Nanostructured State-of-the-Art Thermoelectric Materials Prepared by Straight-Forward Arc-Melting Method

Serrano‐Sánchez, Federico; Gharsallah, M.; Bermúdez, J.; Carrascoso, Félix; Nemes, N. M.; Durá, O. J.; Torre, Marco A. Lópezde la; Martínez, José Luis; Fernández‐Díaz, M. T.

doi:10.5772/65115

Cited by 4 publications

(7 citation statements)

References 56 publications

(97 reference statements)

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“…The principles and main procedures of the melting and solid-state reaction routes have been discussed in Section 4.1. For the arc-melting route [88,253], it is different from the traditional melting route, because the heats for arc-melting are provided through an electric arc [254]. The precursors are directly exposed to the electric arc, and the current in the furnace terminals passes through the charged precursors.…”

Section: Synthesis Of Productmentioning

confidence: 99%

High-performance SnSe thermoelectric materials: Progress and future challenge

Chen

Zhao

Zou

2018

Progress in Materials Science

439

397

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Thermoelectric materials offer an alternative opportunity to tackle the energy crisis and environmental problems by enabling the direct solid-state energy conversion. As a promising candidate with full potentials for the next generation thermoelectrics, tin selenide (SnSe) and its associated thermoelectric materials have been attracted extensive attentions due to their ultralow thermal conductivity and high electrical transport performance (power factor). To provide a thorough overview of recent advances in SnSe-based thermoelectric materials that have been revealed as promising thermoelectric materials since 2014, here, we first focus on the inherent relationship between the structural characteristics and the supreme thermoelectric performance of SnSe, including the thermodynamics, crystal structures, and electronic structures. The effects of phonon scattering, pressure or strain, and oxidation behavior on the thermoelectric performance of SnSe are discussed in detail. Besides, we summarize the current theoretical calculations to predict and understand the thermoelectric performance of SnSe, and provide a comprehensive summary on the current synthesis, characterization, and thermoelectric performance of both SnSe crystals and polycrystals, and their associated materials. In the end, we point out the controversies, challenges and strategies toward future enhancements of the SnSe thermoelectric materials.

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Section: Synthesis Of Productmentioning

confidence: 99%

High-performance SnSe thermoelectric materials: Progress and future challenge

Chen

Zhao

Zou

2018

Progress in Materials Science

439

397

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“…The power factor reaches a maximum of 0.5 mW/mK 2 at around 800 K. As we will show below and have published before [36][37][38][39], the thermal conductivity for SnSe alloys produced by arc-melting is less than 0.5 W/mK, indicating a possible figure of merit zT > 0.8 for Sn 0.9 Y 0.1 Se.…”

Section: Sn 09 Y 01 Sementioning

confidence: 71%

“…It may correspond to the abovementioned defect band. Another possibility is that the electrical conductivity, invariably poor in arc-melting produced SnSe, and its alloys, at room temperature [36][37][38][39], is limited by intergrain hopping with activation energy of around 0.2 eV.…”

Section: Sn 09 Y 01 Sementioning

confidence: 99%

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Nanostructured Thermoelectric Chalcogenides

Gainza¹,

Serrano‐Sánchez²,

Gharsallah³

et al. 2018

Bringing Thermoelectricity Into Reality

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Thermoelectric materials are outstanding to transform temperature differences directly and reversibly into electrical voltage. Exploiting waste heat recovery as a source of power generation could help towards energy sustainability. Recently, the SnSe semiconductor was identified, in single-crystal form, as a mid-temperature thermoelectric material with record high figure of merit, high power factor and surprisingly low thermal conductivity. We describe the preparation of polycrystals of alloys of SnSe obtained by arc-melting; a rapid synthesis that results in strongly nanostructured samples with low thermal conductivity, advantageous for thermoelectricity, approaching the amorphous limit, around 0.3-0.5 W/mK. An initial screening of novel samples Sn 1−x M x Se, by alloying with 3d and 4d transition metals such as M = Mn, Y, Ag, Mo, Cd or Au, provides for a means to optimize the power factor. M=Mo, Ag, with excellent values, are described in detail with characterization by x-ray powder diffraction (XRD), scanning electron microscopy (SEM), and electronic and thermal transport measurements. Rietveld analysis of XRD data demonstrates near-perfect stoichiometries of the above-mentioned alloys. SEM analysis shows stacking of nanosized sheets, with large surfaces parallel to layered slabs. An apparatus was developed for the simultaneous measurement of the Seebeck coefficient and electric conductivity at elevated temperatures.

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“…For the arc-melting route, 25,165 it is different from the traditional melting route, because the heats for arc-melting are provided through an electric arc. 166 The precursors are directly exposed to the electric arc, and the current in the furnace terminals passes through the charged precursors. In this regard, the arc-melting has a much higher heating speed than the traditional melting.…”

Section: Fabricationmentioning

confidence: 99%

Development of high-efficient tin selenide-based thermoelectric materials

Shi¹

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Thermoelectric materials can realize direct energy conversion from heat to electricity based on thermoelectric effects, thus have been considered as a green and sustainable solution to the global energy dilemma by harvesting electricity from waste heat or sunlight. The conversion efficiency can be expressed as ZT=S 2 σT/κ, where S is the Seebeck coefficient, σ is electrical conductivity, T is the absolute temperature, and κ is the thermal conductivity. To date, two major strategies for achieving high ZT are optimizing the power factor S 2 σ and reducing lattice thermal conductivity κl by band and structural engineering, respectively.However, the current commercial thermoelectric materials such as bismuth telluride (Bi2Te3)have their ZT values limited to <1.5, which have been the bottleneck challenge for their wider practical applications. In this regard, finding next generation thermoelectric systems with ZT ≥ 1.5 is urgently needed.Stannous mono-selenide (SnSe) has attracted much attention because of its great potential in realizing high-performance, low-toxic and low-cost thermoelectric devices. To achieve high performance in polycrystalline SnSe, three major strategies including doping, multi-phase alloying, and micro/nanoscale texturing, have been employed. The peak ZTs have been improved from ~0.5 to ~1.0, which are still much lower than their single crystal counterparts. XIV AcknowledgementsI sincerely acknowledge my supervisors, Professor Jin Zou and Professor Zhi-Gang Chen for their kind guidance to me during my Ph.D program in the University of Queensland. I am impressed by their significant excellence as scientific researchers, including their profound knowledge, critical thinking, fortified determination, patience, passion, and seriousness.Under their supervision, I have been a hard-working researcher with strong enthusiasm to research, and devoted by their clear vision for the research, I have become a strong creative thinker, and identify the reportable points that have potential to turn into scientific papers.

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Nanostructured State-of-the-Art Thermoelectric Materials Prepared by Straight-Forward Arc-Melting Method

Cited by 4 publications

References 56 publications

High-performance SnSe thermoelectric materials: Progress and future challenge

High-performance SnSe thermoelectric materials: Progress and future challenge

Nanostructured Thermoelectric Chalcogenides

Development of high-efficient tin selenide-based thermoelectric materials

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