Rapid preparation of bulk Al x Yb0.25Co4Sb12 (x = 0, 0.1, 0.2, 0.3) skutterudite thermoelectric materials with high figure of merit ZT = 1.36

Elsheikh, Mohamed Hamid; Sabri, Mohd Faizul Mohd; Said, Suhana Mohd; Miyazaki, Yasumitsu; Masjuki, H.H.; Shnawah, Dhafer Abdulameer; Naito, Shuma; Bashir, Mohamed Bashir Ali

doi:10.1007/s10853-017-0772-8

Cited by 27 publications

(14 citation statements)

References 36 publications

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“…Most importantly, the average ZT value is boosted from 0.78 for the pristine sample to 0.96 for the sample Yb 0.21 Co 4 Sb 12 /0.32CoAl between 300 and 873 K, displaying an enhancement over 23% when compared with the pristine sample (Figure b). Although the ZT value for introducing the CoAl sample in this work is not superior to that of the reported samples with AlSb, GaSb, and InSb, − the in situ precipitated CoAl second phases can indeed improve the TE properties of Yb-filled skutterudites to a certain extent.…”

Section: Resultsmentioning

confidence: 66%

“…Nanocomposites play critical roles in affecting carriers and phonons’ transport of TE materials. ,, The ex situ added or in situ precipitated nanoparticles, such as oxides, ,, antimonides, − silicides, , metals, , borides, , tellurides, − nitrides, carbon-type materials, ,,, or magnetic materials, , can effectively disrupt the middle-frequency phonon propagation and thus lower the lattice thermal conductivity. ,, However, charged carriers with the shorter mean free path are almost unaffected. Simultaneously, some nanoparticles, such as Fe 3 Si, SiC, CoSi, and Ta 0.8 Zr 0.2 B, and so forth, ,,, can also boost the resistance of crack growth and improve the mechanical properties, which is important to the processing and application of TE materials.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Thermoelectric and Mechanical Performance in n-Type Yb-Filled Skutterudites through Aluminum Alloying

Qin

Cui

Zhu

et al. 2020

ACS Appl. Mater. Interfaces

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Herein, we demonstrate a synergistic combination of novel mechanisms in aluminum (Al)-alloyed Yb 0.3 Co 4 Sb 12 -based thermoelectric materials to address both reduction in thermal conductivity and concomitant enhancement in power factor (PF). Upon Al alloying, CoAl nanoprecipitates are embedded in the matrix, leading to (1) significant local strain and thus intensified phonon scattering and (2) carrier injection because of interphase electron transfer. Moreover, by decreasing the Yb filling fraction, not only is the electronic thermal conductivity significantly suppressed but also the carrier concentration is modulated to the optimum range, thus resulting in the dramatically boosted PF, especially below 773 K. As a result, a peak ZT value of 1.36 at 873 K and ZT ave of 0.96 from 300 to 873 K were obtained in Yb 0.21 Co 4 Sb 12 /0.32CoAl. Last but not the least, the mechanical properties of the Al-alloyed samples were considerably improved through CoAl precipitate hardening, offering great potential for commercial applications.

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Section: Resultsmentioning

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Enhanced Thermoelectric and Mechanical Performance in n-Type Yb-Filled Skutterudites through Aluminum Alloying

Qin

Cui

Zhu

et al. 2020

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…In addition, it should me mentioned that these ZT values are in the range of or even higher than those of skutterudites, with outstanding high ZTs, prepared in the traditional way, i. e. by HP or spark plasma sintering. [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] The ZT-matching thermal-electric conversion efficiencies, η, are plotted in the lower panel of Figure 11. Whereas in case of the p-type samples almost all efficiencies (calculated for the temperature range of 300 K to 857 K) are in the range of 14 % to 15 %, the efficiencies of the n-type samples, due to a bigger variety in ZT values, vary between 9.8 % and 17.9 %, the latter being an outstanding high value.…”

Section: Samples With a Height Of ~1 MMmentioning

confidence: 99%

High pressure torsion, a large‐scale manufacturing tool for high ZT skutterudite thermoelectrics

Rogl

2022

Zeitschrift anorg allge chemie

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Dedicated to Professor Mercouri Kanatzidis on the occasion of his 65th birthdayFor mass production of thermoelectric generators, a cheap/ sustainable method is required to fabricate leg material with a high figure of merit, ZT. Severe plastic deformation, SPD, increases the defect density, and in parallel decreases the grains to nano-size. SPD via high-pressure torsion, HPT, was used to process hot pressed discs, whereby the Seebeck coefficient remained unchanged and the enhanced electrical resistivity was overcompensated by a low thermal conductivity, resulting in a raise of ZT. Secondly, cold pressed commercial p-and n-type skutterudite-powder was deformed via HPT, exhibiting higher ZT values than the hot-pressed reference samples. This method was upscaled to samples of 30 mm diameter (heights: 1 mm, 8 mm). These large samples, enabled to study the influence of shear strain with all its impact on micro-structural, physical and mechanical properties, revealing for the thin samples record high ZTs. Both thick samples showed homogeneous properties and ZTs ~1.3.

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“…(A) Miscellaneous Skutterudites with its lowest κ t value at divergent temperature range. (B) Miscellaneous optimization techniques for the enhancement of ZT values of high performance skutterudites …”

Section: High Performance Inorganic Te Materialsmentioning

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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Rapid preparation of bulk Al x Yb0.25Co4Sb12 (x = 0, 0.1, 0.2, 0.3) skutterudite thermoelectric materials with high figure of merit ZT = 1.36

Cited by 27 publications

References 36 publications

Enhanced Thermoelectric and Mechanical Performance in n-Type Yb-Filled Skutterudites through Aluminum Alloying

Enhanced Thermoelectric and Mechanical Performance in n-Type Yb-Filled Skutterudites through Aluminum Alloying

High pressure torsion, a large‐scale manufacturing tool for high ZT skutterudite thermoelectrics

Inorganic thermoelectric materials: A review

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