Grain Boundaries Softening Thermoelectric Oxide BiCuSeO

Li, Guodong; Hao, Shiqiang; Zhai, Pengcheng; Zhang, Qingjie; Goddard, William A.; Snyder, G. Jeffrey

doi:10.1021/acsami.7b19501

Cited by 10 publications

(10 citation statements)

References 31 publications

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Section: Structures and Properties Of Layered Thermoelectric Materialsmentioning

confidence: 99%

“…The highest ZT value was achieved with Ba and Ni dual‐doped sample Bi 0.875 Ba 0.125 Cu 0.85 Ni 0.15 SeO. [27a] In a recent simulation work of BiCuSeO, Li et al proposed that by examining the ideal shear strength and failure mechanism, grain boundary engineering can offer another pathway to strengthen the mechanical properties of polycrystalline BiCuSeO materials for commercial applications . As for its n‐type counterpart Ge‐doped Bi 2 O 2 Se, point substitutional defects in Bi sublattice and oxygen vacancies can generate extra electrons, and degenerations was found in both electrical conductivity and Seebeck coefficient.…”

Section: Structures and Properties Of Layered Thermoelectric Materialsmentioning

confidence: 99%

See 1 more Smart Citation

Recent Advances of Layered Thermoelectric Materials

Liu

Wang

Yang

et al. 2018

Advanced Sustainable Systems

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of electronic and phononic subsystems, the enhancement in a parameter can frequently deteriorate another, making the improvement of ZT very challenging. [2b-d] Based on Peltier and Seebeck effects, thermoelectric materials are widely used in up-to-date thermoelectric refrigeration and power-generation devices. [3] The schematic illustration of typical thermoelectric refrigeration and power-generation modes are shown in Figure 1. As shown in the figure, the thermoelectric module consists of a p-type and an n-type material, which are interconnected by a metallic electrical contact pads. The actual thermoelectric module is composed of an array of these couples, allowing an efficient thermoelectric energy conversion when a temperature gradient is applied. Conversely, when the current is passed through a thermoelectric module, a temperature gradient will be generated due to Peltier effect. [3] The heat could then be absorbed in the cold side and eventually being withdrawn by the sink, and therefore leads to the effect of refrigeration. In order to improve the efficiency, Lim et al. proposed a cascade refrigeration system using the thermoelectric modules. [4] In the cascade system, the heat absorption efficiency is 1.7 times better than the single system, and temperature difference of the thermoelectric module is significantly lowered to 30 °C compared to 60 °C of the single system, which made it possible to apply thermoelectric refrigerators to small capacity household applications. In 2018, a novel wearable thermoelectric generator was designed and fabricated by Kim et al. [5] This application could be easily attached to human skin for utilizing human body heat as the heat source, and thus could be used in various applications, such as self-powered wearable electrocardiography, and self-powered wireless sensor network for industry. This reflects the recent trend for developing thermoelectric technology with strong focuses on portable, flexible household and industry devices.Layered materials have long been investigated as promising thermoelectric materials in the past 50 years, from the early prototypes of PbTe and Bi 2 Te 3 . [2b] With different strengths of interlayer chemical bondings, the layered materials could be divided into two categories: typical covalent/ionic natural bulk layered materials, such as layered cobalt oxides, [7] bismuth oxyselenide, [8] artificial layered materials, such as superlattices including Bi 2 Te 3 /Sb 2 Te 3 , [9] SrTiO 3 /SrTi 0.8 Nb 0.3 O 3 , [10] GaAs/AlAs; and van der Waals layered materials including Te-based alloy, [2b] as well as artificially engineered van der Waals heterostructures like organic intercalated TiS 2 . [11] In the former case, both the intra-and interlayer chemical bondings With the continuous demands on developing renewable energy technologies to solve the global energy crisis, thermoelectric materials have attracted huge attention due to their ability to convert waste heat to useful electricity. The main advantage of layer-structured materials for thermoel...

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Section: Structures and Properties Of Layered Thermoelectric Materialsmentioning

confidence: 99%

Section: Structures and Properties Of Layered Thermoelectric Materialsmentioning

confidence: 99%

Recent Advances of Layered Thermoelectric Materials

Liu

Wang

Yang

et al. 2018

Advanced Sustainable Systems

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show abstract

“…In addition, lowering the κ can also be a breakthrough to obtain high zT . The transmission of phonons could be suppressed through introducing appropriate dislocations, nanoprecipitates, , point defects, and grain boundaries. , Currently, the synergistic adjustment of the phonon and electron transport properties could considerably improve the TE performance …”

Section: Introductionmentioning

confidence: 99%

Manipulating the Solubility of SnSe in SnTe by Br Doping for Improving the Thermoelectric Performance

Zhang

Liu

et al. 2021

ACS Appl. Energy Mater.

