scholarly journals Low-Toxic, Earth-Abundant Nanostructured Materials for Thermoelectric Applications

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 895
Author(s):  
Farheen F. Jaldurgam ◽  
Zubair Ahmad ◽  
Farid Touati
Keyword(s):  
Nanostructured Materials ◽  
High Performance ◽  
Figure Of Merit ◽  
Cost Effective ◽  
Critical Aspect ◽  
Research Directions ◽  
Earth Abundant ◽  
Recent Developments ◽  
Low Toxic ◽  
Future Direction

This article presents recent research directions in the study of Earth-abundant, cost-effective, and low-toxic advanced nanostructured materials for thermoelectric generator (TEG) applications. This study’s critical aspect is to systematically evaluate the development of high-performance nanostructured thermoelectric (TE) materials from sustainable sources, which are expected to have a meaningful and enduring impact in developing a cost-effective TE system. We review both the performance and limitation aspects of these materials at multiple temperatures from experimental and theoretical viewpoints. Recent developments in these materials towards enhancing the dimensionless figure of merit, Seebeck coefficient, reduction of the thermal conductivity, and improvement of electrical conductivity have also been discussed in detail. Finally, the future direction and the prospects of these nanostructured materials have been proposed.

scholarly journals Polycrystalline SnSe with a thermoelectric figure of merit greater than the single crystal

2021 ◽  
Author(s):  
Chongjian Zhou ◽  
Yong Kyu Lee ◽  
Yuan Yu ◽  
Sejin Byun ◽  
Zhong-Zhen Luo ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Single Crystal ◽  
High Performance ◽  
Figure Of Merit ◽  
Waste Heat ◽  
Electric Energy ◽  
Cost Effective ◽  
Tin Selenide ◽  
Tin Oxides ◽  
Thermally Conductive

AbstractThermoelectric materials generate electric energy from waste heat, with conversion efficiency governed by the dimensionless figure of merit, ZT. Single-crystal tin selenide (SnSe) was discovered to exhibit a high ZT of roughly 2.2–2.6 at 913 K, but more practical and deployable polycrystal versions of the same compound suffer from much poorer overall ZT, thereby thwarting prospects for cost-effective lead-free thermoelectrics. The poor polycrystal bulk performance is attributed to traces of tin oxides covering the surface of SnSe powders, which increases thermal conductivity, reduces electrical conductivity and thereby reduces ZT. Here, we report that hole-doped SnSe polycrystalline samples with reagents carefully purified and tin oxides removed exhibit an ZT of roughly 3.1 at 783 K. Its lattice thermal conductivity is ultralow at roughly 0.07 W m–1 K–1 at 783 K, lower than the single crystals. The path to ultrahigh thermoelectric performance in polycrystalline samples is the proper removal of the deleterious thermally conductive oxides from the surface of SnSe grains. These results could open an era of high-performance practical thermoelectrics from this high-performance material.

High thermoelectric performance in low-cost SnS0.91Se0.09 crystals

Science ◽  
2019 ◽  
Vol 365 (6460) ◽  
pp. 1418-1424 ◽  
Author(s):  
Wenke He ◽  
Dongyang Wang ◽  
Haijun Wu ◽  
Yu Xiao ◽  
Yang Zhang ◽  
...  
Keyword(s):  
Thermoelectric Materials ◽  
High Performance ◽  
Carrier Mobility ◽  
Figure Of Merit ◽  
Toxic Elements ◽  
Low Cost ◽  
Thermoelectric Performance ◽  
Tin Sulfide ◽  
Temperature Dependent ◽  
Earth Abundant

Thermoelectric technology allows conversion between heat and electricity. Many good thermoelectric materials contain rare or toxic elements, so developing low-cost and high-performance thermoelectric materials is warranted. Here, we report the temperature-dependent interplay of three separate electronic bands in hole-doped tin sulfide (SnS) crystals. This behavior leads to synergistic optimization between effective mass (m*) and carrier mobility (μ) and can be boosted through introducing selenium (Se). This enhanced the power factor from ~30 to ~53 microwatts per centimeter per square kelvin (μW cm−1 K−2 at 300 K), while lowering the thermal conductivity after Se alloying. As a result, we obtained a maximum figure of merit ZT (ZTmax) of ~1.6 at 873 K and an average ZT (ZTave) of ~1.25 at 300 to 873 K in SnS0.91Se0.09 crystals. Our strategy for band manipulation offers a different route for optimizing thermoelectric performance. The high-performance SnS crystals represent an important step toward low-cost, Earth-abundant, and environmentally friendly thermoelectrics.

