Effect of Pb Filling and Synthesis Pressure Regulation on the Thermoelectric Properties of CoSb<sub>3</sub>

Deng, Le; Li, Dongni; Qin, Jieming; Duan, Qian

doi:10.1021/acs.inorgchem.9b00270

Cited by 12 publications

(8 citation statements)

References 25 publications

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“…In addition, some special structures (such as in situ nanostructures [158], dislocation arrays [159,160], nanocrystalline polymer, and lattice distortion [161]) can also be introduced into the CoSb 3 -based materials by the microstructure and composition engineering [158,162], dislocation engineering [159] or grain boundary engineering [160], pressure regulation [161], and novel preparation methods [163][164][165]. The introduction of these special structures can also significantly improve the TE properties of CoSb 3 -based materials.…”

Section: Low Dimensionalmentioning

confidence: 99%

A review of CoSb3-based skutterudite thermoelectric materials

et al. 2020

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The binary skutterudite CoSb3 is a narrow bandgap semiconductor thermoelectric (TE) material with a relatively flat band structure and excellent electrical performance. However, thermal conductivity is very high because of the covalent bond between Co and Sb, resulting in a very low ZT value. Therefore, researchers have been trying to reduce its thermal conductivity by the different optimization methods. In addition, the synergistic optimization of the electrical and thermal transport parameters is also a key to improve the ZT value of CoSb3 material because the electrical and thermal transport parameters of TE materials are closely related to each other by the band structure and scattering mechanism. This review summarizes the main research progress in recent years to reduce the thermal conductivity of CoSb3-based materials at atomic-molecular scale and nano-mesoscopic scale. We also provide a simple summary of achievements made in recent studies on the non-equilibrium preparation technologies of CoSb3-based materials and synergistic optimization of the electrical and thermal transport parameters. In addition, the research progress of CoSb3-based TE devices in recent years is also briefly discussed.

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Section: Low Dimensionalmentioning

confidence: 99%

A review of CoSb3-based skutterudite thermoelectric materials

et al. 2020

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“…Such pressureinduced reduction in grain sizes is observed in various thermoelectric materials [116][117][118][119]. For instance, Deng et al reported that CoSb 3 -based alloys, as shown in figures 5(A) and (B) [120], were synthesized under different pressures (∼GPa), the observation found that the grain sizes exhibited a significant decrease with increasing pressure. The analogous situation occurs in the synthesis of polycrystalline SnSe as well [121], in contrast with the former, the magnitude of pressure is ∼MPa level applied in the preparation process of SnSe, which is far less than ∼GPa level.…”

Section: Microstructural Evolution With Pressurementioning

confidence: 79%

A review of pressure manipulating structure and performance in thermoelectrics

Zhang

Gregory

et al. 2023

J. Phys. D: Appl. Phys.

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Pressure is a fundamental thermodynamic variable that can create exotic materials and modulate transport properties, motivating prosperous progress in multiple fields. As for inorganic thermoelectric materials, pressure is an indispensable condition during a preparation process, which is employed to compress raw powders into the specific shape of solid-state materials for performing properties characterization. In addition to this function, the extra influence of pressure on thermoelectric performance is frequently underestimated and even overlooked. In this review, we summarize recent progress and achievements of pressure-induced structure and performance in thermoelectrics, emphatically involving the modulation of pressure on crystal structure, electrical transport properties, microstructure, and thermal conductivity. According to various studies, the modulated mechanism of pressure on these items above has been discussed in detail, and the perspectives and strategies have been proposed with respect to applying pressure to improve thermoelectric performance. Overall, the purpose of the review is supposed to enrich the understanding of the mechanisms in pressure-induced transport properties and provide a guidance to rationally design a structural pattern to improve thermoelectric performance.

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“…2(d)) with the increase in the Ni doping amount, which might be due to the modification in the crystal structure caused by Ni doping. In addition, the distortion caused by Ni doping may disturb the phonon propagation and reduce the thermal conductivity [38]. Therefore, the Raman scattering spectra also show that the Ni atoms were successfully doped into the p-type skutterudite at the Fe sites.…”

Section: Computational Detailsmentioning

confidence: 99%

Alloying engineering for thermoelectric performance enhancement in p-type skutterudites with synergistic carrier concentration optimization and thermal conductivity reduction

Liu¹,

Wang²,

Yang³

et al. 2023

Journal of Advanced Ceramics

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The enhancements in thermoelectric (TE) performances of p-type skutterudites are usually limited due to the relatively low Seebeck coefficients owing to the higher carrier concentration and more impurity phases induced by inherent structural instability of a Fe-based skutterudite. As shown in this study, alloying engineering of Ni doping at Fe sites in a p-type CeFe 3.8 Co 0.2 Sb 12 skutterudite can not only reduce the impurity phases with high thermal conductivity but also regulate the carrier concentration, and thus significantly increase the Seebeck coefficient. The thermal conductivity was largely suppressed due to the enhanced point defect phonon scattering and decreased hole concentration. As a result, a TE figure of merit ZT of the CeFe 3.5 Ni 0.3 Co 0.2 Sb 12 sample reached 0.8, which is approximately 50% higher than that of a Ni-free sample. Appropriate Ni doping can maintain a high ZT at a high temperature by controlling the reduction in a band gap. Therefore, a high average ZT close to 0.8 at 650-800 K for CeFe 3.5 Ni 0.3 Co 0.2 Sb 12 was obtained, which was comparable to or even higher than those of the reported Ce-filled Fe-based skutterudites due to the synergistic optimization of electrical and thermal performances. This study provides a strategy to synergistically optimize electrical-thermal performances of the p-type skutterudites by alloying engineering.

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Effect of Pb Filling and Synthesis Pressure Regulation on the Thermoelectric Properties of CoSb₃

Cited by 12 publications

References 25 publications

A review of CoSb3-based skutterudite thermoelectric materials

A review of CoSb3-based skutterudite thermoelectric materials

A review of pressure manipulating structure and performance in thermoelectrics

Alloying engineering for thermoelectric performance enhancement in p-type skutterudites with synergistic carrier concentration optimization and thermal conductivity reduction

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Effect of Pb Filling and Synthesis Pressure Regulation on the Thermoelectric Properties of CoSb3

Cited by 12 publications

References 25 publications

A review of CoSb3-based skutterudite thermoelectric materials

A review of CoSb3-based skutterudite thermoelectric materials

A review of pressure manipulating structure and performance in thermoelectrics

Alloying engineering for thermoelectric performance enhancement in p-type skutterudites with synergistic carrier concentration optimization and thermal conductivity reduction

Contact Info

Product

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Effect of Pb Filling and Synthesis Pressure Regulation on the Thermoelectric Properties of CoSb₃