Structure and thermoelectric properties of bismuth telluride—Carbon composites

Trawiński, Bartosz; Bochentyn, Beata; Gostkowska, N.; Łapiński, Marcin; Miruszewski, Tadeusz; Kusz, B.

doi:10.1016/j.materresbull.2017.10.043

Cited by 15 publications

(9 citation statements)

References 39 publications

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“…The bulk of research in the past decade has focused on mechanically mixed and fabricated composites of bismuth-and antimony-based chalcogenides and FWCNTs or MWCNTs, [414][415][416][417]419,421 with examples of bismuth-antimony telluride composites achieving a material zT of >1.0. 419,421 Several studies have demonstrated that the incorporation of small quantities of MWCNT "nanoinclusions" (<0.25 wt %) in Bi 2 (Te 0.9 Se 0.1 ) 3 414 or (Bi 0.2 Sb 0.8 ) 2 Te 3 419,421 (see Figure 48) can reduce the thermal conductivity to less that 1 W m −1 K −1 at room temperature due to a phonon mismatch between the two components and a concomitant reduction in the phonon thermal conductivity.…”

Section: Carbon Nanomaterialsmentioning

confidence: 99%

Unconventional Thermoelectric Materials for Energy Harvesting and Sensing Applications

et al. 2021

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Heat is an abundant but often wasted source of energy. Thus, harvesting just a portion of this tremendous amount of energy holds significant promise for a more sustainable society. While traditional solid-state inorganic semiconductors have dominated the research stage on thermal-to-electrical energy conversion, carbon-based semiconductors have recently attracted a great deal of attention as potential thermoelectric materials for low-temperature energy harvesting, primarily driven by the high abundance of their atomic elements, ease of processing/manufacturing, and intrinsically low thermal conductivity. This quest for new materials has resulted in the discovery of several new kinds of thermoelectric materials and concepts capable of converting a heat flux into an electrical current by means of various types of particles transporting the electric charge: (i) electrons, (ii) ions, and (iii) redox molecules. This has contributed to expanding the applications envisaged for thermoelectric materials far beyond simple conversion of heat into electricity. This is the motivation behind this review. This work is divided in three sections. In the first section, we present the basic principle of the thermoelectric effects when the particles transporting the electric charge are electrons, ions, and redox molecules and describe the conceptual differences between the three thermodiffusion phenomena. In the second section, we review the efforts made on developing devices exploiting these three effects and give a thorough understanding of what limits their performance. In the third section, we review the state-of-the-art thermoelectric materials investigated so far and provide a comprehensive understanding of what limits charge and energy transport in each of these classes of materials.

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Section: Carbon Nanomaterialsmentioning

confidence: 99%

Unconventional Thermoelectric Materials for Energy Harvesting and Sensing Applications

et al. 2021

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“…Synthesis of porous thermoelectric materials such as Bi 2 Te 3 [27][28][29], (Bi,Sb) 2 Te 3 [29][30][31], Ge 0.77 Ag 0.1 Sb 0.13 Te (TAGS) [32], Bi 2 Te 1-x Se x [33,34] and CsBi 4-Te 6 [35] via this technique has been previously reported. In this method, a mixture of oxides is reduced at a given temperature in a dry hydrogen flow.…”

Section: Graphic Abstract Introductionmentioning

confidence: 99%

New synthesis route of highly porous InxCo4Sb12 with strongly reduced thermal conductivity

et al. 2020

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Highly porous, In-filled CoSb 3 skutterudite materials with an attractive thermoelectric figure of merit (ZT * 1) and corresponding dense samples were fabricated through the cost-effective method of reduction in oxides in dry hydrogen and the pulsed electric current sintering (PECS) method, respectively. The reduction process was described in detail using in situ thermogravimetric analysis of Co 2 O 3 , Sb 2 O 3 and In(NO 3) 3 Á5H 2 O separately and in a mixture. Two methods to synthesise the same material were examined: (a) free sintering of an initially reduced powder and (b) PECS. The free-sintered materials with higher porosities (up to * 40%) exhibited lower values of electrical conductivity than the dense PECS samples (porosity up to * 5%), but the benefit of an even sixfold reduction in thermal conductivity resulted in higher ZT values. The theoretical values of thermal conductivity for various effective media models considering randomly oriented spheroid pores are in good agreement with the experimental thermal conductivity data. The assumed distribution and shape of the pores correlated well with the scanning electron microscope analysis of the microstructure. The lowest value of thermal conductivity, equal to 0.5 W/m K, was measured at 523 K for In 0.1 Co 4 Sb 12 with 41% porosity. The highest value of ZT max = 1.0 at 673 K was found for the In 0.2 Co 4 Sb 12 sample in which the porosity was 36%.

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“…The impedance mismatch between the PbTe and PbS rich phases in (Pb 0.95 Sn 0.05 Te) 1−x (PbS) x samples led to an inhibition of the heat flow, with the lattice thermal conductivity reaching 0.4 W•m −1 •K −1 for the sample with 8% PbS, an 80% reduction in the reported values for the bulk material [169]. In general, phonon scattering has proven to be an effective strategy to reduce the lattice thermal conductivity in multiphase lead telluride-based materials [170][171][172][173] and bismuth telluride-based [174][175][176] materials. For instance, nano-engineered multiphase PbTe-x% InSb compounds showed an exceptionally low minimum lattice thermal conductivity of ~0.3 W•m −1 •K −1 at ~770 K for 4% InSb and consequently a zT value of ~1.83 at 770 K [177].…”

Section: Phonon Scatteringmentioning

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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Structure and thermoelectric properties of bismuth telluride—Carbon composites

Cited by 15 publications

References 39 publications

Unconventional Thermoelectric Materials for Energy Harvesting and Sensing Applications

Unconventional Thermoelectric Materials for Energy Harvesting and Sensing Applications

New synthesis route of highly porous InxCo4Sb12 with strongly reduced thermal conductivity

Recent Progress in Multiphase Thermoelectric Materials

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