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Methods for Calculating the Thermoelectric Characterizations of Nanomaterials
Published in Alexander V. Vakhrushev, Suresh C. Ameta, Heru Susanto, A. K. Haghi, Advances in Nanotechnology and the Environmental Sciences, 2019
A. V. Severyukhin, O. Yu. Severyukhina, A. V. Vakhrushev
Great progress in the field of creating and investigating the properties of nanostructured thermoelectric materials has been achieved in the last few decades. Thermoelectric nanostructures have a number of features. First, nanoscale objects have a special structure, which can lead to both a decrease in electric propulsion, and an increase in the value of the thermo-emf coefficient and figure of merit in comparison with the crystalline macro sample. The reason for this is the fact that in nanosystems, with increasing density of states near the Fermi level, the width of the band gap of a semiconductor increases. Second, there is a scattering of phonons by defects and interfaces. This leads to the fact that the decrease in heat conductivity occurs faster than the decrease in electrical conductivity.
Recent Advances in Graphene Metal Oxide Based Nanocomposite for Energy Harvesting/Thermoelectric Application
Published in Mahmood Aliofkhazraei, Advances in Nanostructured Composites, 2019
Thermoelectric materials are very useful for generation of electricity from unwanted heat, i.e., conversion of heat into electricity. The major challenge lies in the realistic approach that how a small variation of temperature on the environmental temperature can be effectively harvested. The transformation of waste heat to electricity by the TE system has been depicted schematically in Figure 1. The low efficiency of the existing TE devices is the remarkable shortcoming. If the efficiency of the TE using ZT can be amplified, these devices can be a viable solution of the TW energy problems. Therefore, development of efficiency or figure of merit is a vital issue in the allied areas of research. Hence, in this introduction chapter, our attempt is to offer a consolidated review of recent work on state-of-the-art thermoelectric composites.
Study of High-Temperature Oxidation Behavior of Antimony and Bismuth Tellurides by Thermopiezic Analysis and Powder X-Ray Diffraction: A Case Study of Thermochemistry
Published in Toshio Naito, Functional Materials, 2019
Thermoelectric materials have recently attracted a lot of attention since they are capable of generating electric power from waste-heat resources available in a wide range and on a large scale [1]. Thermoelectric devices work without causing environmental pollution, since they can directly convert heat energy to electric one, neither producing any waste materials such as exhaust gas nor emitting noise. More attention has been directed to the optimization of the thermoelectric performance of existing well-known materials and devices and to search for novel materials possessing a larger thermoelectric figure merit for various thermoelectric applications. In general, in using a thermoelectric device for thermoelectric generation, setting one of its ends (junctions of p- and n-type of thermoelectric materials) at a temperature as high as possible is very favorable for optimizing the performance of the thermoelectric generator since the conversion efficiency is given by the product of the Carnot efficiency and the device efficiency [2].
A review on the progress and development of thermoelectric air conditioning system
Published in International Journal of Green Energy, 2023
Manoj Sasidharan, Mohd Faizul Mohd Sabri, Sharifah Fatmadiana Wan Muhammad Hatta, Suriani Ibrahim
In recent years, the efficiency of thermoelectric devices has greatly improved thanks to geometrical improvements and thermoelectric materials. However, the efficiency of thermoelectric cooling is lower, hence further research is needed for improvements. To further improve the performance of thermoelectric cooling, various structures of thermoelectric devices have been reported. The improvement of thermoelectric performance was mainly demonstrated by segmenting different thermoelectric materials to form thermoelectric modules, designing an integrated thermoelectric device (iTED) with each alternating electrical and thermal connections in series and parallel, and introducing a thermal switch to reduce temperature fluctuations. Therefore, further structural improvements to thermoelectric cooling will be the subject of research advances to improve the overall efficiency and performance.
Thermoelectric materials developments: past, present, and future
Published in Science and Technology of Advanced Materials, 2021
Prof. Koumoto has made striking advancements in the development of environmental-friendly and earth-abundant thermoelectric materials. The classical high-performance thermoelectric materials such as bismuth telluride, lead telluride, etc. tend to contain very rare or toxic elements. Prof. Koumoto led the early development in achieving high thermoelectric performance in oxides and sulfides, through novel principles such as nanoblock integration, artificial superlattice structures, etc. His notable work on hybridization via organic molecules intercalation in layered sulfides achieved flexible high-performance thermoelectrics, which were targeted for wearable IoT power generation. For this Focus Issue, Prof. Koumoto and coworkers contributed an original paper on the recent development of a novel abundant sulfide thermoelectric material [9].
Effect of surface phonon scattering on thermal stress around small-scale elliptic holes in a thermoelectric material
Published in Journal of Thermal Stresses, 2021
Kun Song, Deshun Yin, Peter Schiavone
Thermoelectric materials distinguish themselves by the fact that they are capable of converting heat into electricity and vice versa making them extremely versatile, stable and efficient with the added advantage of releasing no emissions [1, 2]. In recent years, thermoelectric materials have been used widely in waste heat recovery, solar energy utilization and thermoelectric refrigeration; they also display great potential in the design and manufacture of aerospace, military and civil equipment [3]. It is now well-known that the energy conversion efficiency of thermoelectric materials can be significantly improved by introducing small (micro- or nano-) scale holes into the material (so-called “hole-doping”: see e.g., Hao et al. [4]). This, however, leads to thermal stress concentrations around the holes which can seriously threaten the reliability of the corresponding thermoelectric devices.