Enhanced thermoelectric properties of nano SiC dispersed Bi2Sr2Co2Oy Ceramics

Hu, Qiujun; Wang, Kunlun; Zhang, Yingjiu; Li, Xinjian; Song, Hang

doi:10.1088/2053-1591/aabca8

Cited by 25 publications

(7 citation statements)

References 30 publications

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“…This behavior was attributed to the enhanced phonon scattering and reduced mean free path of the phonons, caused by the dispersion of SiC nanoparticles at the phase boundaries of the TE matrices. [ 133,135,142,160 ] Therefore, the feasibility of improving the zT value of TE materials by dispersing SiC nanoparticles, has been confirmed.…”

Section: Discontinuous Interface Modificationmentioning

confidence: 93%

Current State‐of‐the‐Art in the Interface/Surface Modification of Thermoelectric Materials

Lehmann

Bahrami

et al. 2021

Advanced Energy Materials

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Thermoelectric (TE) materials are prominent candidates for energy converting applications due to their excellent performance and reliability. Extensive efforts for improving their efficiency in single‐/multi‐phase composites comprising nano/micro‐scale second phases are being made. The artificial decoration of second phases into the thermoelectric matrix in multi‐phase composites, which is distinguished from the second‐phase precipitation occurring during the thermally equilibrated synthesis of TE materials, can effectively enhance their performance. Theoretically, the interfacial manipulation of phase boundaries can be extended to a wide range of materials. High interface densities decrease thermal conductivity when nano/micro‐scale grain boundaries are obtained and certain electronic structure modifications may increase the power factor of TE materials. Based on the distribution of second phases on the interface boundaries, the strategies can be divided into discontinuous and continuous interfacial modifications. The discontinuous interfacial modifications section in this review discusses five parts chosen according to their dispersion forms, including metals, oxides, semiconductors, carbonic compounds, and MXenes. Alternatively, gas‐ and solution‐phase process techniques are adopted for realizing continuous surface changes, like the core–shell structure. This review offers a detailed analysis of the current state‐of‐the‐art in the field, while identifying possibilities and obstacles for improving the performance of TE materials.

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Section: Discontinuous Interface Modificationmentioning

confidence: 93%

Current State‐of‐the‐Art in the Interface/Surface Modification of Thermoelectric Materials

Lehmann

Bahrami

et al. 2021

Advanced Energy Materials

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“…SiC added in whiskers and nanoinclusions form to synergistically enhance the mechanical stability by maintaining a ZT the same as the nanocomposite with SiC particles alone . Adding SiC to Bi 2 Sr 2 Co 2 O y shows simultaneous enhancement of all three parameters . The addition of coherent interfaced SiC nanoinclusions in the BiSbTe matrix improved all three thermoelectric parameters simultaneously …”

Section: Classification Of Nanoinclusionsmentioning

confidence: 97%

“…Other nanoinclusions such as SiC, ,,,,,,− InSb, ,,,− MXenes, , BN, and TiB 2 are used in thermoelectric composites.…”

Section: Classification Of Nanoinclusionsmentioning

confidence: 99%

“…SiC nanoinclusions reduce κ and enhance α, but their σ depends on the matrix and the concentration of the inclusions. Adding SiC nanoinclusions, a semiconductor with a bandgap of 3.25 eV, the σ of the composite may increase , or decrease , depending on the matrix carrier density and the concentration of SiC. Generally, SiC increases the density of the defects such as antisite and point defects at interfaces, enhancing the carrier density .…”

Section: Classification Of Nanoinclusionsmentioning

confidence: 99%

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Insights into the Classification of Nanoinclusions of Composites for Thermoelectric Applications

Theja

Karthikeyan

Assi

et al. 2022

ACS Appl. Electron. Mater.

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Thermoelectric composites are known for their enhanced power conversion performance via interfacial engineering and intensified mechanical, structural, and thermal properties. However, the selection of these nanoinclusions, for example, their type, size effect, volume fraction, distribution uniformity, coherency with host, carrier dynamics, and physical stability, plays a crucial role in modifying the host material thermoelectric properties. In this Review, we classify the nanoinclusions into five types: carbon allotropes, secondary thermoelectric phases, metallic materials, insulating oxides, and others. On the basis of the classification, we discuss the mechanisms involved in improving the ZT of nanocomposites involving reduction of thermal conductivity (κ) by phonon scattering, improving the Seebeck coefficient (α) via energy filtering effect and the electrical conductivity (σ) by carrier injection or carrier channeling. Comprehensibly, we validate that adding nanoinclusions with high electrical and low thermal conductivity as compared to the matrix material is the best way to optimize the interlocked thermoelectric parameters. Thus, collective doping and nanoinclusions in thermoelectric materials is the best possible solution to achieve a higher power conversion efficiency equivalent to other renewable energy technologies.

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“…The maximum value obtained for the Seebeck coefficient at 973 K was −156 µV/K, with an electrical conductivity of ~4 × 10 4 S/m. Silicon-based materials, although not common in thermoelectricity, have also been shown to benefit from energy filtering [103][104][105][106][107][108][109][110]. For instance, heavily doped Si with B with nanoparticles of Si has shown an increased Seebeck coefficient and electrical conductivity in a particular range of dopant concentrations [111].…”

Section: Energy Filtering By Semiconducting Secondary Phasesmentioning

confidence: 99%

Recent Progress in Multiphase Thermoelectric Materials

Fortulan

Yamini

2021

Materials

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Thermoelectric materials, which directly convert thermal energy to electricity and vice versa, are considered a viable source of renewable energy. However, the enhancement of conversion efficiency in these materials is very challenging. Recently, multiphase thermoelectric materials have presented themselves as the most promising materials to achieve higher thermoelectric efficiencies than single-phase compounds. These materials provide higher degrees of freedom to design new compounds and adopt new approaches to enhance the electronic transport properties of thermoelectric materials. Here, we have summarised the current developments in multiphase thermoelectric materials, exploiting the beneficial effects of secondary phases, and reviewed the principal mechanisms explaining the enhanced conversion efficiency in these materials. This includes energy filtering, modulation doping, phonon scattering, and magnetic effects. This work assists researchers to design new high-performance thermoelectric materials by providing common concepts.

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Enhanced thermoelectric properties of nano SiC dispersed Bi₂Sr₂Co₂O_y Ceramics

Cited by 25 publications

References 30 publications

Current State‐of‐the‐Art in the Interface/Surface Modification of Thermoelectric Materials

Current State‐of‐the‐Art in the Interface/Surface Modification of Thermoelectric Materials

Insights into the Classification of Nanoinclusions of Composites for Thermoelectric Applications

Recent Progress in Multiphase Thermoelectric Materials

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