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Advanced Materials and Modules for Thermoelectric Energy Conversion
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Advanced Materials and Modules for Thermoelectric Energy Conversion

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Energy Materials".

Deadline for manuscript submissions: closed (20 July 2022) | Viewed by 5258

Special Issue Editor

Prof. Dr. Bertrand Lenoir

E-Mail Website
Guest Editor
Institut Jean Lamour, UMR 7198 CNRS, Université de Lorraine, Parc de Saurupt, CS 50840, 54011 Nancy, France
Interests: thermoelectric materials; electrical properties; thermal properties; small-band gap semiconductors; thermoelectric conversion
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Many research efforts are currently underway to identify novel families of materials or to propose new strategies either for modulating electronic band structure or enhancing phonon scattering—the final goal being to achieve higher thermoelectric performance. Steady progress is also observed in the development of thermoelectric modules. Works to integrate advanced materials in uni-legs or segmented legs are in permanent advancement while innovative architectures have also been proposed.

The main purpose of this issue is to provide an overview of the current research trends in thermoelectric materials and modules. We invite researchers to enrich our knowledge in understanding the physics and chemistry of advanced thermoelectric materials and to design innovative modules for cooling or power electrical generation, by providing review articles as well as original papers. Thus, this Special Issue of Materials will cover, but will not be limited to, the following topics:

  • Inorganic/organic thermoelectric materials;
  • Nanostructured thermoelectric materials;
  • New concepts/approaches to boost the thermoelectric performance;
  • Thermoelectric modules (design, modelling, protection).

Prof. Dr. Bertrand Lenoir
Guest Editor

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Keywords

  • thermoelectric materials
  • thermoelectric modules
  • electrical properties
  • thermal properties
  • energy harvesting
  • power generation
  • cooling

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Published Papers (3 papers)

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Research

33 pages, 7297 KiB  
Article
International Round Robin Test of Thermoelectric Generator Modules
by Pawel Ziolkowski, Przemyslaw Blaschkewitz, Byungki Ryu, SuDong Park and Eckhard Müller
Materials 2022, 15(5), 1627; https://doi.org/10.3390/ma15051627 - 22 Feb 2022
Cited by 9 | Viewed by 2782
Abstract
The status of metrology for the characterization of thermoelectric generator modules (TEM) is investigated in this work by an international round robin (RR) test including twelve laboratories from nine countries on three continents. Measurements have been performed with three samples of a Bi [...] Read more.
The status of metrology for the characterization of thermoelectric generator modules (TEM) is investigated in this work by an international round robin (RR) test including twelve laboratories from nine countries on three continents. Measurements have been performed with three samples of a Bi2Te3-based commercial TEM type, which has prevailed over three competing types during previous tests on the short- and long-term stability. A comparison of temperature-dependent results is provided up to 200 °C hot side temperature for the maximum power output Pmax, the incident heat flow Q˙In (at maximum efficiency conditions), and the maximum efficiency ηmax. Data evaluation from all RR participants reveals maximum standard deviations for these measurands of 27.2% (Pmax), 59.2% (Q˙In), and 25.9% (ηmax). A comparison between RR data sets and reference data from manufacturer specifications shows high deviations of up to 46%, too. These deviations reflect the absence of measurement guidelines and reference samples and confirm the need for improvements in the standardization of TEM metrology. Accordingly, the results of the RR are presented against the background of our own investigations on the uncertainty budgets for the determination of the abovementioned TEM properties using inhouse-developed characterization facilities, which comprise reference and absolute measurement techniques for the determination of heat flow. Full article
(This article belongs to the Special Issue Advanced Materials and Modules for Thermoelectric Energy Conversion)
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16 pages, 4875 KiB  
Article
Phase Analysis and Thermoelectric Properties of Cu-Rich Tetrahedrite Prepared by Solvothermal Synthesis
by Karolina Zazakowny, Artur Kosonowski, Adrianna Lis, Oleksandr Cherniushok, Taras Parashchuk, Janusz Tobola and Krzysztof T. Wojciechowski
Materials 2022, 15(3), 849; https://doi.org/10.3390/ma15030849 - 23 Jan 2022
Cited by 11 | Viewed by 3374
Abstract
Because of the large Seebeck coefficient, low thermal conductivity, and earth-abundant nature of components, tetrahedrites are promising thermoelectric materials. DFT calculations reveal that the additional copper atoms in Cu-rich Cu14Sb4S13 tetrahedrite can effectively engineer the chemical potential towards [...] Read more.
Because of the large Seebeck coefficient, low thermal conductivity, and earth-abundant nature of components, tetrahedrites are promising thermoelectric materials. DFT calculations reveal that the additional copper atoms in Cu-rich Cu14Sb4S13 tetrahedrite can effectively engineer the chemical potential towards high thermoelectric performance. Here, the Cu-rich tetrahedrite phase was prepared using a novel approach, which is based on the solvothermal method and piperazine serving both as solvent and reagent. As only pure elements were used for the synthesis, the offered method allows us to avoid the typically observed inorganic salt contaminations in products. Prepared in such a way, Cu14Sb4S13 tetrahedrite materials possess a very high Seebeck coefficient (above 400 μVK−1) and low thermal conductivity (below 0.3 Wm−1K−1), yielding to an excellent dimensionless thermoelectric figure of merit ZT ≈ 0.65 at 723 K. The further enhancement of the thermoelectric performance is expected after attuning the carrier concentration to the optimal value for achieving the highest possible power factor in this system. Full article
(This article belongs to the Special Issue Advanced Materials and Modules for Thermoelectric Energy Conversion)
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18 pages, 490 KiB  
Article
Composites to Produce a Material with Zero Absolute Thermopower S = 0 or a Thermopower Switch between S = 0 and S ≠ 0
by Joachim Sonntag and Bertrand Lenoir
Materials 2021, 14(19), 5529; https://doi.org/10.3390/ma14195529 - 24 Sep 2021
Viewed by 1650
Abstract
From the theory of two-phase composites it is concluded that in the concentration dependence of the Seebeck coefficient S a kink can occur precisely at S=0 absolute if the two phases have different kinds of carriers, electrons and holes, and if [...] Read more.
From the theory of two-phase composites it is concluded that in the concentration dependence of the Seebeck coefficient S a kink can occur precisely at S=0 absolute if the two phases have different kinds of carriers, electrons and holes, and if the phase grains are spherical without preferred orientations and arranged in a symmetrical fashion. This feature, indeed found to be realized in amorphous Cr1−xSix thin films deposited by ion beam sputtering from Cr-Si alloy targets, can be applied to make reference standards for S=0 at room temperature and even at higher temperatures. Additionally, it may be used to design a thermopower switch between S=0 and S≠0. It is also concluded that the structure realized in any alloy during solidification does not only depend on the diffusion mobility of the atoms and on the existence of a (relative) minimum in the Gibbs’ free energy. It depends also on the fact whether this structure is compatible with the demand that (spatial) continuity of the entropy and energy flux densities and their gradients is saved during the solidification process. Full article
(This article belongs to the Special Issue Advanced Materials and Modules for Thermoelectric Energy Conversion)
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