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Seminar Pr. Takao Mori "Utilizing Nanotechnology, Magnetism, and Novel Materials to Develop Viable Thermoelectric Materials"

Invited seminar : Pr. Takao Mori (National Institute for Materials Science (NIMS), Tsukuba, Japan)

Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Japan

"Utilizing Nanotechnology, Magnetism, and Novel Materials to Develop Viable Thermoelectric Materials"

Room 43-44 317 campus Jussieu - 24/07/2019 de 11h-12h

Approximately 2/3 of all primary energy (oil, natural gas, etc.) consumed by mankind, turns out to be unutilized, with much of the waste being heat. The direct conversion of waste heat to electricity is a large incentive to find viable thermoelectric (TE) materials. And not just for the energy saving, but energy harvesting to power IoT sensors are also applications of extreme high interest now.[1] ​There are paradoxes to overcome in the requirements of thermoelectric high performance (figure of merit ZT = α2σ​T/κ, where α is the Seebeck coefficient, σ is electrical conductivity, κ is thermal conductivity) which deal with fundamental nature of electronic and thermal transport.[2] Nanostructuring has been found as a way to selectively scatter phonons (heat),[3] and recently we have discovered that introducing controlled amounts of nano-microporosity can significantly enhance the properties, leading to 100% enhancement for example in rare earth-free skutterudites to ZT~1.6.[4] Furthermore, we have proposed to utilize magnetic interactions between carriers and magnetic moments to overcome the conventional tradeoff between electrical conductivity σ​ and Seebeck coefficient α to enhance the power factor α2σ​.[5] We have also recently experimentally demonstrated significant enhancement of the Seebeck coefficient via spin fluctuation.[6] Support from CREST, JST is acknowledged.

References [1]​T. Mori and S. Priya, MRS Bulletin, 43, 176 (2018), I. Petsagkourakis, et al., Sci. Tech. Adv. Mater., 19, 836 (2018). [2]​T. Mori, Small, 13, 1702013 (2017). [3] Thermoelectric Nanomaterials, ed. K. Koumoto and T. Mori, (Springer, Heidelberg, 2013) pp. 1-373. [4] A. U. Khan et al., Nano Energy, 31, 152 (2017). [5] Angew. Chem. Int. Ed., 54, 12909 (2015), Mater. Today Phys., 3, 85 (2017), Chem. Mater., 29, 2988 (2017), Inorg. Chem., 57, 5258 (2018), A. Fahim (PhD student), et al., J. Mater. Chem. A 5, 7545 (2017), Mater. Today Phys., 9, 100090 (2019). [6] N. Tsujii, et al., Science Advances 5, eaat5935 (2019).


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