Influence of multi-walled carbon nanotubes on the thermoelectric properties of La-filled CoSb3 skutterudite composites

Che, Ping; Wang, Beibei; Sun, Changyin; Han, Ya-jie; Li, Wenjun

doi:10.1016/j.jallcom.2016.11.024

Cited by 15 publications

(4 citation statements)

References 18 publications

(13 reference statements)

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“…The electron is not easy to be scattered because of the size of the nanoscale second-phase is much larger than the mean free path of the electron, which has little effect on the electrical properties. The preparation of CoSb 3 -based nanocomposites by in-situ generation [78,[167][168][169][170][171][172][173][174][175][176][177] or mechanical addition of nanoinclusions [178][179][180][181][182][183][184][185][186][187][188][189][190][191][192][193] is a common method to introduce the second phase. In x Ce y Co 4 Sb 12 nanocomposites containing in-situ formed InSb nanophases (10-80 nm) were prepared by melt quenching, annealing, and spark plasma sintering [78], as shown in Figs.…”

Section: Low Dimensionalmentioning

confidence: 99%

A review of CoSb3-based skutterudite thermoelectric materials

et al. 2020

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The binary skutterudite CoSb3 is a narrow bandgap semiconductor thermoelectric (TE) material with a relatively flat band structure and excellent electrical performance. However, thermal conductivity is very high because of the covalent bond between Co and Sb, resulting in a very low ZT value. Therefore, researchers have been trying to reduce its thermal conductivity by the different optimization methods. In addition, the synergistic optimization of the electrical and thermal transport parameters is also a key to improve the ZT value of CoSb3 material because the electrical and thermal transport parameters of TE materials are closely related to each other by the band structure and scattering mechanism. This review summarizes the main research progress in recent years to reduce the thermal conductivity of CoSb3-based materials at atomic-molecular scale and nano-mesoscopic scale. We also provide a simple summary of achievements made in recent studies on the non-equilibrium preparation technologies of CoSb3-based materials and synergistic optimization of the electrical and thermal transport parameters. In addition, the research progress of CoSb3-based TE devices in recent years is also briefly discussed.

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Section: Low Dimensionalmentioning

confidence: 99%

A review of CoSb3-based skutterudite thermoelectric materials

et al. 2020

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“…Changing trend of the total thermal conductivity and lattice thermal conductivity in C60 composite samples with different concentrations x C 60 -SKD ( x = 0, 0.05, 0.10, and 0.20); (a,b) with temperature; (c) comparison between the total thermal conductivity of different skutterudite composites (1: 1.0 wt % MWCNTs-La 0.3 Co 4 Sb 12 , 2: 4.43 mass % C 60 –Ba 0.44 Co 4 Sb 12 , 3: 6.54 mass % C 60 -Co 4 Sb 12 , 4: 1.40 vol % rGO-Ce 0.85 Fe 3 Co 4 Sb 12 , 5: G-La 0.8 Ti 0.1 Ga 0.1 Fe 3 CoSb 12 , 6: this work: 0.20C 60 -SKD) (MWCNTs: multiwalled carbon nanotubes, G: graphene, rGO: reduced graphite oxide, this work: 0.20C 60 -SKD). ,,− …”

Section: Resultsmentioning

confidence: 99%

Collaborative Optimization of Thermal Properties of S_0.05Co₄Sb_11.6Te_0.4 through the High-Pressure and High-Temperature Method and C₆₀ Composite

Chen,

Fan,

et al. 2023

ACS Appl. Energy Mater.

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Thermoelectric materials, as clean energy materials, can directly convert thermal energy into electrical energy. These materials have received significant attention owing to their environmentally friendly nature. Skutterudite thermoelectric materials feature excellent electrical properties and great potential for environmentally friendly and industrial applications. The thermal performance optimization of skutterudite is mainly achieved through framework atom substitution, lattice void filling, and recombination of nano second-phase. In this study, the significant optimization of the thermal properties of S0.05Co4Sb11.6Te0.4 with fullerene-C60 as a nano second-phase composite material was reported. At 773 K, the N-type 0.10C60-S0.05Co4Sb11.6Te0.4 (0.10C60-SKD) polycrystalline material featured a dimensionless figure of merit zT value of 1.34, which is 31% higher than that of the matrix material. The overall optimization of the thermoelectric properties of the material was achieved through the high-pressure and high-temperature (HPHT) synthesis method, combined with electronegative S element filling, Te element substitution, and the recombination of C60 nano second-phase. The experimental results indicated that the incorporation of C60 resulted in the formation of finer grains in the composite material with significant lattice distortion, dislocations, and abundant grain boundaries in its microstructure. Various phonon scattering mechanisms occurred within the material, effectively reducing the lattice thermal conductivity of the material. The stable structure of C60 molecules added to the matrix material can optimize the mechanical properties of the material. The composite sample with a C60 amount of 0.20 exhibited a Vickers hardness of 7.01(1) GPa. This study employed the HPHT method for the direct synthesis of C60 composite samples within 30 min and provides insights into improving the thermoelectric properties of skutterudite.

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“…Comparison of total thermal conductivities before and after dispersing CNTs into different TE materials at 300 K. [ 171,172,174,178–180,187–199 ] …”

Section: Discontinuous Interface Modificationmentioning

confidence: 99%

“…a) Comparison of electrical conductivity and Seebeck coefficient before and after dispersing CNTs into different TE materials at 300 K. [ 171,172,174,178–180,187–199 ] b) Schematic diagram of electrically conductive paths under low (left) and high (right) CNTs content.…”

Section: Discontinuous Interface Modificationmentioning

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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Influence of multi-walled carbon nanotubes on the thermoelectric properties of La-filled CoSb3 skutterudite composites

Cited by 15 publications

References 18 publications

A review of CoSb3-based skutterudite thermoelectric materials

A review of CoSb3-based skutterudite thermoelectric materials

Collaborative Optimization of Thermal Properties of S_0.05Co₄Sb_11.6Te_0.4 through the High-Pressure and High-Temperature Method and C₆₀ Composite

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

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Influence of multi-walled carbon nanotubes on the thermoelectric properties of La-filled CoSb3 skutterudite composites

Cited by 15 publications

References 18 publications

A review of CoSb3-based skutterudite thermoelectric materials

A review of CoSb3-based skutterudite thermoelectric materials

Collaborative Optimization of Thermal Properties of S0.05Co4Sb11.6Te0.4 through the High-Pressure and High-Temperature Method and C60 Composite

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

Contact Info

Product

Resources

About

Collaborative Optimization of Thermal Properties of S_0.05Co₄Sb_11.6Te_0.4 through the High-Pressure and High-Temperature Method and C₆₀ Composite