High Performance Thermoelectrics from Earth-Abundant Materials: Enhanced Figure of Merit in PbS by Second Phase Nanostructures

2011 ◽  
Vol 133 (50) ◽  
pp. 20476-20487 ◽  
Author(s):  
Li-Dong Zhao ◽  
Shih-Han Lo ◽  
Jiaqing He ◽  
Hao Li ◽  
Kanishka Biswas ◽  
...  
Keyword(s):  
High Performance ◽  
Figure Of Merit ◽  
Second Phase ◽  
Earth Abundant

Nanostructured materials on 3D nickel foam as electrocatalysts for water splitting

Nanoscale ◽  
2017 ◽  
Vol 9 (34) ◽  
pp. 12231-12247 ◽  
Author(s):  
Nitin K. Chaudhari ◽  
Haneul Jin ◽  
Byeongyoon Kim ◽  
Kwangyeol Lee
Keyword(s):  
Water Splitting ◽  
Nanostructured Materials ◽  
Nickel Foam ◽  
Water Electrolysis ◽  
Earth Abundant ◽  
Recent Developments

This review addresses recent developments in earth-abundant electrocatalysts directly synthesized on 3D nickel foam as electrodes for electrochemical water electrolysis.

Corrosion inhibitors for metals in maintenance equipment: introduction and recent developments

2014 ◽  
Vol 32 (5-6) ◽  
pp. 163-181 ◽  
Author(s):  
Yongxin Li ◽  
Yaoyao Zhang ◽  
Scott Jungwirth ◽  
Nicholas Seely ◽  
Yida Fang ◽  
...  
Keyword(s):  
Ambient Temperature ◽  
High Performance ◽  
Corrosion Inhibitors ◽  
Cost Effective ◽  
The State ◽  
Neutral Ph ◽  
Recent Developments ◽  
Temperature And Pressure ◽  
Metallic Corrosion ◽  
Transportation Agencies

AbstractCorrosion inhibitors are extensively applied to prevent the corrosion of metals in maintenance and vehicles used by transportation agencies. The aim of this review is to examine the state of the corrosion inhibitors for the protection of various metals/alloys commonly used in maintenance equipment and vehicles and to identify cost-effective, high-performance corrosion inhibitors that may contribute to the preservation of equipment assets. The focus is placed on the metallic corrosion induced or aggravated by chlorides at ambient temperature and pressure and near-neutral pH (6–8).

High performance thermoelectrics from earth-abundant materials: Enhanced figure of merit in PbS through nanostructuring grain size

2016 ◽  
Vol 664 ◽  
pp. 411-416 ◽  
Author(s):  
Cheng Chang ◽  
Yu Xiao ◽  
Xiao Zhang ◽  
Yanling Pei ◽  
Fu Li ◽  
...  
Keyword(s):  
Grain Size ◽  
High Performance ◽  
Figure Of Merit ◽  
Earth Abundant

scholarly journals Bipolar doping and thermoelectric properties of Zintl arsenide Eu5In2As6

2021 ◽  
Author(s):  
Naoki Tomitaka ◽  
Yosuke Goto ◽  
Kota Morino ◽  
Kazuhisa Hoshi ◽  
Yuki Nakahira ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Electrical Resistivity ◽  
Thermoelectric Properties ◽  
High Performance ◽  
Figure Of Merit ◽  
Lattice Thermal Conductivity ◽  
High Resistivity ◽  
Dimensionless Figure Of Merit ◽  
Recent Developments ◽  
P Type

