scholarly journals Optimum in the thermoelectric efficiency of nanostructured Nb-doped TiO2 ceramics: from polarons to Nb–Nb dimers

2020 ◽  
Vol 22 (23) ◽  
pp. 13008-13016 ◽  
Author(s):  
Alexandre Verchère ◽  
Stéphane Pailhès ◽  
Sylvie Le Floch ◽  
Sandrine Cottrino ◽  
Régis Debord ◽  
...  
Keyword(s):  
Thermoelectric Properties ◽  
Thermoelectric Efficiency ◽  
Doped Tio2

Thermoelectric properties of bulk nanostructured Nb-doped rutile TiO2.

scholarly journals Enhanced Thermoelectric Properties of WS2/Single-Walled Carbon Nanohorn Nanocomposites

Crystals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 140 ◽  
Author(s):  
Ji Hoon Kim ◽  
Seunggun Yu ◽  
Sang Won Lee ◽  
Seung-Yong Lee ◽  
Keun Soo Kim ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Seebeck Coefficient ◽  
Thermoelectric Properties ◽  
High Frequency ◽  
Figure Of Merit ◽  
Thermoelectric Efficiency ◽  
Thermoelectric Figure ◽  
Carbon Nanohorns ◽  
Single Walled Carbon ◽  
High Frequency Induction

Recently, two-dimensional tungsten disulfide (WS2) has attracted attention as a next generation thermoelectric material due to a favorable Seebeck coefficient. However, its thermoelectric efficiency still needs to be improved due to the intrinsically low electrical conductivity of WS2. In the present study, thermoelectric properties of WS2 hybridized with highly conductive single-walled carbon nanohorns (SWCNHs) were investigated. The WS2/SWCNH nanocomposites were fabricated by annealing the mixture of WS2 and SWCNHs using a high-frequency induction heated sintering (HFIHS) system. By adding SWCNHs to WS2, the nanocomposites exhibited increased electrical conductivity and a slightly decreased Seebeck coefficient with the content of SWCNHs. Hence, the maximum power factor of 128.41 μW/mK2 was achieved for WS2/SWCNHs with 0.1 wt.% SWCNHs at 780 K, resulting in a significantly improved thermoelectric figure of merit (zT) value of 0.027 compared to that of pristine WS2 with zT 0.017.

scholarly journals Optimization of thermoelectric efficiency in SnTe: the case for the light band

2014 ◽  
Vol 16 (38) ◽  
pp. 20741-20748 ◽  
Author(s):  
Min Zhou ◽  
Zachary M. Gibbs ◽  
Heng Wang ◽  
Yemao Han ◽  
Caini Xin ◽  
...  
Keyword(s):  
Valence Band ◽  
Thermoelectric Properties ◽  
Band Model ◽  
Thermoelectric Efficiency ◽  
Light Band

Enhanced thermoelectric properties of SnTe are obtained by counter-doping with iodine as predicted using a two-valence-band model.

scholarly journals Enhanced thermoelectric efficiency in ferromagnetic silicene nanoribbons terminated with hydrogen atoms

2014 ◽  
Vol 16 (25) ◽  
pp. 12900-12908 ◽  
Author(s):  
K. Zberecki ◽  
R. Swirkowicz ◽  
M. Wierzbicki ◽  
J. Barnaś
Keyword(s):  
Ab Initio ◽  
Thermoelectric Properties ◽  
Thermoelectric Efficiency ◽  
Hydrogen Atoms ◽  
Silicene Nanoribbons

Using ab initio methods we calculate thermoelectric and spin thermoelectric properties of silicene nanoribbons with bare, mono-hydrogenated and di-hydrogenated edges.

