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Nano energy v.31, 2017년, pp.152 - 159   SCIE
본 등재정보는 저널의 등재정보를 참고하여 보여주는 베타서비스로 정확한 논문의 등재여부는 등재기관에 확인하시기 바랍니다.

Nano-micro-porous skutterudites with 100% enhancement in ZT for high performance thermoelectricity

Khan, Atta U. (National Institute for Materials Science (NIMS), International Center for Materials Nanoarchitechtonics (MANA), Namiki 1-1, Tsukuba 305-0044, Japan ); Kobayashi, Kazuaki (National Institute for Materials Science (NIMS), International Center for Materials Nanoarchitechtonics (MANA), Namiki 1-1, Tsukuba 305-0044, Japan ); Tang, Dai-Ming (National Institute for Materials Science (NIMS), International Center for Materials Nanoarchitechtonics (MANA), Namiki 1-1, Tsukuba 305-0044, Japan ); Yamauchi, Yusuke (National Institute for Materials Science (NIMS), International Center for Materials Nanoarchitechtonics (MANA), Namiki 1-1, Tsukuba 305-0044, Japan ); Hasegawa, Kotone (National Institute for Materials Science (NIMS), International Center for Materials Nanoarchitechtonics (MANA), Namiki 1-1, Tsukuba 305-0044, Japan ); Mitome, Masanori (National Institute for Materials Science (NIMS), International Center for Materials Nanoarchitechtonics (MANA), Namiki 1-1, Tsukuba 305-0044, Japan ); Xue, Yanming (National Institute for Materials Science (NIMS), International Center for Materials Nanoarchitechton ); Jiang, Baozhen ( ); Tsuchiya, Koichi ( ); Golberg, Dmitri ( ); Bando, Yoshio ( ); Mori, Takao ( );
  • 초록  

    Abstract Increasing energy demands require new materials, e.g., thermoelectrics, for efficient energy conversion of fossil fuels. However, their low figure of merit (ZT) limits widespread applications. Nanostructuring has been an effective way of lowering the thermal conductivity. However, grain growth at elevated temperature is still a big concern, for otherwise expected to be long-lasting thermoelectric generators. Here, we report a porous architecture containing nano- to micrometer size irregularly shaped and randomly oriented pores, scattering a wide spectrum of phonons without employing the conventional rattling phenomenon. Lattice thermal conductivity reaches the phonon glass limit. This design yields >100% enhancement in ZT, as compared to the pristine sample. An unprecedented and very promising ZT of 1.6 is obtained for Co23.4Sb69.1Si1.5Te6.0 alloy, by far the highest ZT ever reported for un-filled skutterudites, with further benefits, i.e. rare-earth-free and improved oxidation resistance enabling simple processing. Highlights Micro/nanostructures in thermoelectric skutterudite were induced through evaporation. These micro and nano pores strongly achieve phonon selective scattering. Unique design gives rise to unprecedented high ZT=1.6 for filler-free skutterudites. Graphical abstract [DISPLAY OMISSION]


  • 주제어

    Energy conversion .   Materials science .   Semiconductors .   Solid-state chemistry .   Thermoelectric materials.  

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