inability to withstand high temperatures.

A team led by Professor Hiromichi Ohta at the Research Institute for Electronic Science at Hokkaido University has synthesised a barium cobalt oxide thermoelectric converter that is reproducibly stable and efficient at temperatures as high as 600°C. Their results were published in the journal. ACS Applied Materials & Interfaces.

The Seebeck effect drives thermoelectric conversion. When there’s a temperature difference in a conducting metal, an electrical current is produced. The thermoelectric figure is a measure of the merit of thermoelectric conversion. It determines how efficient it can be. ZT. The historical low-power oxide-based converters were known for their high efficiency. ZTHowever, recent research has found that there are many candidates who have high levels of potential. ZTThey were stable at high temperatures, however, it was not well documented.

Hiromichi Okta’s group has been researching layered cobalt-oxide films for more than 20 years. The team wanted to determine the chemical and thermal stability of these films as well as their measurement. ZTAt high temperatures, values. They tested cobalt dioxide films layered with sodium and calcium, strontium, or barium. Then, they analysed their structure as well as resistivity and thermal conductivity.

They found that, of the four variants, the barium cobalt oxide layered film retained its stability in terms of structural integrity and electrical resistivity at temperatures as high as 600°C. In comparison, the sodium- and calcium cobalt oxide films were only stable until 350°C, and the strontium cobalt oxide film was stable up to 450°C. The ZT of the barium cobalt oxide film increased with the temperature, reaching ~0.55 at 600°C, comparable to some commercially available thermoelectric converters.

Hiromichi Okta said, “Our study has shown barium cobalt oxide film would be an excellent candidate for high-temperature thermoelectric converter devices.” These films are also environmentally friendly and could be used in wide range of applications.


MaterialsProvided by Hokkaido University. Notice: Style and length may be changed.


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