High-entropy-stabilized chalcogenides with high thermoelectric performance

Jiang, Binbin; Yu, Yong; Cui, Juan; Liu, Xixi; Xie, Lin; Liao, Jincheng; Zhang, Qihao; Huang, Yi; Ning, Shoucong; Jia, Baohai; Zhu, Bin; Bai, Shengqiang; Chen, Lidong; Pennycook, Stephen J.; He, Jiaqing

doi:10.1126/science.abe1292

Cited by 704 publications

(560 citation statements)

References 66 publications

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“…Among them, κ ele is directly proportional to σ , T , and the Lorenz number L according to the Wiedemann–Franz law, κ ele = LσT 1 . Considering that κ lat is an independent parameter with electrical properties, numerous strategies for reducing κ lat have attracted extensive attention from researchers for realizing higher ZT in various thermoelectric systems 25–35 …”

Section: Introductionmentioning

confidence: 99%

“…The introduction of multiscale extrinsic defects to reduce κ lat has become a very advanced approach in the thermoelectric field 26,86–94 . Additionally, the new concepts of atomic ordering and high‐entropy engineering have recently been found to be effective in decreasing κ lat and enhancing the ZT values of various materials 27,95 . The heat in the lattice is carried by phonons of several modes and frequencies, and κ lat is the sum of all thermal conductivities 1 .…”

Section: Introductionmentioning

confidence: 99%

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Slowing down the heat in thermoelectrics

Qin

Wang

Zhao

2021

InfoMat

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Heat transport has various applications in solid materials. In particular, the thermoelectric technology provides an alternative approach to traditional methods for waste heat recovery and solid‐state refrigeration by enabling direct and reversible conversion between heat and electricity. For enhancing the thermoelectric performance of the materials, attempts must be made to slow down the heat transport by minimizing their thermal conductivity (κ). In this study, a continuously developing heat transport model is reviewed first. Theoretical models for predicting the lattice thermal conductivity (κlat) of materials are summarized, which are significant for the rapid screening of thermoelectric materials with low κlat. Moreover, typical strategies, including the introduction of extrinsic phonon scattering centers with multidimensions and internal physical mechanisms of materials with intrinsically low κlat, for slowing down the heat transport are outlined. Extrinsic defect centers with multidimensions substantially scatter various‐frequency phonons; the intrinsically low κlat in materials with various crystal structures can be attributed to the strong anharmonicity resulting from weak chemical bonding, resonant bonding, low‐lying optical modes, liquid‐like sublattices, off‐center atoms, and complex crystal structures. This review provides an overall understanding of heat transport in thermoelectric materials and proposes effective approaches for slowing down the heat transport to depress κlat for the enhancement of thermoelectric performance.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Slowing down the heat in thermoelectrics

Qin

Wang

Zhao

2021

InfoMat

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“…So, in FeRhIrPdPt, the different phases would be responsible for the spin-glass transition and the high-temperature FM correlation. In the binary alloys, FeRh 4 and FeIr 4 are spin-glass materials, while FePd 4 and FePt 4 are ferromagnets. Based on the atomic ratios in the dual-phase of FeRhIrPdPt, we speculate that the main phase rich in Rh and Ir and minor one rich in Pd and Pt exhibit the spin-glass transition and the FM correlation, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…High-entropy alloys (HEAs) were initially proposed for simple crystal structures such as face-centered cubic (fcc), body-centered cubic (bcc), and hexagonal close packing (hcp), in which more than five elements, each having an atomic fraction between 5% and 35%, randomly occupy one crystallographic site [ 1 , 2 ]. The HEA concept is now adopted in various crystal structures [ 3 , 4 ]. The high-entropy state contributes to the stability of the solid solution with the desired crystal structure through the relatively large mixing entropy.…”

Section: Introductionmentioning

confidence: 99%

Magnetic and Transport Properties of New Dual-Phase High-Entropy Alloy FeRhIrPdPt

et al. 2021

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High-entropy alloys (HEAs) are broadly explored from the perspective of mechanical, corrosion-resistance, catalytic, structural, superconducting, magnetic properties, and so on. In magnetic HEAs, 3d transition metals or rare-earth elements are well-studied compositional elements. We researched a magnetic HEA containing Fe combined with 4d and 5d transition metals, which has not been well investigated, and found a new dual-phase face-centered-cubic (fcc) HEA FeRhIrPdPt. The structural, magnetic, and transport properties were evaluated by assuming that FeRhIrPdPt is a mixture of FeRh4, FeIr4, FePd4, and FePt4, all with the fcc structure. The dual-phase is composed of a Rh- and Ir-rich main phase and a Pd- and Pt-rich minor one. FeRh4 and FeIr4 show spin freezings at low temperatures, while FePd4 and FePt4 are ferromagnetic. Two magnetic features can characterize FeRhIrPdPt. One is the canonical spin-glass transition at 90 K, and the other is a ferromagnetic correlation that appears below 300 K. The main and minor phases were responsible for the spin-glass transition and the ferromagnetic correlation below 300 K, respectively.

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“…[8][9][10] Whereas, existing TEGs are primarily fabricated using rigid or non-stretchable components, which restrains their capability to conform to human skin or accommodate human motions. [11][12][13][14][15] To meet the requirement of wearability, TEGs must possess high mechanical flexibility and preferable stretchability, and in the meantime can provide consistent energy output even having encountered mechanical damages.…”

Section: Introductionmentioning

confidence: 99%

A Wavy-Structured Highly Stretchable Thermoelectric Generator with Stable Energy Output and Self-Rescuing Capability

et al. 2021

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Thermoelectric generators (TEGs) demonstrate great potential for flexible and wearable electronics due to the direct electrical energy harvesting from waste heat. Good wearability requires high mechanical flexibility and preferable stretchability, while current TEGs are primarily developed with rigid or non-stretchable components, which cannot well conform to human skin or accommodate human motions, thus hindering further applications. Herein, a wavy architecture is proposed for the fabrication of stretchable TEGs, where a stretchable and self-healable hydrogel is employed as device substrate, and intrinsically flexible highperformance TE films are attached to form wavy morphologies. The wavy-structured TEG can be readily stretched to 300%, and in the meantime can sustain a stable energy output with more than 90% TE performance retained, which outperforms most of the reported state-of-the-art TE materials and TEGs. It also demonstrates a desired device-level self-rescuing capability originated from the effective self-healing of the hydrogel and the wavy structure of TE legs, thereby providing persistent energy supply upon injuries or damages. This work offers a promising approach for the design of next-generation stretchable and wearable TEGs.

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High-entropy-stabilized chalcogenides with high thermoelectric performance

Cited by 704 publications

References 66 publications

Slowing down the heat in thermoelectrics

Slowing down the heat in thermoelectrics

Magnetic and Transport Properties of New Dual-Phase High-Entropy Alloy FeRhIrPdPt

A Wavy-Structured Highly Stretchable Thermoelectric Generator with Stable Energy Output and Self-Rescuing Capability

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