Enhancement in Thermoelectric Figure‐Of‐Merit of an N‐Type Half‐Heusler Compound by the Nanocomposite Approach

Joshi, Giri; Yan, Xiao; Wang, Hengzhi; Liu, Weishu; Chen, Gang; Ren, Zhifeng

doi:10.1002/aenm.201100126

Cited by 298 publications

(244 citation statements)

References 31 publications

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“…Fig. 6 (f-j) shows the temperature 40 dependent thermoelectric properties of the twice-repressed Bi 2 Te 2.7-x Se 0.3 S x with different amount of sulfur concentrations (x=0, 0.2, and 0.4). As compared with the as-pressed sample, the twice-repressed sample shows a considerable reduction in electrical resistivity due to texturing.…”

Section: Resultsmentioning

confidence: 99%

“…All three possible substitutions of sulfur with selenium have been investigated. 40 Se atoms in the Bi 2 Se 1 S 2 compound are most likely in the S(2)-site of the Bi 2 S 3 -type lattice structure, as shown in 8 are also a mixture of the rhombohedral and orthorhombic phase. The predicted mixture region, presented in Fig.…”

Section: Methodsmentioning

confidence: 99%

“…3 -12 Bi 2 Te 3 -based materials are also used in low-temperature heat to electricity conversion applications, including solar to electrical generation. 13,14 For these applications, the hot side temperature is typically less than 250 o C due to the ZT value drop and materials' instability above 300 o C. For the mid-temperature range between 200-600 o C, 40 other materials such as PbTe, skutterudites, and half Heuslers are being studied. The primary motivation of this work is to explore some new compositions within the Bi 2 Te 3 -Bi 2 Se 3 -Bi 2 S 3 system to achieve higher ZT values in the mid-temperature range.…”

Section: Introductionmentioning

confidence: 99%

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Studies on the Bi₂Te₃–Bi₂Se₃–Bi₂S₃system for mid-temperature thermoelectric energy conversion

Liu

Lukas

McEnaney

et al. 2013

Energy Environ. Sci.

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10Bismuth telluride (Bi 2 Te 3 ) and its alloys have been widely investigated as thermoelectric materials for cooling applications at around room temperature. We report a systematic study on many compounds in the Bi 2 Te 3 -Bi 2 Se 3 -Bi 2 S 3 system. All the samples were fabricated by high energy ball milling followed with hot pressing. Among the investigated compounds, Bi 2 Te 2 S 1 shows a peak ZT ~0.8 at 300 o C 15 and Bi 2 Se 1 S 2 ~0.8 at 500 o C. These results show that these compounds can be used for mid-temperature power generation applications. The leg efficiency of thermoelectric conversion for segmented elements based on these n-type materials could potentially reach 12.5% with cold side at 25 o C and hot side at 500 o C if appropriate p-type legs are paired, which could compete well with the state-of-the-art ntype materials within the same temperature range, including lead tellurides, lead selenides, lead sulfides, filled-skutterudites, and half Heuslers. 20 Broader ContextThermoelectric convertor has provided a new class of green energy from solar heat, terrestrial heat, waste heat from both automobile vehicles and industrial operations. Bi 2 Te 3 -based materials have distinguished themself in low-temperature power generation applications. For these applications, the hot side temperature is typically limited to less than 250 o C due to the declining ZT value. For the mid-25 temperature range, PbTe and skutterudite materials were being considered as the candidates. However, the toxicity or thermal stability issue is still the most worrying part for these materials. In this work, we proposed an alternative way by using a segmented leg made from Bi 2 (Te, Se, S) 3 -based materials, which shows a potential leg efficiency of 12.5% with cold side of 25 o C and hot side of 500 o C. It competes well with the state-of-the-art n-type materials within the same temperature range. Specifically, two new compounds, i.e., Bi 2 Te 2 S 1 and Bi 2 Se 1 S 2 , have been identified as the promising materials for the mid-temperature applications.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Studies on the Bi₂Te₃–Bi₂Se₃–Bi₂S₃system for mid-temperature thermoelectric energy conversion

Liu

Lukas

McEnaney

et al. 2013

Energy Environ. Sci.

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275

212

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“…Previous studies [15][16][17] demonstrated the competence of the nanostructuring in suppressing the lattice thermal conductivity and thus improving zT . Most of the recent experimental studies on the strong reduction of the lattice thermal conductivity in nanostructured PbTe [9,10] emphasized the importance of dislocations, nanoscale precipitates and strain while pointing out that the mere presence of nanostructuring cannot sufficiently increase the phonon scattering.…”

Section: Introductionmentioning

confidence: 99%

Phonon conduction in PbSe, PbTe, and PbTe1−xSexfrom first-principles calculations

et al. 2012

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We apply first-principles calculations to lead selenide (PbSe) and lead telluride (PbTe) and their alloys (PbTe 1-x Se x ) which are potentially good thermoelectric materials, to investigate their phonon transport properties. By accurately reproducing the lattice thermal conductivity, we validate the approaches adopted in this work. We then compare and contrast PbSe and PbTe, evaluate the importance of the optical phonons to lattice thermal conductivity, and estimate the impacts of nanostructuring and alloying on further reducing the lattice thermal conductivity. The results indicate that: 1) the optical phonons are important not only because they directly comprise over 20% of the lattice thermal conductivity, but also because they provide strong scattering channels for acoustic phonons, which is crucial for the low thermal conductivity; 2) nanostructures of less than ~10 nm are needed to reduce the lattice thermal conductivity for pure PbSe and PbTe; 3) alloying should be a relatively effective way to reduce the lattice thermal conductivity.

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“…PbSe:Al (9.4%) [38,39] half Heuslers (8.4%) [38,40], filled Skutterrudites (13.1%) [38,41], and PbTe:…”

Section: Resultsmentioning

confidence: 99%

Enhancement of thermoelectric performance in n-type PbTe1−Se by doping Cr and tuning Te:Se ratio

et al. 2015

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Enhancement in Thermoelectric Figure‐Of‐Merit of an N‐Type Half‐Heusler Compound by the Nanocomposite Approach

Cited by 298 publications

References 31 publications

Studies on the Bi₂Te₃–Bi₂Se₃–Bi₂S₃system for mid-temperature thermoelectric energy conversion

Studies on the Bi₂Te₃–Bi₂Se₃–Bi₂S₃system for mid-temperature thermoelectric energy conversion

Phonon conduction in PbSe, PbTe, and PbTe1−xSexfrom first-principles calculations

Enhancement of thermoelectric performance in n-type PbTe1−Se by doping Cr and tuning Te:Se ratio

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Enhancement in Thermoelectric Figure‐Of‐Merit of an N‐Type Half‐Heusler Compound by the Nanocomposite Approach

Cited by 298 publications

References 31 publications

Studies on the Bi2Te3–Bi2Se3–Bi2S3system for mid-temperature thermoelectric energy conversion

Studies on the Bi2Te3–Bi2Se3–Bi2S3system for mid-temperature thermoelectric energy conversion

Phonon conduction in PbSe, PbTe, and PbTe1−xSexfrom first-principles calculations

Enhancement of thermoelectric performance in n-type PbTe1−Se by doping Cr and tuning Te:Se ratio

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Product

Resources

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Studies on the Bi₂Te₃–Bi₂Se₃–Bi₂S₃system for mid-temperature thermoelectric energy conversion

Studies on the Bi₂Te₃–Bi₂Se₃–Bi₂S₃system for mid-temperature thermoelectric energy conversion