JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2021
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IF 5.302
Peng-an Zong,Zhengdong Mao,Yixiang Ou,Taifeng Shi,Zhiweng Wang,Qihao Zhang,Peng Zhang,Chunlei Wan
Filling the icosahedral lattice holes of the cage-compound CoSb 3 with alkali, alkaline-earth and rare-earth metal atoms can endow CoSb 3 with the transport characteristic of "phonon-glass-electron-crystal". However, the filler atoms greatly increase the cost in raw material as well as fabrication complexity. In this work, we embedded FeCl 3 -intercalated graphene nanolayers into polycrystalline CoSb 3 by a solution-dispersion method combined with spark plasma sintering technology. The graphene nanosheets were mainly distributed in grain boundaries. Due to the increased carrier concentration and mobility, the electrical conductivity was improved. Meanwhile, due to the enhanced interfacial phonon scattering, the lattice thermal conductivity was effectively suppressed. The thermoelectric figure of merit of the nanocomposite reached 0.6 at a mass content of 0.2 % FeCl 3 -intercalated graphene nanolayers, outperforming all reported values of binary CoSb 3 based nanocomposites, and even comparable to that of commercially used filled p-type Fe 3 CoSb 12 . This work provides a promising strategy for low-cost fabrication of p-type skutterudites.
研究领域:
材料科学
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能源材料
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2025
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IF 6.2
Xin Fan,Xiaoqin Tian,Jianxin Chi,Jiao Zhao,Youjin Zheng,Fangbiao Wang,Lei Zhang,Qi Chen,Hongan Ma
In this paper, the electropositive-electronegative double-filled skutterudite, which is challenging or impossible to synthesize via conventional methods, was successfully prepared using a high-pressure and high-temperature (HPHT) method. The successful filling of Ba-S into the voids of the CoSb 3 crystal structure was confirmed through X-ray diffraction, enthalpy of formation calculations, and EDS spectral analysis. The experimental results indicate that the skutterudite material with porous structure has a lower thermal conductivity of 1.07 W m −1 K −1 at 773 K. The Callaway model fitting analysis revealed that the introduction of Ba, S, and Te enhances both point defect scattering and resonance scattering, thereby effectively reducing the lattice thermal conductivity Consequently, the sample achieves a maximum zT value of 1.44 at 773 K. This work provides novel insights into the study of thermoelectric properties in skutterudite materials.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2017
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IF 2.299
L. Deng,Jing Ni,J.M. Qin,X.P. Jia
Nano-particle and defect have been proved to be effective in depressing the lattice thermal conductivity and improving the performance of thermoelectric materials . In this work, In 0.5 Sn x Co 4 Sb 12 were prepared using a high pressure and high temperature (HPHT) method, In and Sn was assumed that In plays the role of a filler and occupies the Sb-icosahedron voids. Doping of In and Sn results in the defects, nanostructuring, and mesoscale structuring were all combined into a single skutterudite matrix. The thermoelectric properties were measured in the temperature range of 321–710 K. As expected, with the synthetic pressures increased，the thermal conductivity of samples improved significantly. The minimum value of In 0.5 Sn 0.4 Co 4 Sb 12 synthesized at 3.8 GPa is 1.79 Wm −1 K −1 and the highest Seebeck coefficient of sample In 0.5 Sn 0.2 Co 4 Sb 12 synthesized at 2.8 GPa reached 222 μV K −1 finally.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materiomics
·
2021
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IF 6.425
Z. Sun,X. Chen,Juncheng Zhang,Huiyuan Geng,L.X. Zhang
Skutterudite (SKD) thermoelectric materials have high conversion efficiency, great mechanical properties, and economical practicability in the medium temperature range (500–550 °C). They need to be joined with metal electrodes to form a thermoelectric power generation device during application. However, high contact resistivity, severe element diffusion, and large coefficient of thermal expansion mismatch are main obstacles for their applications. To address these issues, a FeCoNiCrMo high-entropy alloy diffusion barrier layer was designed and prepared using an arc smelting method in this paper. Effect of heating temperatures on the microstructure and properties of the bonded joints were investigated. The maximum shear strength was 21.6 Mpa and the corresponding reaction layer thickness, contact resistivity were 3.77 μm, 1.8 μΩcm 2 respectively at 600 °C, 40 MPa, 10 min. Shear strength dropped down to 18.8 MPa and the contact resistivity increased to 4.2 μΩ cm 2 after aging for 640 h. Numerical model was established and it predicted that the contact resistivity would keep lower than 6.5 μΩ cm 2 (300 h, 100 days) and 11 μΩ cm 2 (8760 h, 1 year) and the reaction layer thickness would not exceed 25 μm (2400 h, 100 days) and 45 μm (8760 h, 1 year).
研究领域:
材料科学
·
热电技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）