Enhanced thermoelectric performance of BiSbTe alloy: Energy filtering effect of nanoprecipitates and the effect of SiC nanoparticles

De, Zhang; Lei, Jingdan; Guan, Weibao; Ma, Zheng; Wang, Chao; Zhang, Lijuan; Cheng, Zhenxiang; Wang, Yuanxu

doi:10.1016/j.jallcom.2019.01.084

Cited by 39 publications

(26 citation statements)

References 43 publications

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“…Intriguingly, the mobility improved after nano-SiC dispersion, contributing to the increase in electrical conductivity. This phenomenon was also discussed in a previous report [31]. Generally, the structure, carrier concentration, and effective mass affect mobility.…”

Section: Resultssupporting

confidence: 66%

“…Intuitively, nanoparticles with an appropriate size should have a stronger and more beneficial effect on the TE performance. On the other hand, because the TE properties are sensitive to material compositions [31,32], a fixed matrix composition is favorable for investigating the effect of the nanoparticle size on the TE properties. SiC has a wide band gap and low cost, and ultrafine SiC particles can be easily obtained.…”

Section: Introductionmentioning

confidence: 99%

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(Bi,Sb)2Te3/SiC nanocomposites with enhanced thermoelectric performance: Effect of SiC nanoparticle size and compositional modulation

et al. 2021

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Fabrication of nanoparticle-dispersed composites is an effective strategy for enhancing the performance of thermoelectric materials, and in particular SiC nanoparticles have been often used to create composites with Bi 2 Te 3 -based applied thermoelectric materials. However, the effect of particle size on the thermoelectric performance is unclear. This work systematically investigated the electrical and thermal properties of a series of (Bi,Sb) 2 Te 3 -based nanocomposites containing dispersed SiC nanoparticles of different sizes. It was found that particle size has a significant impact on the electrical properties with smaller SiC nanoparticles giving rise to higher electrical conductivity. Even though the dispersed SiC nanoparticles enhanced the Seebeck coefficient, no apparent dependence of the enhancement on the particle size was observed. It was also found that smaller SiC nanoparticles scatter phonons to some extent while the larger nanoparticles contribute to increased thermal conductivity. Eventually, the highest ZT value of 1.12 was obtained in 30 nm-SiC dispersed sample, corresponding to an increase by 18% from 0.95 for the matrix made from commercial scraps, and then the ZT was further boosted to 1.33 by optimizing the matrix composition and expelling excess Te during the optimized spark plasma sintering process. This work proves that the dispersion of smaller SiC nanoparticles in p-type (Bi,Sb) 2 Te 3 materials is more effective than the dispersion of larger nanoparticles. In addition, it is revealed that additional compositional and/or processing optimization is vital and effective for obtaining further performance enhancement for nanocomposites of SiC nanoparticles dispersed in (Bi,Sb) 2 Te 3 .

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Section: Resultssupporting

confidence: 66%

Section: Introductionmentioning

confidence: 99%

(Bi,Sb)2Te3/SiC nanocomposites with enhanced thermoelectric performance: Effect of SiC nanoparticle size and compositional modulation

et al. 2021

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“…As a result, there was a decrease in the n while the SiC nanoparticles enhanced the mean carrier energy, so altering the DOS and enhancing S up to 255 μVK −1 at room temperature. They reported a high ZT of 1.45 at 325 K and a reduced κ t of about 0.33 Wm −1 K −1 for 0.2 wt% SiC nanoparticles …”

Section: Optimization Techniques To Enhance the Zt Of Te Materialsmentioning

confidence: 99%

“…They reported a high ZT of 1.45 at 325 K and a reduced κ t of about 0.33 Wm −1 K −1 for 0.2 wt% SiC nanoparticles. 57…”

Section: Energy Filteringmentioning

confidence: 99%

Inorganic thermoelectric materials: A review

et al. 2020

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Summary Thermoelectric generator, which converts heat into electrical energy, has great potential to power portable devices. Nevertheless, the efficiency of a thermoelectric generator suffers due to inefficient thermoelectric material performance. In the last two decades, the performance of inorganic thermoelectric materials has been significantly advanced through rigorous efforts and novel techniques. In this review, major issues and recent advancements that are associated with the efficiency of inorganic thermoelectric materials are encapsulated. In addition, miscellaneous optimization strategies, such as band engineering, energy filtering, modulation doping, and low dimensional materials to improve the performance of inorganic thermoelectric materials are reported. The methodological reviews and analyses showed that all these techniques have significantly enhanced the Seebeck coefficient, electrical conductivity, and reduced the thermal conductivity, consequently, improved ZT value to 2.42, 2.6, and 1.85 for near‐room, medium, and high temperature inorganic thermoelectric material, respectively. Moreover, this review also focuses on the performance of silicon nanowires and their common fabrication techniques, which have the potential for thermoelectric power generation. Finally, the key outcomes along with future directions from this review are discussed at the end of this article.

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“…Multiphase materials present themselves as viable candidates to take advantage of energy filtering. Given the possibilities of tuning the electronic band structure of each phase, the band bending can noticeably enhance the energy filtering effect [70][71][72][73][74][75][76][77]. In the following sections, the energy filtering effect will be discussed in multiphase materials.…”

Section: Energy Filteringmentioning

confidence: 99%

Recent Progress in Multiphase Thermoelectric Materials

Fortulan

Yamini

2021

Materials

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Thermoelectric materials, which directly convert thermal energy to electricity and vice versa, are considered a viable source of renewable energy. However, the enhancement of conversion efficiency in these materials is very challenging. Recently, multiphase thermoelectric materials have presented themselves as the most promising materials to achieve higher thermoelectric efficiencies than single-phase compounds. These materials provide higher degrees of freedom to design new compounds and adopt new approaches to enhance the electronic transport properties of thermoelectric materials. Here, we have summarised the current developments in multiphase thermoelectric materials, exploiting the beneficial effects of secondary phases, and reviewed the principal mechanisms explaining the enhanced conversion efficiency in these materials. This includes energy filtering, modulation doping, phonon scattering, and magnetic effects. This work assists researchers to design new high-performance thermoelectric materials by providing common concepts.

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Enhanced thermoelectric performance of BiSbTe alloy: Energy filtering effect of nanoprecipitates and the effect of SiC nanoparticles

Cited by 39 publications

References 43 publications

(Bi,Sb)2Te3/SiC nanocomposites with enhanced thermoelectric performance: Effect of SiC nanoparticle size and compositional modulation

(Bi,Sb)2Te3/SiC nanocomposites with enhanced thermoelectric performance: Effect of SiC nanoparticle size and compositional modulation

Inorganic thermoelectric materials: A review

Recent Progress in Multiphase Thermoelectric Materials

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