Improved Thermoelectric Properties of Re-Substituted Higher Manganese Silicides by Inducing Phonon Scattering and an Energy-Filtering Effect at Grain Boundary Interfaces

2019 ◽  
Vol 11 (34) ◽  
pp. 31169-31175 ◽  
Author(s):  
Swapnil Ghodke ◽  
Akio Yamamoto ◽  
Hsuan-Chun Hu ◽  
Shunsuke Nishino ◽  
Takuya Matsunaga ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Thermoelectric Properties ◽  
Phonon Scattering ◽  
Higher Manganese Silicides ◽  
Energy Filtering ◽  
Filtering Effect

Enhancement of Thermoelectric Properties of n-Type Bi2Te3–xSex by Energy Filtering Effect

2021 ◽  
Author(s):  
Yuhei Kawajiri ◽  
Sora-at Tanusilp ◽  
Masaya Kumagai ◽  
Manabu Ishimaru ◽  
Yuji Ohishi ◽  
...  
Keyword(s):  
Thermoelectric Properties ◽  
Energy Filtering ◽  
Filtering Effect

Core–shell nanostructures introduce multiple potential barriers to enhance energy filtering for the improvement of the thermoelectric properties of SnTe

Nanoscale ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 1904-1911 ◽  
Author(s):  
Zheng Ma ◽  
Chao Wang ◽  
Jingdan Lei ◽  
De Zhang ◽  
Yanqun Chen ◽  
...  
Keyword(s):  
Thermoelectric Properties ◽  
Core Shell ◽  
Potential Barriers ◽  
Energy Filtering ◽  
Shell Nanostructures ◽  
Filtering Effect

BiCuSeO@SnO2 core-shell nanostructures can introduce multiple potential barriers in SnTe to enhance energy filtering effect.

Improvements of Thermoelectric Performances in AgSbTe2 System With in-situ Ag2Te Nano-Precipitations

2010 ◽  
Vol 1267 ◽  
Author(s):  
Shengnan Zhang ◽  
Shenghui Yang ◽  
Guangyu Jiang ◽  
Junjie Shen ◽  
Tiejun Zhu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Thermoelectric Properties ◽  
Figure Of Merit ◽  
State Of The Art ◽  
Critical Component ◽  
Energy Filtering ◽  
Transmission Electron ◽  
Filtering Effect ◽  
The Relationship

AbstractAgSbTe2 is the critical component in both LAST-m and TAGS-x system, which are two state-of-the-art mid-temperature thermoelectric bulk nanocomposites. By adjusting the Ag2Te/Sb2Te3 ratio, Sb2Te3 and Ag2Te precipitated samples were obtained with x = 0.68 to 0.74 and x = 0.84 to 0.90 (x as in (Ag2Te)x/2(Sb2Te3)1-x/2), respectively. The single phased AgSbTe2 was obtained with the x value of 0.78 and 0.81, which is consistent of the previous results on the phase diagram of (Ag2Te)x(Sb2Te3)1-x system. Comparing the effect of the two different precipitates, Ag2Te are much effective for the improvements of thermoelectric properties in AgSbTe2 nanocomposites. Utilizing the high-resolution transmission electron microscopy, Ag2Te was observed as nanodots and nano-lamellae embedded in the AgSbTe2 matrix, which can be related to the energy filtering effect for the increase of Seebeck coefficient. The relationship among the composition, microstructure and thermoelectric properties was systematically studied. It can be noticed that the thermoelectric properties of AgSbTe2 system are very sensitive to the composition, especially at low temperature. The maximum figure of merit ZT value of 1.53 was obtained at 500 K for Ag0.84Sb1.16Te2.16 with 40% increase comparing with the single phased sample.

Influence of multi-sintering on the thermoelectric properties of Bi2Sr2Co2Oy ceramics

2019 ◽  
Vol 34 (02) ◽  
pp. 2050019 ◽  
Author(s):  
Y. Zhang ◽  
M. M. Fan ◽  
C. C. Ruan ◽  
Y. W. Zhang ◽  
X.-J. Li ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermoelectric Properties ◽  
Figure Of Merit ◽  
Phonon Scattering ◽  
Sintered Sample ◽  
Thermoelectric Figure Of Merit ◽  
Thermoelectric Figure ◽  
The Third ◽  
Ceramic Samples ◽  
Optimum Formula

[Formula: see text] ceramic samples have a structure similar to phonon glass electronic crystals, and their thermoelectric properties can be effectively adjusted through repeated grinding and sintering. The results show that multi-sintering can make their grain refined and increase their grain boundary, which will effectively increase density and phonon scattering. Finally, multi-sintering can reduce the resistivity and thermal conductivity, thus obviously improve thermoelectric figure of merit [Formula: see text] of [Formula: see text]. The optimum [Formula: see text] value of 0.26 is achieved at 923 K by the third sintered sample.

The phonon scattering mechanism and its effect on temperature dependent thermal and thermoelectric properties of the silver nanowire

2022 ◽  
Author(s):  
Gui-Cang He ◽  
Lina Shi ◽  
Yilei Hua ◽  
Xiao-Li Zhu
Keyword(s):  
Thermoelectric Properties ◽  
Phonon Scattering ◽  
Silver Nanowire ◽  
Scattering Mechanism ◽  
Temperature Dependent ◽  
Scattering Mechanisms ◽  
Phonon Structure

In this work, the electron-phonon, the phonon-phonon, and phonon structure scattering mechanisms and the effect on the thermal and thermoelectric properties of the silver nanowire (AgNW) are investigated in temperature...

scholarly journals Effect of ZnO and SnO2 Nanolayers at Grain Boundaries on Thermoelectric Properties of Polycrystalline Skutterudites

Nanomaterials ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2270
Author(s):  
Sang-il Kim ◽  
Jiwoo An ◽  
Woo-Jae Lee ◽  
Se Kwon ◽  
Woo Nam ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Atomic Layer Deposition ◽  
Grain Boundaries ◽  
Thermoelectric Properties ◽  
Phonon Scattering ◽  
Atomic Layer ◽  
Deposition Method ◽  
Plasma Sintering ◽  
Layer Deposition ◽  
Atomic Layer Deposition Method

Nanostructuring is considered one of the key approaches to achieve highly efficient thermoelectric alloys by reducing thermal conductivity. In this study, we investigated the effect of oxide (ZnO and SnO2) nanolayers at the grain boundaries of polycrystalline In0.2Yb0.1Co4Sb12 skutterudites on their electrical and thermal transport properties. Skutterudite powders with oxide nanolayers were prepared by atomic layer deposition method, and the number of deposition cycles was varied to control the coating thickness. The coated powders were consolidated by spark plasma sintering. With increasing number of deposition cycle, the electrical conductivity gradually decreased, while the Seebeck coefficient changed insignificantly; this indicates that the carrier mobility decreased due to the oxide nanolayers. In contrast, the lattice thermal conductivity increased with an increase in the number of deposition cycles, demonstrating the reduction in phonon scattering by grain boundaries owing to the oxide nanolayers. Thus, we could easily control the thermoelectric properties of skutterudite materials through adjusting the oxide nanolayer by atomic layer deposition method.

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