An Osaka University research team has created a thermoelectric material with promising performance at room temperature. The non-toxic, room-temperature thermoelectric material is competitive with conventional bismuth telluride, and could be used for power generation or refrigeration.

Thermoelectric (TE) materials could play a key role in future technologies. Although the applications of these remarkable compounds have long been explored, they are mostly limited to high-temperature devices.

(a) Three-dimensional crystal structure of YbSi2, (b) view along the a-axis, and (c) along the c-axis. Image Credit: Kurosaki et al, Osaka University. Click image for the largest view.

Using ytterbium silicide because it is a good electrical conductor that also has a high Seebeck coefficient thanks to Kondo resonance (fluctuation of f-electrons) increases its power factor. Its layered structure further promotes the thermoelectric effect by blocking heat conduction.

Their study, published in Physica Status Solidi RRL, could help bring these materials out of the high-temperature niche and into the mainstream.

TE materials display the thermoelectric effect: apply heat on one side, and an electric current starts to flow. Conversely, run an external current through the device, and a temperature gradient forms; i.e., one side becomes hotter than the other. By interconverting heat and electricity, TE materials can be used as either power generators (given a heat source) or refrigerators (given a power supply).

The ideal TE material combines high electrical conductivity, allowing the current to flow, with low thermal conductivity, which prevents the temperature gradient from evening out. The power generation performance mainly depends on the “power factor,” which is proportional to both electrical conductivity and a term called the Seebeck coefficient.

Study co-author Sora-at Tanusilp explained, “Unfortunately, most TE materials are often based on rare or toxic elements. To address this, we combined silicon – which is common in TE materials – with ytterbium, to create ytterbium silicide [YbSi2]. We chose ytterbium over other metals for several reasons. First, its compounds are good electrical conductors. Second, YbSi2 is non-toxic. Moreover, this compound has a specific property called valence fluctuation that make it a good TE material at low temperatures.”

The first advantage of YbSi2 is that the Yb atoms occupy a mixture of valence states, both +2 and +3. This fluctuation, also known as Kondo resonance, increases the Seebeck coefficient with keeping metal-like high electrical conductivity at low temperature, and therefore the power factor.

Second, YbSi2 has an unusual layered structure. While the Yb atoms occupy crystal planes similar to pure Yb metal, the Si atoms form hexagonal sheets between those planes, resembling the carbon sheets in graphite. This blocks the conduction of heat through the material, and therefore keeps the thermal conductivity down, preserving the temperature gradient. The researchers believe that heat conduction is further suppressed by controlling the structure in nanoscale and traces of impurities and other defects.

The result is an encouragingly high power factor of 2.2 mWm-1K-2 at room temperature. This is competitive with conventional TE materials based on bismuth telluride. As corresponding author of this study Ken Kurosaki explains, “The use of Yb shows we can reconcile the conflicting needs of TE materials through carefully selecting the right metals. Room-temperature TEs, with moderate power, can be seen as complementary to the conventional high-temperature, high-power devices. This could help unlock the benefits of TE in everyday technology.”

This is exceptionally interesting news. Thermoelectric devices could be the first real big step into salvaging energy lost as heat and returning the energy back for use. Heat loss is by far the single most energy wasting event in using energy. Working at room temperatures is huge improvement and gets the potential into the range of real markets. Congratulations are in order, lets hope this technology can scale up!


3 Comments so far

  1. Martha M. Mayhew on January 2, 2018 3:24 AM

    Working at room temperatures is huge improvement and gets the potential into the range of real markets.

  2. Shayma Rafif Kattan on January 2, 2018 4:02 AM

    Congratulations are in order, lets hope this technology can scale up!

  3. Miller on January 3, 2018 1:04 AM

    Awesome research.We should support it more.

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