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Nanoporous PbSe-SiO2 Thermoelectric Composites.

Chao-Feng Wu1, Tian-Ran Wei1, Fu-Hua Sun1

  • 1State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 P. R. China.

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Summary

Creating nanoporous lead selenide-silica (PbSe-SiO2) composites via mechanical alloying and spark plasma sintering significantly boosts thermoelectric performance. This approach lowers thermal conductivity and enhances the figure of merit (ZT) for efficient energy conversion.

Keywords:
mechanical alloyingnanoporous structuresthermoelectric composites

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Thermoelectrics

Background:

  • Nanoporous structures are theoretically effective for reducing thermal conductivity in thermoelectric materials.
  • Practical fabrication of nanoporous thermoelectric materials faces technical challenges.
  • Previous research focused on nanoscale precipitates rather than nanoporosity for thermal management.

Purpose of the Study:

  • To investigate the fabrication of nanoporous PbSe-SiO2 composites.
  • To evaluate the thermoelectric properties of these composites, focusing on thermal conductivity and figure of merit (ZT).
  • To demonstrate the potential of nanoporous architecture for enhancing thermoelectric conversion efficiency.

Main Methods:

  • Fabrication of PbSe-SiO2 composites using mechanical alloying, wet-milling, and spark plasma sintering.
  • Characterization of the resulting nanoporous structure and its effect on thermal conductivity.
  • Analysis of electrical transport properties and temperature-dependent scattering mechanisms.

Main Results:

  • Achieved a low lattice thermal conductivity of 0.56 W m^-1 K^-1 above 600 K due to random nanopores and interface scattering.
  • Observed grain-boundary potential barrier scattering dominating room-temperature electrical transport, diminishing at higher temperatures.
  • Obtained a maximum figure of merit (ZT) of 1.15 at 823 K for PbSe + 0.7 vol% SiO2 composite.
  • Demonstrated a >20% increase in average ZT compared to non-nanoporous counterparts.

Conclusions:

  • Nanoporous structuring is a viable and effective strategy for enhancing thermoelectric materials.
  • The facile fabrication method enables the creation of high-performance thermoelectric composites.
  • The study highlights the significant potential of nanoporous PbSe-SiO2 for efficient thermoelectric energy conversion.