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<p>Improved electrical and reduced thermal conductivities are characteristics of desirable thermoelectric compounds. Incorporating nanostructures to Heusler alloys can enhance their performance as a thermoelectric material. The doping impact of annealed multi-walled carbon nanotubes (A-MWNTs) on the thermoelectric performance of half-Heusler alloys is examined and explained. Both NbFeSb-based and TiNiS<i>n-</i>based compounds have been investigated as a <i>p-</i>type and <i>n-</i>type, respectively. Thermal and electronic transport parameters were recorded at temperatures ranging from ambient to 875&#xa0;K. The prepared samples are characterized using XRD, SEM, and EDAX. Utilizing TiNiS<i>n-</i>based samples, a promising figure of merit of 0.63 was obtained. The obtained thermoelectric results demonstrated that compositing the A-MWNTs with <i>n-</i>type compounds exhibited considerable impact on Seebeck coefficient and the electrical conductivity. However, for the <i>p-</i>type alloy, the variations in these thermoelectric parameters were dramatically less. It is hypothesized that the development of annealed carbon tubes as a conducting cluster in the <i>n-</i>type Heusler alloy could be one explanation for this variation. These promising findings will open the way for further research on CNT/Heusler composites as an effective power generation material.</p>

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Thermoelectric Properties of (Nb0.6Ta0.4)0.8Ti0.2FeSb/Carbon Nanotube Composites

  • 期刊论文

  • 发表日期：

    2025年10月28日

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  • E. M. Elsehly,
  • A. El-Khouly,
  • N. G. Chechenin,
  • V. V. Khovaylo,
  • A. M. Adam

摘要

Improved electrical and reduced thermal conductivities are characteristics of desirable thermoelectric compounds. Incorporating nanostructures to Heusler alloys can enhance their performance as a thermoelectric material. The doping impact of annealed multi-walled carbon nanotubes (A-MWNTs) on the thermoelectric performance of half-Heusler alloys is examined and explained. Both NbFeSb-based and TiNiSn-based compounds have been investigated as a p-type and n-type, respectively. Thermal and electronic transport parameters were recorded at temperatures ranging from ambient to 875 K. The prepared samples are characterized using XRD, SEM, and EDAX. Utilizing TiNiSn-based samples, a promising figure of merit of 0.63 was obtained. The obtained thermoelectric results demonstrated that compositing the A-MWNTs with n-type compounds exhibited considerable impact on Seebeck coefficient and the electrical conductivity. However, for the p-type alloy, the variations in these thermoelectric parameters were dramatically less. It is hypothesized that the development of annealed carbon tubes as a conducting cluster in the n-type Heusler alloy could be one explanation for this variation. These promising findings will open the way for further research on CNT/Heusler composites as an effective power generation material.