Zintl compounds exhibit promising thermoelectric properties because of the feasibility of the chemical tuning of their electrical and thermal transport. While most Zintl pnictides are known to show p-type polarity, recent developments in high-performance n-type Mg3Sb2-based thermoelectric materials have encouraged further identification of n-type Zintl pnictides. In this study, we demonstrate the bipolar dopability of the Zintl arsenide Eu5In2As6. The electrical resistivity at 300 K with n-type polarity was decreased to 7.6 x 10^-1 ohmcm using La as an electron dopant. In contrast to the relatively high resistivity of n-type Eu5In2As6, the p-type resistivity at 300 K was decreased to 5.9 x 10^-3 ohmcm with a carrier concentration of 2.8 x 10^20 /cm3 using Zn as a hole dopant. This doping asymmetry is discussed in terms of the weighted mobility of electrons and holes. Furthermore, a very low lattice thermal conductivity of 0.7 W/mK was observed at 773 K, which is comparable to that of the Sb-containing analogue Eu5In2Sb6. The dimensionless figure of merit ZT = 0.29 at 773 K for Zn-doped p-type Eu5In2As6. This study shows that bipolar dopable Eu5In2As6 can be a platform to facilitate a better understanding of the doping asymmetry in Zintl pnictides.

Out-of-Autoclave (OOA) Manufacturing Technologies for Composite Sandwich Structures

2017 ◽  
pp. 292-317
Author(s):  
Laraib Alam Khan ◽  
Wajid Ali Khan ◽  
S. Ahmed
Keyword(s):  
High Performance ◽  
Sandwich Structures ◽  
Cost Effective ◽  
Filament Winding ◽  
Composite Sandwich ◽  
Recent Developments ◽  
Belt Press ◽  
Out Of Autoclave ◽  
Manufacturing Technologies ◽  
Processing Techniques

This chapter gives an overview of cost effective processing techniques, employed for manufacturing of sandwich structures, primarily for high performance applications. The scope of this chapter is to review the processes which may produce the autoclave cured quality parts, without the use of autoclave. The chapter starts with an overview of autoclave processing, highlighting the different features, which depicts the capacity of technique to produce highly repeatable parts. Studies related to manufacturing of sandwich structures in autoclave, with and without adhesive film, are reviewed and discussed. Process briefs and recent developments of different out of autoclave (OOA) techniques for manufacturing of sandwich structures are then discussed which includes, OOA prepregs systems, Quickstep processing, Vacuum Infusion Process, compression molding, double belt press and filament winding. A brief overview of manufacturing processes for thermoplastic based sandwich structures is also provided at the end.

scholarly journals Physical Intuition to Improve Electronic Properties of Thermoelectrics

2021 ◽  
Vol 9 ◽  
Author(s):  
Wei Yang Samuel Lim ◽  
Danwei Zhang ◽  
Solco Samantha Faye Duran ◽  
Xian Yi Tan ◽  
Chee Kiang Ivan Tan ◽  
...  
Keyword(s):  
High Performance ◽  
Carrier Mobility ◽  
Figure Of Merit ◽  
Lattice Thermal Conductivity ◽  
Charge Carrier Concentration ◽  
Advanced Materials ◽  
Commercial Application ◽  
Large Fluctuation ◽  
Theoretical Estimation ◽  
Earth Abundant

Thermoelectrics convert heat to electricity and vice versa. They are of technological importance in cooling and energy harvesting. Their performances are defined by figure of merit, zT. Decades of studies have largely focused on the development of novel and advanced materials reaching higher performance in devices. To date, the lack of sufficiently high-performance thermoelectrics, especially among Earth-abundant and lightweight materials, is one of the reasons why there is no broad commercial application of thermoelectric devices yet. This challenge is due to the complex correlations of parameters that make up the zT. Theoretical estimation can reveal the optimal charge carrier concentration, which can provide a good idea of doping compositions. Depending on the material characteristics, decoupling these intercorrelated parameters could be viable. Broadly speaking, increasing carrier mobility, inducing a large fluctuation in density of states (DOS) at the Fermi level, and lowering the lattice thermal conductivity lead to better thermoelectric performance. In this mini review, we provide a broad picture of electronic property optimization for thermoelectric materials. This work will be a useful guide to quickly take readers to the forefront of thermoelectric research.

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