scholarly journals Understanding the asymmetrical thermoelectric performance for discovering promising thermoelectric materials

2019 ◽  
Vol 5 (6) ◽  
pp. eaav5813 ◽  
Author(s):  
Hangtian Zhu ◽  
Jun Mao ◽  
Zhenzhen Feng ◽  
Jifeng Sun ◽  
Qing Zhu ◽  
...  
Keyword(s):  
Power Generation ◽  
High Temperature ◽  
Thermoelectric Power ◽  
Conversion Efficiency ◽  
Thermoelectric Materials ◽  
The Other ◽  
Thermoelectric Performance ◽  
Cold Side ◽  
P Type ◽  
The Relationship

Thermoelectric modules, consisting of multiple pairs of n- and p-type legs, enable converting heat into electricity and vice versa. However, the thermoelectric performance is often asymmetrical, in that one type outperforms the other. In this paper, we identified the relationship between the asymmetrical thermoelectric performance and the weighted mobility ratio, a correlation that can help predict the thermoelectric performance of unreported materials. Here, a reasonably high ZT for the n-type ZrCoBi-based half-Heuslers is first predicted and then experimentally verified. A high peak ZT of ~1 at 973 K can be realized by ZrCo0.9Ni0.1Bi0.85Sb0.15. The measured heat-to-electricity conversion efficiency for the unicouple of ZrCoBi-based materials can be as high as ~10% at the cold-side temperature of ~303 K and at the hot-side temperature of ~983 K. Our work demonstrates that the ZrCoBi-based half-Heuslers are highly promising for the application of mid- and high-temperature thermoelectric power generation.

Metal-like electrical conductivity in LaxSr2−xTiMoO6 oxides for high temperature thermoelectric power generation

2017 ◽  
Vol 46 (18) ◽  
pp. 5872-5879 ◽  
Author(s):  
Mandvi Saxena ◽  
Tanmoy Maiti
Keyword(s):  
Power Generation ◽  
Electrical Conductivity ◽  
High Temperature ◽  
Energy Conversion ◽  
Thermoelectric Power ◽  
Conversion Efficiency ◽  
Energy Conversion Efficiency ◽  
Power Generators ◽  
Thermoelectric Power Generation

Increasing electrical conductivity in oxides, which are inherently insulators, can be a potential route in developing oxide-based thermoelectric power generators with higher energy conversion efficiency.

scholarly journals Computational prediction of the thermoelectric performance of LaZnOPn (Pn = P, As)

2020 ◽  
Vol 8 (16) ◽  
pp. 7914-7924 ◽  
Author(s):  
Maud Einhorn ◽  
Benjamin A. D. Williamson ◽  
David O. Scanlon
Keyword(s):  
Density Functional Theory ◽  
High Temperature ◽  
Thermoelectric Materials ◽  
Density Functional ◽  
State Of The Art ◽  
Computational Prediction ◽  
Thermoelectric Performance ◽  
Functional Theory ◽  
Earth Abundant ◽  
P Type

State-of-the-art density functional theory is used to demonstrate that LaZnOP and LaZnOAs have great potential as earth-abundant p-type thermoelectric materials for high-temperature applications.

High Temperature Transport Probe for Thermopower and Resistmty Measurements

1998 ◽  
Vol 545 ◽  
Author(s):  
R. T. Littleton ◽  
Jason Jeffries ◽  
Michael A. Kaeser ◽  
Michael Long ◽  
Terry M. Tritt
Keyword(s):  
Power Generation ◽  
High Temperature ◽  
Thermoelectric Power ◽  
Temperature Difference ◽  
Thermoelectric Materials ◽  
Elevated Temperatures ◽  
Absolute Temperature ◽  
Probe Design ◽  
The Absolute

AbstractWe have recently developed a device to measure resistivity and Seebeck values of a material as a function of temperature over a range of 80K < T < 700K. These measurements overlap in temperature with our existing apparatus (4K < T < 320K). These measurements are necessary for the investigation of potential thermoelectric materials at elevated temperatures, where power generation applications are important. The probe design allows for various types of samples to be evaluated from needle like samples ( L ≈ 2mm, D ≈ 50μm ) to larger pressed pellet samples ( ≈ 2mm × 2mm × 10mm). Separate high temperature cartridge heaters are used to stabilize both the absolute temperature, T, as well as the temperature difference, ΔT. Thermocouples measuring T+ΔT/2 and T-ΔT/2 are also employed to measure sample voltages for resistance and thermoelectric power. Design details and measurement specifics will be discussed. Data taken on standards a well as some research samples will be presented.

High efficiency GeTe-based materials and modules for thermoelectric power generation

2021 ◽  
Author(s):  
Tong Xing ◽  
Qingfeng Song ◽  
Pengfei Qiu ◽  
Qihao Zhang ◽  
Ming Gu ◽  
...  
Keyword(s):  
Power Generation ◽  
Thermoelectric Power ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
High Efficiency ◽  
Waste Heat ◽  
Thermoelectric Performance ◽  
Thermoelectric Generators ◽  
Thermoelectric Power Generation

GeTe-based materials have a great potential to be used in thermoelectric generators for waste heat recovery due to their excellent thermoelectric performance, but their module research is greatly lagging behind...

