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Liquid-like material to pave way for new thermoelectric devices

Posted: 30 Mar 2012 ?? ?Print Version ?Bookmark and Share

Keywords:thermoelectric? energy source? heating systems?

In the quest for better thermoelectric materials, researchers have identified a liquid-like compound whose properties give it the potential to be even more efficient than traditional thermoelectrics.

The research was led by scientists from the Chinese Academy of Science's Shanghai Institute of Ceramics in collaboration with researchers from Brookhaven National Laboratory and the University of Michigan, as well as from the California Institute of Technology (Caltech). The study entitled "Copper ion liquid-like thermoelectrics," was published in Nature Materials.

Thermoelectric materials convert heat into electricity and vice versa. They have been used to power spacecraft ranging from Apollo to the Curiosity rover now headed for Mars. Recently, however, scientists and engineers have been turning to these materials to use wasted heat as an efficient energy source. An example of wasted heat is heat released from automobiles or industrial machinery.

The researchers have also proposed using these materials to create more efficient heating systems in electric cars or even as new ways to exploit solar power.

In identifying this new type of thermoelectric material, the researchers studied a material made from copper and selenium. Although it is physically a solid, it exhibits liquid-like behaviors due to the way its copper atoms flow through the selenium's crystal lattice.

"It's like a wet sponge," explained Jeff Snyder, a faculty associate in applied physics and materials science in the division of engineering and applied science at Caltech and a member of the research team.

"If you have a sponge with very fine pores in it, it looks and acts like a solid. But inside, the water molecules are diffusing just as fast as they would if they were a regular liquid. That's how I imagine this material works. It has a solid framework of selenium atoms, but the copper atoms are diffusing around as fast as they would in a liquid."

Liquid-like characteristic of

The blue spheres in the diagram represent selenium atoms forming a crystal structure like a liquid. This liquid-like behavior is what gives the selenium-copper material its unique thermoelectric properties.
Source: Caltech, Jeff Snyder, Lance Hayashida.

Other than Synder, the research group also includes Caltech graduate student Tristan Day and other authors of the ,

In addition to Snyder, the research group includes Caltech graduate student Tristan Day. The other authors on the Nature Materials paper, titled "Copper ion liquid-like thermoelectrics," are Huili Liu, Xun Shi, Lidong Chen, Fangfang Xu, Linlin Zhang, and Wenqing Zhang of the Chinese Academy of Science's Shanghai Institute of Ceramics; Qiang Li of Brookhaven National Laboratory; and Citrad Uher of the University of Michigan.

A thermoelectric material generates electricity when there is a temperature difference between one end of the material and the other. For example, if you place a thermoelectric device right next to a heat sourcesay a laptop batterythen the side closest to the battery will be hotter. The electrons in the hot end will diffuse to the cool end, producing an electric current.

A good thermoelectric material must be good at conducting electricity but bad at conducting heat. If it were good at conducting heat, the heat from the hot end would move to the cool end so fast that the whole material would rapidly reach the same temperature. When that happens, the electrons stop flowing.

One way to improve thermoelectric efficiency, then, is to decrease a material's ability to conduct heat. To that end, researchers have been developing thermoelectric materials with a mix of crystalline and amorphous properties, Snyder said. A crystalline atomic structure allows electrons to flow easily, while an amorphous material, such as glass, has a more irregular atomic structure that hinders heat-carrying vibrations from traveling.

These heat-carrying vibrations travel via two types of waves. The first type is a longitudinal or pressure wave, in which the direction of displacementin this case, the jiggling of atomsis the same as the direction of the wave. The second type is a transverse wave, in which the direction of displacement is perpendicular to the direction of the wave, like when you shake a jump rope up and down, resulting in waves that travel horizontally along the rope.

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