Simultaneous enhancement of thermoelectric performance and mechanical properties in Bi2Te3 via Ru compositing

Zhu, Yongming; Guo, Jun; Lin, Chen; Gu, Shi‐Wei; Zhang, Yixin; Shan, Quan; Feng, Jing; Ge, Zhen‐Hua

doi:10.1016/j.cej.2020.126407

Cited by 67 publications

(38 citation statements)

References 62 publications

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“…Thus, PbTe-30%SnSe-1.5%Cu presents a favorable low-temperature thermoelectric performance and its average ZT value can reach ≈0.98 at 300-573 K, shown in Figure 1b. More importantly, this high thermoelectric performance in PbTe-30%SnSe-1.5%Cu is comparable with the property in some n-type Bi 2 Te 3 -based materials, including commercial n-type Bi 2 Te 3 (Bi 2 Te 2.5 Se 0.5 ), [21] Bi 2 Te 2.7 Se 0.3 -1wt%Bi 2 S 3 , [22] and Bi 2 Te 3 -1wt%Ru, [23] indicating that PbTe-30%SnSe-1.5%Cu could own potential thermoelectric cooling and power generation near room temperature.…”

Section: Zt Value and Single-leg Device Performancementioning

confidence: 54%

High‐Ranged ZT Value Promotes Thermoelectric Cooling and Power Generation in n‐Type PbTe

Xiao

Shi

et al. 2022

Advanced Energy Materials

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Excellent thermoelectric cooling and power generation are simultaneously realized in an n‐type PbTe‐based thermoelectric material. The cooling temperature difference (ΔT) of ≈15.6 K, maximum power density of ≈0.4 W cm−2 and conversion efficiency of ≈1.5% with TC = 295 K and TH = 765 K can be obtained in a single‐leg device composed of PbTe‐30%SnSe‐1.5%Cu. This advanced thermoelectric performance in n‐type PbTe‐30%SnSe‐1.5%Cu mainly originates from its high‐ranged ZT value achieved through optimizing its bandgap, carrier density, and microstructure. The bandgap in PbTe is first reduced by SnSe alloying to facilitate the carrier transport properties at low temperature range (300–573 K). With further tuned carrier density, the average power factor increases from ≈10.2 µW cm−1 K−2 in Pb0.985Sb0.015Te‐30%SnSe to ≈16.2 µW cm−1 K−2 in PbTe‐30%SnSe‐1.5%Cu at 300–773 K. Moreover, microstructure observation reveals high‐density dislocations in PbTe‐30% SnSe‐1.5% Cu, which can dramatically suppress the room‐temperature lattice thermal conductivity from ≈2.21 Wm−1 K−1 in Pb0.985Sb0.015Te to ≈0.53 Wm−1 K−1 in PbTe‐30%SnSe‐1.5%Cu. As a result, a room‐temperature ZT value of ≈0.7 and high average ZT value (ZTave) of ≈0.98 can be obtained in PbTe‐30%SnSe‐1.5%Cu at 300–573 K, which makes its performance comparable to the commercial n‐type Bi2Te3‐based thermoelectric material.

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Section: Zt Value and Single-leg Device Performancementioning

confidence: 54%

High‐Ranged ZT Value Promotes Thermoelectric Cooling and Power Generation in n‐Type PbTe

Xiao

Shi

et al. 2022

Advanced Energy Materials

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“…However, hardly controlled particle aggregation even can cause a deterioration of ZT or mechanical properties instead. [22,[26][27][28][29] Therefore, exploration of the simultaneous optimization of both thermoelectric and mechanical properties is of significance for promoting thermoelectric industrialization. Recently, point defect engineering in Bi 2 Te 3 could enable to realize a thermoelectric performance enhancement due to the donor or acceptor effect of these defects, [30][31][32] but few works reported the mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Mediating Point Defects Endows n‐Type Bi₂Te₃ with High Thermoelectric Performance and Superior Mechanical Robustness for Power Generation Application

Zhu

Sun

Zhu

et al. 2022

Small

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Bi2Te3‐related alloys dominate the commercial thermoelectric market, but the layered crystal structure leads to the dissociation and intrinsic brittle fracture, especially for single crystals that may worsen the practical efficiency. In this work, point defect configuration by S/Te/I defects engineering is engaged to boost thermoelectric and mechanical properties of n‐type Bi2Te3 alloy, which, coupled with p‐type BiSbTe, shows a competitive conversion efficiency for the fabricated module. First, as S alloying suppresses the intrinsic BiTe, antisite defects and forms a donor‐like effect, electronic transport properties are optimized, associated with the decreased thermal conductivity due to the point defect scattering. The periodide compound TeI4 is afterward adopted to further tune carrier concentration for the realization of an optimal ZT. Finally, an advanced average ZT of 1.05 with ultra‐high compressive strength of 230 MPa is achieved for Bi2Te2.9S0.1(TeI4)0.0012. Based on this optimum composition, a fabricated 17‐pair module demonstrates a maximum conversion efficiency of 5.37% under the temperature difference of 250 K, rivaling the current state‐of‐the‐art Bi2Te3 modules. This work reveals the novel mechanism of point defect reconfiguration in synergistic enhancement of thermoelectric and mechanical properties for durably commercial application, which may be applicable to other thermoelectric systems.