Realizing high-efficiency power generation in low-cost PbS-based thermoelectric materials

2020 ◽  
Vol 13 (2) ◽  
pp. 579-591 ◽  
Author(s):  
Binbin Jiang ◽  
Xixi Liu ◽  
Qi Wang ◽  
Juan Cui ◽  
Baohai Jia ◽  
...  
Keyword(s):  
Power Generation ◽  
Conversion Efficiency ◽  
Thermoelectric Materials ◽  
High Efficiency ◽  
Low Cost ◽  
Thermoelectric Module ◽  
High Conversion ◽  
High Conversion Efficiency

A high conversion efficiency of 11.2% was realized in a low-cost PbS-based segmented thermoelectric module.

High-Temperature PbTe Thin Films for Use in Cascade Thermoelectric Power Generation

2003 ◽  
Vol 793 ◽  
Author(s):  
J.B. Posthill ◽  
J.C. Caylor ◽  
P.D. Crocco ◽  
T.S. Colpitts ◽  
R. Venkatasubramanian
Keyword(s):  
Thin Films ◽  
Thermal Conductivity ◽  
Power Generation ◽  
High Temperature ◽  
Ambient Temperature ◽  
Thermoelectric Power ◽  
Thermal Evaporation ◽  
Potential Candidate ◽  
Substrate Orientation ◽  
Subtle Effect

ABSTRACTPbTe-based thin films were deposited by thermal evaporation at temperatures ranging from ambient temperature to 430°C on different vicinal GaAs (100) substrates and BaF2 (111). This materials system is being evaluated as a potential candidate thermoelectric material for a mid-temperature stage in a cascade power generation module. Pure PbTe, PbSe, and multilayer PbTe/PbSe films were investigated. All films deposited on different vicinal GaAs (100) substrates were found to be polycrystalline when deposited at 250°C or lower. A subtle effect of substrate orientation and multilayer periodicity appears to contribute to the more randomly oriented polycrystallinity, which also lowers the thermal conductivity. These results are compared with PbTe epitaxial results on BaF2 (111).

Power generation performance of π-structure thermoelectric device using NaCo2O4 and Mg2Si elements

2013 ◽  
Vol 1490 ◽  
pp. 185-190 ◽  
Author(s):  
Tomoyuki Nakamura ◽  
Kazuya Hatakeyama ◽  
Masahiro Minowa ◽  
Youhiko Mito ◽  
Koya Arai ◽  
...  
Keyword(s):  
Power Generation ◽  
Thermoelectric Power ◽  
Thermoelectric Properties ◽  
Waste Heat ◽  
Maximum Output Power ◽  
Magnesium Silicide ◽  
Thermoelectric Device ◽  
Maximum Output ◽  
Thermoelectric Power Generation ◽  
P Type

ABSTRACTThermoelectric power generation has been attracting attention as a technology for waste heat utilization in which thermal energy is directly converted into electric energy. It is well known that layered cobalt oxide compounds such as NaCo2O4 and Ca3Co4O9 have high thermoelectric properties in p-type oxide semiconductors. However, in most cases, the thermoelectric properties in n-type oxide materials are not as high. Therefore, n-type magnesium silicide (Mg2Si) has been studied as an alternative due to its non-toxicity, environmental friendliness, lightweight property, and comparative abundance compared with other TE systems. In this study, we fabricated π-structure thermoelectric power generation devices using p-type NaCo2O4 elements and n-type Mg2Si elements. The p- and n-type sintering bodies were fabricated by spark plasma sintering (SPS). To reduce the resistance at the interface between elements and electrodes, we processed the surface of the elements before fabricating the devices. The end face of a Mg2Si element was covered with Ni by SPS and that of a NaCo2O4 element was coated with Ag by silver paste and soldering.The thermoelectric device consisted of 18 pairs of p-type and n-type legs connected with Ag electrodes. The cross-sectional and thickness dimensions of the p-type elements were 3.0 mm × 5.0 mm × 7.6 mm (t) and those of the n-type elements were 3.0 mm × 3.0 mm × 7.6 mm (t). The open circuit voltage was 1.9 V and the maximum output power was 1.4 W at a heat source temperature of 873 K and a cooling water temperature of 283 K in air.

Achieving high-performance p-type SmMg2Bi2 thermoelectric materials through band engineering and alloying effects

2020 ◽  
Vol 8 (31) ◽  
pp. 15760-15766 ◽  
Author(s):  
Udara Saparamadu ◽  
Xiaojian Tan ◽  
Jifeng Sun ◽  
Zhensong Ren ◽  
Shaowei Song ◽  
...  
Keyword(s):  
Power Generation ◽  
Thermoelectric Materials ◽  
High Performance ◽  
Promising Material ◽  
Band Engineering ◽  
P Type ◽  
Alloying Effects

P-type SmMg2Bi2, a new member of Bi-based 1-2-2 Zintl family, has been investigated and demonstrated to be a promising material for application in TE power generation.

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