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As a potential thermoelectric (TE) candidate with a rock salt structure similar to PbTe, SnTe has attracted much attention in recent years. However, a high carrier concentration caused by its inherent Sn vacancy severely lowers the TE performance. In this study, it is found that the introduction of Br on the basis of Se doping not only manipulates the carrier concentration but also reduces the solubility of SnSe in SnTe to form SnSe nanoprecipitates with suitable sizes (<10 nm) to scatter phonons. Thereby, the power factor is improved (∼1943 μW m −1 K −2 ) and the thermal conductivity is reduced (∼2.13 W m −1 K −1 ), pushing the zT value up to ∼0.75 (Sn 1.03 Se 0.12 Te 0.870 Br 0.010 ) at 823 K. This study combines the carrier and chemical solubility engineering by halogen doping and provides an approach to improve the TE performance of materials with similar structures.

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“…Among them, p‐ type BiCuSeO and n‐ type Bi 2 O 2 Se have received extensive attention because of their low thermal conductivities. [ 10–14 ] BiCuSeO exhibits a 2D layered structure and can be viewed as alternate stacks of the insulating [Bi 2 O 2 ] 2+ layers and the conductive [Cu 2 Se 2 ] 2− layers. [ 15,16 ] In addition to the phonon scattering caused by layered structure, the anharmonicity of Bi 3+ lone pair [ 17 ] and the local vibration of Cu + [ 18 ] jointly lead to the low thermal conductivity in BiCuSeO.…”

Section: Introductionmentioning

confidence: 99%

Electrical and Thermal Transport Properties of n‐type Bi₆Cu₂Se₄O₆ (2BiCuSeO + 2Bi₂O₂Se)

et al. 2019

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New thermoelectric materials, n-type Bi 6 Cu 2 Se 4 O 6 oxyselenides, composed of well-known BiCuSeO and Bi 2 O 2 Se oxyselenides, are synthesized with a simple solid-state reaction. Electrical transport properties, microstructures, and elastic properties are investigated with an emphasis on thermal transport properties. Similar to Bi 2 O 2 Se, it is found that the halogen-doped Bi 6 Cu 2 Se 4 O 6 possesses n-type conducting transports, which can be improved via Br/Cl doping. Compared with BiCuSeO and Bi 2 O 2 Se, an extremely low thermal conductivity can be observed in Bi 6 Cu 2 Se 4 O 6. To reveal the origin of low thermal conductivity, elastic properties, sound velocity, Grüneisen parameter, and Debye temperature are evaluated. Importantly, the calculated phonon mean free path of Bi 6 Cu 2 Se 4 O 6 is comparable to the interlayer distance for BiO─CuSe and BiO─Se layers, which is ascribed to the strong interlayer phonon scattering. Contributing from the outstanding low thermal conductivity and improved electrical transport properties, the maximum ZT ≈0.15 at 823 K and ≈0.11 at 873K are realized in n-type Bi 6 Cu 2 Se 3.2 Br 0.8 O 6 and Bi 6 Cu 2 Se 3.6 Cl 0.4 O 6 , respectively, indicating the promising thermoelectric performance in n-type Bi 6 Cu 2 Se 4 O 6 oxyselenides.

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Grain Boundaries Softening Thermoelectric Oxide BiCuSeO

Cited by 10 publications

References 31 publications

Recent Advances of Layered Thermoelectric Materials

Recent Advances of Layered Thermoelectric Materials

Manipulating the Solubility of SnSe in SnTe by Br Doping for Improving the Thermoelectric Performance

Electrical and Thermal Transport Properties of n‐type Bi₆Cu₂Se₄O₆ (2BiCuSeO + 2Bi₂O₂Se)

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Grain Boundaries Softening Thermoelectric Oxide BiCuSeO

Cited by 10 publications

References 31 publications

Recent Advances of Layered Thermoelectric Materials

Recent Advances of Layered Thermoelectric Materials

Manipulating the Solubility of SnSe in SnTe by Br Doping for Improving the Thermoelectric Performance

Electrical and Thermal Transport Properties of n‐type Bi6Cu2Se4O6 (2BiCuSeO + 2Bi2O2Se)

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Electrical and Thermal Transport Properties of n‐type Bi₆Cu₂Se₄O₆ (2BiCuSeO + 2Bi₂O₂Se)