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<p>Half-Heusler (HH) compounds are medium-to-high-temperature thermoelectric materials that exhibit excellent thermoelectric performance. However, their high lattice thermal conductivities (<i>κ</i><sub>l</sub>) limit industrial applications. Previous studies have successfully reduced <i>κ</i><sub>l</sub> through solid solution and grain refinement techniques. Nonetheless, a disparity persists between the experimental and theoretically calculated limits. In this study, we aimed to decrease <i>κ</i><sub>l</sub> and increase the thermoelectric figure-of-merit (<i>ZT</i>) value by incorporating carbon nanotubes (CNTs) as phonon scattering centers into the HH alloy system. The creation of noncoherent boundaries between CNTs and ZrNiSn compounds effectively scatters phonons and reduces <i>κ</i><sub>l</sub>. Moreover, the electrical conductivity was simultaneously optimized by compositing with CNTs. Overall, an enhanced <i>ZT</i> of 0.67 for 4&#xa0;wt.% CNTs/ZrNiSn was achieved at 923&#xa0;K, which is nearly a 21% improvement compared to that of pristine ZrNiSn. Furthermore, the microhardness and Young’s modulus in CNTs/ZrNiSn materials are substantially improved upon increasing the CNT content, far exceeding those in other conventional thermoelectric materials. This study paves the way for optimizing thermoelectric performance by hybridizing CNTs and HH materials at the nanometer scale.</p>

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Thermoelectric Properties of N-type ZrNiSn-Based Alloys with Carbon Nanotubes Incorporation

  • 期刊论文

  • 发表日期：

    2025年7月3日

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  • Xiong Yang,
  • Ruonan Min,
  • Yan Liu,
  • Yingbo Zhang,
  • Hui Chen

摘要

Half-Heusler (HH) compounds are medium-to-high-temperature thermoelectric materials that exhibit excellent thermoelectric performance. However, their high lattice thermal conductivities (κl) limit industrial applications. Previous studies have successfully reduced κl through solid solution and grain refinement techniques. Nonetheless, a disparity persists between the experimental and theoretically calculated limits. In this study, we aimed to decrease κl and increase the thermoelectric figure-of-merit (ZT) value by incorporating carbon nanotubes (CNTs) as phonon scattering centers into the HH alloy system. The creation of noncoherent boundaries between CNTs and ZrNiSn compounds effectively scatters phonons and reduces κl. Moreover, the electrical conductivity was simultaneously optimized by compositing with CNTs. Overall, an enhanced ZT of 0.67 for 4 wt.% CNTs/ZrNiSn was achieved at 923 K, which is nearly a 21% improvement compared to that of pristine ZrNiSn. Furthermore, the microhardness and Young’s modulus in CNTs/ZrNiSn materials are substantially improved upon increasing the CNT content, far exceeding those in other conventional thermoelectric materials. This study paves the way for optimizing thermoelectric performance by hybridizing CNTs and HH materials at the nanometer scale.