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Energies
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Thermoelectric Materials for Energy Conversion
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Thermoelectric Materials for Energy Conversion

A special issue of Energies (ISSN 1996-1073).

Deadline for manuscript submissions: closed (31 January 2018) | Viewed by 14359

Special Issue Editor

Prof. Dr. Zhi-Gang Chen

grade E-Mail Website
Guest Editor
Faculty of Engineering, School of Mechanical and Mining Engineering, The University of Queensland, St Lucia, QLD 4072, Australia
Interests: smart functional nanomaterials for thermoelectrics and nanoelectronics from synthesizing materials to understanding their underlying physics and chemistry

Special Issue Information

Dear Colleagues,

Thermoelectrics can enable direct energy conversion between heat and electricity, based on thermoelectric effects, which has been considered as a green and sustainable solution to the global energy dilemma. Energy conversion efficiency of thermoelectrics is weighed by the dimensionless figure of merit, ZT = S2σT/κ, where S, σ, κ and T are, respectively, the Seebeck coefficient, electrical conductivity, thermal conductivity (including electronic component κe and lattice component κl), and the working temperature. Thus far, significant progress has been achieved in enhancing ZT via increasing powder factor (S2σ) (by band convergence, reversible phase transition, quantum confinement) and/or reducing κ (by nanostructuring, hierarchical architecturing, matrix with nano-precipitate). This Special Issue will focuses on recent advances in thermoelectric sector on a wide range of topics from material design to applications in energy conversions, including:

  • Thermoelectric materials
  • Thermoelectric refrigeration
  • Thermoelectric power generation
  • Thermoelectric water generation
  • New type thermoelectric

Dr. Zhi-Gang Chen
Guest Editor

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Keywords

  • Thermoelectric Materials
  • Device
  • Power Generation
  • Cooling

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Published Papers (3 papers)

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Research

5101 KiB  
Article
Enhanced Thermoelectric Properties of Cu3SbSe4 Compounds via Gallium Doping
by Degang Zhao, Di Wu and Lin Bo
Energies 2017, 10(10), 1524; https://doi.org/10.3390/en10101524 - 6 Oct 2017
Cited by 39 | Viewed by 4266
Abstract
In this study, the p-type Ga-doped Cu3Sb1−xGaxSe4 compounds were fabricated by melting, annealing, grinding, and spark plasma sintering (SPS). The transport properties of Ga-doped Cu3Sb1−xGaxSe4 compounds [...] Read more.
In this study, the p-type Ga-doped Cu3Sb1−xGaxSe4 compounds were fabricated by melting, annealing, grinding, and spark plasma sintering (SPS). The transport properties of Ga-doped Cu3Sb1−xGaxSe4 compounds were investigated. As Ga content increased, the hole concentration of Cu3Sb1−xGaxSe4 compounds increased, which led to an increase in electrical conductivity. Meanwhile, the Seebeck coefficient of the Cu3Sb1−xGaxSe4 compounds decreased as Ga content increased. The extra phonon scattering originating from Ga-doping effectively depressed the lattice thermal conductivity of the Cu3Sb1−xGaxSe4 compounds. The ZT value of Cu3SbSe4 markedly improved, which is primarily ascribed to the depressed lattice thermal conductivity and the increased electrical conductivity. The highest ZT value for the Cu3Sb0.985Ga0.015Se4 compound was 0.54 at 650 K, which is two times higher than that of a pure Cu3SbSe4 compound. Full article
(This article belongs to the Special Issue Thermoelectric Materials for Energy Conversion)
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1705 KiB  
Article
Transverse Thermoelectricity in Fibrous Composite Materials
by Bosen Qian and Fei Ren
Energies 2017, 10(7), 1006; https://doi.org/10.3390/en10071006 - 16 Jul 2017
Cited by 6 | Viewed by 4304
Abstract
Transverse thermoelectric elements have the potential to decouple the electric current and the heat flow, which could lead to new designs of thermoelectric devices. While many theoretical and experimental studies of transverse thermoelectricity have focused on layered structures, this work examines composite materials [...] Read more.
Transverse thermoelectric elements have the potential to decouple the electric current and the heat flow, which could lead to new designs of thermoelectric devices. While many theoretical and experimental studies of transverse thermoelectricity have focused on layered structures, this work examines composite materials with aligned fibrous inclusions. A simplified mathematical model was derived based on the Kirchhoff Circuit Laws (KCL), which were used to calculate the equivalent transport properties of the composite structures. These equivalent properties, including Seebeck coefficient, electrical conductivity, and thermal conductivity, compared well with finite element analysis (FEA) results. Peltier cooling performance was also examined using FEA, which exhibited good agreement to KCL model predictions. In addition, a survey was conducted on selected combinations of thermoelectric materials and metals to rank their transverse thermoelectricity with respect to the dimensionless figure of merit. Full article
(This article belongs to the Special Issue Thermoelectric Materials for Energy Conversion)
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3301 KiB  
Article
Enhanced Thermoelectric Properties of Cu3SbSe3-Based Composites with Inclusion Phases
by Rui Liu, Guangkun Ren, Xing Tan, Yuanhua Lin and Cewen Nan
Energies 2016, 9(10), 816; https://doi.org/10.3390/en9100816 - 14 Oct 2016
Cited by 10 | Viewed by 4799
Abstract
Cu3SbSe3-based composites have been prepared by self-propagating high-temperature synthesis (SHS) combined with spark plasma sintering (SPS) technology. Phase composition and microstructure analysis indicate that the obtained samples are mainly composed of Cu3SbSe3 phase and CuSbSe2 [...] Read more.
Cu3SbSe3-based composites have been prepared by self-propagating high-temperature synthesis (SHS) combined with spark plasma sintering (SPS) technology. Phase composition and microstructure analysis indicate that the obtained samples are mainly composed of Cu3SbSe3 phase and CuSbSe2/Cu2−xSe secondary phases. Our results show that the existence of Cu2−xSe phase can clearly enhance the electrical conductivity of the composites (~16 S/cm), which is 2.5 times higher than the pure phase. The thermal conductivity can remain at about 0.30 W·m−1·K−1 at 653 K. A maximum ZT (defined as ZT = S2σΤ/κ, where S, σ, Τ, κ are the Seebeck coefficient, electrical conductivity, absolute temperature and total thermal conductivity) of the sample SPS 633 can be 0.42 at 653 K, which is 60% higher than the previously reported values. Our results indicate that the composite structure is an effective method to enhance the performance of Cu3SbSe3. Full article
(This article belongs to the Special Issue Thermoelectric Materials for Energy Conversion)
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