High thermoelectric figure of merit in well optimized YbyCo4Sb12

Alleno, É.; Benyahia, M.; Vaney, Jean‐Baptiste; Provost, Karine; Paul‐Boncour, V.; Monnier, Judith; Dauscher, A.; Lenoir, Bertrand

doi:10.1039/d0tc03455j

Cited by 9 publications

(7 citation statements)

References 61 publications

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“… ZT of Yb 0.25 Co 4 Sb 12 / x CoSi 2 composites: (a) temperature dependent ZT ; (c) average ZT value; comparison of ZT max (b) and ZT ave (d) of Yb 0.25 Co 4 Sb 12 /0.05CoSi 2 sample with other representative works. ,,,,− ,− …”

Section: Resultsmentioning

confidence: 96%

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Enhanced Thermoelectric Performance of Yb-Filled Skutterudite with Bottom-Up Formed CoSi₂ Nanoparticles

Shi

Niu

et al. 2022

ACS Appl. Mater. Interfaces

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It is known that Yb-filled skutterudite with excellent thermoelectric performance is promising for a power generation device in the intermediate temperature region. Here we created a new approach to obtain nanostructured materials by adding Si to Co-overstoichiometric Yb-filled skutterudite through high-energy ball milling, which embedded bottom-up formed CoSi 2 nanoparticles into grain-refining Yb 0.25 Co 4 Sb 12 , synergistically resulting in the enhanced thermoelectric properties and room-temperature hardness. On one hand, the abundant grain boundaries and phase interfaces effectively blocked the propagation of medium-low frequency phonons, resulting in a lower lattice thermal conductivity. On the other hand, phase interfaces barrier nicely screened a portion of low-energy electrons, leading to an improved power factor. As a result, an enhanced peak ZT value of ∼1.43 at 823 K and a promising average ZT of ∼1.00 between 300 and 823 K were achieved in the Yb 0.25 Co 4 Sb 12 / 0.05CoSi 2 sample. Meanwhile, such nanostructures also enhanced the hardness through the collective contributions of second phase and fine grain strengthening, which made skutterudite more competitive in practical application.

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Section: Resultsmentioning

confidence: 96%

“…Carrier concentration dependent (a) mobility and (b) Seebeck coefficient of this work and other n-type skutterudites. ,,,,− The black dash line is the trend line of filled skutterudite . The blue dash line is the Pisarenko line of filled skutterudite calculated using the three-band model …”

Section: Resultsmentioning

confidence: 99%

Enhanced Thermoelectric Performance of Yb-Filled Skutterudite with Bottom-Up Formed CoSi₂ Nanoparticles

Shi

Niu

et al. 2022

ACS Appl. Mater. Interfaces

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“…Combined with high power factors, this limited ability to transport heat leads to high ZT values of 1.0 near 800 K [29,30,[101][102][103][104][105][106][107][108][109][110][111][112][113][114][115][116][117][118]. Benefiting from either nanostructuration, multiple-filling approach or optimization of the filling fraction by specific metallurgical routes, further enhancement of these ZT values up to 1.5 could be achieved [118,[120][121][122].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Thermoelectric materials for space applications

et al. 2021

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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“…However, the complex peritectic solidification process makes it time-consuming and hard to control the phase composition in the preparation of CoSb 3 -based skutterudites. To the best of our knowledge, the traditional melting–quenching–annealing process takes at least ∼4 days − to allow sufficient solute–solid diffusion and obtain high-purity CoSb 3 -based skutterudites. Rogl et al completed this melting–annealing process within 4 days and prepared multifilled nanocrystalline p-type skutterudites.…”

Section: Introductionmentioning

confidence: 99%

Impurity Removal Leading to High-Performance CoSb₃-Based Skutterudites with Synergistic Carrier Concentration Optimization and Thermal Conductivity Reduction

Liu

et al. 2021

ACS Appl. Mater. Interfaces

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Thermoelectric properties of CoSb 3 -based skutterudites are greatly determined by the removal of detrimental impurities, such as (Fe/Co)Sb 2 , (Fe/Co)Sb, and Sb. In this study, we use a facile temperature gradient zone melting (TGZM) method to synthesize high-performance CoSb 3 -based skutterudites by impurity removal. After removing metallic or semimetallic impurities (Fe/Co)Sb, (Fe/Co)Sb 2 , and Sb, the carrier concentration of TGZM-Ce 0.75 Fe 3 CoSb 12 can be reduced to 1.21 × 10 20 cm −3 and the electronic thermal conductivity dramatically reduced to 0.7 W m −1 K −1 at 693 K. Additionally, removing these impurities also effectively reduces the lattice thermal conductivity from 7.2 W m −1 K −1 of cast-Ce 0.75 Fe 3 CoSb 12 to 1.02 W m −1 K −1 of TGZM-Ce 0.75 Fe 3 CoSb 12 at 693 K. As a consequence, TGZM-Ce 0.75 Fe 3 CoSb 12 approaches a high power factor of 11.7 μW cm −1 K −2 and low thermal conductivity of 1.72 W m −1 K −1 at 693 K, leading to a peak zT of 0.48 at 693 K, which is 10 times higher than that of cast-Ce 0.75 Fe 3 CoSb 12 . This study indicates that our facile TGZM method can effectively synthesize high-performance CoSb 3 -based skutterudites by impurity removal and set up a solid foundation for further development.

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High thermoelectric figure of merit in well optimized Yb_yCo₄Sb₁₂

Abstract: By carefully controlling the ytterbium concentration, the power factor has been optimized for YbyCo4Sb12, leading to ZT = 1.4 at 750 K in Yb0.15Co4Sb12.

Cited by 9 publications

References 61 publications

Enhanced Thermoelectric Performance of Yb-Filled Skutterudite with Bottom-Up Formed CoSi₂ Nanoparticles

Enhanced Thermoelectric Performance of Yb-Filled Skutterudite with Bottom-Up Formed CoSi₂ Nanoparticles

Thermoelectric materials for space applications

Impurity Removal Leading to High-Performance CoSb₃-Based Skutterudites with Synergistic Carrier Concentration Optimization and Thermal Conductivity Reduction

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High thermoelectric figure of merit in well optimized YbyCo4Sb12

Abstract: By carefully controlling the ytterbium concentration, the power factor has been optimized for YbyCo4Sb12, leading to ZT = 1.4 at 750 K in Yb0.15Co4Sb12.

Cited by 9 publications

References 61 publications

Enhanced Thermoelectric Performance of Yb-Filled Skutterudite with Bottom-Up Formed CoSi2 Nanoparticles

Enhanced Thermoelectric Performance of Yb-Filled Skutterudite with Bottom-Up Formed CoSi2 Nanoparticles

Thermoelectric materials for space applications

Impurity Removal Leading to High-Performance CoSb3-Based Skutterudites with Synergistic Carrier Concentration Optimization and Thermal Conductivity Reduction

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High thermoelectric figure of merit in well optimized Yb_yCo₄Sb₁₂

Enhanced Thermoelectric Performance of Yb-Filled Skutterudite with Bottom-Up Formed CoSi₂ Nanoparticles

Enhanced Thermoelectric Performance of Yb-Filled Skutterudite with Bottom-Up Formed CoSi₂ Nanoparticles

Impurity Removal Leading to High-Performance CoSb₃-Based Skutterudites with Synergistic Carrier Concentration Optimization and Thermal Conductivity Reduction