Thermal stability of Ag9GaSe6 and its potential as a functionally graded thermoelectric material

Qi, Xingyue; Chen, Jing; Guo, Kai; He, Shiyang; Yang, Jiong; Li, Zhili; Xing, Juanjuan; Hu, Jianfeng; Luo, Hongjie; Zhang, Wenqing; Luo, Jun

doi:10.1016/j.cej.2019.05.179

Cited by 44 publications

(47 citation statements)

References 32 publications

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“…The key challenge for enhancing the performance of TE materials is establishing a balance between their property indicators in the equation describing their dimensionless figure of merit ( zT ) value (Equation (1)): [ 1,2 ]

\begin{matrix} z T = S^{2} σ κ^{- 1} T \end{matrix}

where S , σ, κ , and T are the Seebeck coefficient, electrical conductivity, total thermal conductivity, and absolute temperature, respectively. The total thermal conductivity comprises the contributions [ 3 ] the from lattice vibrations (κ l ) and charger carriers (κ e ) and can be expressed by κ = κ l + κ e . High zT values require a high power factor ( S 2 σ, PF) and a low total thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

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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\begin{matrix} z T = S^{2} σ κ^{- 1} T \end{matrix}

Section: Introductionmentioning

confidence: 99%

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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“…The first compound of the argyrodite family, for which thermoelectric properties were presented, is Cu 7 PSe 6 [16]. This led to the fact that the greatest amount of information concerns the study of selenium-containing compounds with the argyrodite structure: Cu 8 GeSe 6 and Ag 8 GeSe 6 [17,18], Ag 9 GaSe 6 [19], Cu 7 PSe 6 [20,21]. However, the investigations of S −2 ↔ Se −2 [22] [17].…”

Section: Introductionmentioning

confidence: 99%

Electrical Conductivity and Thermoelectrical Parameters of Argyrodite-Type Cu7 – xPS6 – xIx Mixed Crystals

Погодін¹,

Luchynets²,

Filep³

et al. 2021

Ukr. J. Phys.

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Cu7−xPS6−xIx mixed crystals were grown by the direct crystallization from a melt. The electrical conductivity is measured in the frequency range from 10 Hz to 300 kHz and in the temperature interval 293–383 K. The frequency, temperature, and compositional dependences of the electrical conductivity for Cu7−xPS6−xIx mixed crystals are studied. The measurements of thermoelectric parameters of Cu7−xPS6−xIx mixed crystals are carried out in the temperature interval 293–383 K. The compositional behaviors of the electrical conductivity, activation energy, Seebeck coefficient, and power factor are investigated. The interrelation between the structural, electrical, and thermoelectrical properties is analyzed.

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“…In addition, the heat flux in modern systems has passed the threshold of 500 W/cm 2 ; therefore, air‐based heat sinks are not adequate for removing the thermal load again 2 . In contrast, the recent development of functionally graded materials could effectively help in removing hotspots in high heat flux devices; however, its adoption has been limited due to its astronomical cost 3‐5 . In the last couple of decades, the use of liquid cooling has gained considerable attention 6‐9 .…”

Section: Introductionmentioning

confidence: 99%

“…2 In contrast, the recent development of functionally graded materials could effectively help in removing hotspots in high heat flux devices; however, its adoption has been limited due to its astronomical cost. [3][4][5] In the last couple of decades, the use of liquid cooling has gained considerable attention. [6][7][8][9] Similarly, the recent emergence of other cooling technologies, such as microchannel heat sink (MCHS), 10 improved heat transfer fluid (nanofluids), 11 and flow boiling heat transfer 12 has exhibited substantial impressions on a separate basis.…”

Section: Introductionmentioning

confidence: 99%

Thermohydraulic and entropy characteristics of Al₂O₃‐water nanofluid in a ribbed interrupted microchannel heat exchanger

et al. 2020

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In this study, an interrupted microchannel heat sink with rib turbulators was studied for its thermohydraulic effectiveness and entropy generation in a compact space. The rib edges are modified to enhance the overall functioning of the system by reducing the pressure drop. The working fluid used was Al2O3‐water nanofluid, and increasing the Reynolds number and nanoparticle concentration triggered a reduction in the heat sink's maximum temperature. These also offer a decrease in resistance to heat transfer, and there is an improvement in the evenness of the temperature of the interrupted microchannel heat sink, as regions with the likelihood of hot spot reduced drastically. At Re = 100, increasing the nanoparticle concentration from 0% to 4% enhanced the heat transfer coefficient by 38.41% for the interrupted microchannel heat sink‐base (IMCH‐B) configuration. Under similar conditions, the convective heat transfer coefficient for the interrupted microchannel heat sink‐fillet (IMCH‐F) increased by 43.69%. Furthermore, at 0.5% concentration, changing the Reynolds number from 100 to 700 augmented the heat transfer coefficient by 70.65%. Thus, the maximum temperature of the substrate's bottom surface was reduced by 53.83°C when the system was operated at Re = 700 and nanoparticle concentration of 4%. The IMCH‐C also showed relatively close results at all observed volume fractions. For the IMCH‐C, the maximum temperature of the bottom surface was reduced by 41.98°C at Re = 700 when compared with Re = 100% and 4% concentration. Although at high Reynolds numbers and concentrations, the pressure drops are higher, the performance enhancement criteria prove that the nanofluid is superior to water and the edge modifications show significant performance improvement. More importantly, the IMCH‐F heat sink showed the optimum performance based on the performance evaluation criteria at Re = 300 and φ=2% (ie, at this point, the heat transfer coefficient is maximum and the pressure drop is minimum). On the other hand, the optimal thermodynamic performance was observed at Re = 700 and φ=4%. The numerical results demonstrated a potential way to exploit nano‐suspensions for thermal applications, especially for high‐energy flux systems with compact space constraints.

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Thermal stability of Ag9GaSe6 and its potential as a functionally graded thermoelectric material

Cited by 44 publications

References 32 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

Electrical Conductivity and Thermoelectrical Parameters of Argyrodite-Type Cu7 – xPS6 – xIx Mixed Crystals

Thermohydraulic and entropy characteristics of Al₂O₃‐water nanofluid in a ribbed interrupted microchannel heat exchanger

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Thermal stability of Ag9GaSe6 and its potential as a functionally graded thermoelectric material

Cited by 44 publications

References 32 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

Electrical Conductivity and Thermoelectrical Parameters of Argyrodite-Type Cu7 – xPS6 – xIx Mixed Crystals

Thermohydraulic and entropy characteristics of Al2O3‐water nanofluid in a ribbed interrupted microchannel heat exchanger

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Product

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Thermohydraulic and entropy characteristics of Al₂O₃‐water nanofluid in a ribbed interrupted microchannel heat exchanger