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“…FIGURE 6 | Thermal properties of (La 1-x Ho x ) 3 NbO 7 (x 0/6, 1/6, 2/6, 3/6, 4/6, 5/6, and 6/6) ceramics: (A) thermal expansion rate, (B) first-order differential curve, (C) thermal expansion coefficients; and (D) comparison of thermal conductivity and TECs among various oxide TBCs (Vassen et al, 2000;Schlichting et al, 2001;Zhao et al, 2016;Chen et al, 2018;Ren et al, 2019;Chen et al, 2020;Liu et al, 2020;Liu et al, 2020;Ren et al, 2020;Chen et al, 2021;Chen et al, 2021).…”

Section: Discussionmentioning

confidence: 99%

“…Among various ceramics, the ones with pyrochlore-/fluorite-type structures have lower thermal conductivity and better phase stability than YSZ. Hence, oxides having pyrochlore-/fluorite-type structures are broadly studied, and thermophysical property improvements are essential for various materials (Ma et al, 2008;Wang et al, 2012;Wright et al, 2020;Adjaoud and Albe, 2021;Irum et al, 2021;Wang et al, 2021;Xiang et al, 2021;Zhang et al, 2021;Zhu et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Structures, and Thermophysical Properties Characterizations of (La1-xHox)3NbO7 Solid Solutions as Thermal Barrier Coatings

et al. 2021

Self Cite

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A sequence of (La1-xHox)3NbO7 solid solutions were fabricated in this work, which were studied as candidate for thermal insulation materials. The lattices were identified via XRD, when SEM and EDS were used to characterize the microstructures and element distributions. The results showed that the highest modulus, hardness, and toughness of (La1-xHox)3NbO7 were 196 GPa, 9.2 GPa, and 1.6 MPa m1/2, respectively, and they accorded with the mechanical property requirements. Also, a low thermal conductivity (1.06 W m−1 K−1) and high thermal expansion coefficients (TECs: 11.3 × 10−6 K−1) were simultaneously realized in (La3/6Ho3/6)3NbO7, at high temperatures. No phase transition was detected up to 1,200°C, which proved their good high-temperature lattice stability. The intense anharmonic lattice vibrations might contribute to the outstanding thermal properties of (La1-xHox)3NbO7 ceramics. The suitable modulus, high hardness, low thermal conductivity, and high TECs of (La1-xHox)3NbO7 solid solutions proclaimed that they were exceptional thermal insulation ceramics.

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Simultaneous enhancement of thermoelectric performance and mechanical properties in Bi2Te3 via Ru compositing

Cited by 67 publications

References 62 publications

High‐Ranged ZT Value Promotes Thermoelectric Cooling and Power Generation in n‐Type PbTe

High‐Ranged ZT Value Promotes Thermoelectric Cooling and Power Generation in n‐Type PbTe

Mediating Point Defects Endows n‐Type Bi₂Te₃ with High Thermoelectric Performance and Superior Mechanical Robustness for Power Generation Application

Structures, and Thermophysical Properties Characterizations of (La1-xHox)3NbO7 Solid Solutions as Thermal Barrier Coatings

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Simultaneous enhancement of thermoelectric performance and mechanical properties in Bi2Te3 via Ru compositing

Cited by 67 publications

References 62 publications

High‐Ranged ZT Value Promotes Thermoelectric Cooling and Power Generation in n‐Type PbTe

High‐Ranged ZT Value Promotes Thermoelectric Cooling and Power Generation in n‐Type PbTe

Mediating Point Defects Endows n‐Type Bi2Te3 with High Thermoelectric Performance and Superior Mechanical Robustness for Power Generation Application

Structures, and Thermophysical Properties Characterizations of (La1-xHox)3NbO7 Solid Solutions as Thermal Barrier Coatings

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Product

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Mediating Point Defects Endows n‐Type Bi₂Te₃ with High Thermoelectric Performance and Superior Mechanical Robustness for Power Generation Application