Enhancement of the thermoelectric properties of n-type PbTe by Na and Cl co-doping

2015 ◽  
Vol 3 (37) ◽  
pp. 9559-9564 ◽  
Author(s):  
I. Cohen ◽  
M. Kaller ◽  
G. Komisarchik ◽  
D. Fuks ◽  
Y. Gelbstein
Keyword(s):  
Thermoelectric Properties ◽  
Environmental Effects ◽  
Fossil Fuels ◽  
Thermoelectric Efficiency ◽  
Co Doping

In an attempt to reduce our reliance on fossil fuels, associated with severe environmental effects, the current research is focused on the enhancement of the direct thermal to electrical thermoelectric efficiency of n-type PbTe by Na and Cl co-doping.

scholarly journals Bottom-up assembly to Ag nanoparticles embedded Nb-doped TiO2 nanobulks with improved n-type thermoelectric properties

2012 ◽  
Vol 22 (28) ◽  
pp. 14180 ◽  
Author(s):  
Chengyan Liu ◽  
Lei Miao ◽  
Jianhua Zhou ◽  
Rong Huang ◽  
Sakae Tanemura
Keyword(s):  
Thermoelectric Properties ◽  
Ag Nanoparticles ◽  
Bottom Up ◽  
Doped Tio2

scholarly journals Oxidation-enhanced thermoelectric efficiency in a two-dimensional phosphorene oxide

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Seungjun Lee ◽  
Jeong-Pil Song ◽  
Seoung-Hun Kang ◽  
Young-Kyun Kwon
Keyword(s):  
Thermoelectric Properties ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Thermoelectric Performance ◽  
Boltzmann Transport ◽  
Thermoelectric Efficiency ◽  
Electron Phonon Interaction ◽  
Electron Relaxation Time ◽  
Low Dimensional ◽  
Spontaneous Oxidation

AbstractWe performed density functional theory calculations to investigate the thermoelectric properties of phosphorene oxide (PO) expected to form by spontaneous oxidation of phosphorene. Since thermoelectric features by nature arise from the consequences of the electron-phonon interaction, we computed the phonon-mediated electron relaxation time, which was fed into the semiclassical Boltzmann transport equation to be solved for various thermoelectric-related quantities. It was found that PO exhibits superior thermoelectric performance compared with its pristine counterpart, which has been proposed to be a candidate for the use of future thermoelectric applications. We revealed that spontaneous oxidation of phosphorene leads to a significant enhancement in the thermoelectric properties of n-doped phosphorene oxide, which is attributed to the considerable reduction of lattice thermal conductivity albeit a small decrease in electrical conductivity. Our results suggest that controlling oxidation may be utilized to improve thermoelectric performance in nanostructures, and PO can be a promising candidate for low-dimensional thermoelectric devices.

scholarly journals Thermoelectric properties of heavy fermion CeRhIn5 using density functional theory combined with semiclassical Boltzmann theory

RSC Advances ◽  
2019 ◽  
Vol 9 (62) ◽  
pp. 36182-36197 ◽  
Author(s):  
M. Yazdani-Kachoei ◽  
S. Jalali-Asadabadi
Keyword(s):  
Experimental Data ◽  
Density Functional Theory ◽  
Thermoelectric Properties ◽  
Low Temperatures ◽  
Heavy Fermion ◽  
Density Functional ◽  
Thermoelectric Cooling ◽  
Thermoelectric Efficiency ◽  
Functional Theory

Consistent with experimental data, theoretical thermoelectric results calculated by our developed strategy show that CeRhIn5 is a good candidate for thermoelectric cooling applications due to its high thermoelectric efficiency at low temperatures.

Thermoelectric properties of germanium telluride with fine-grained structure

2020 ◽  
Vol 11 ◽  
pp. 15-25
Author(s):  
L. D. Ivanova ◽  
◽  
Yu. V. Granatkina ◽  
I. Yu. Nikhezina ◽  
A. G. Malchev ◽  
...  
Keyword(s):  
Thermoelectric Properties ◽  
Melt Spinning ◽  
High Energy ◽  
Grain Structure ◽  
Thermoelectric Efficiency ◽  
Fine Grained ◽  
Germanium Telluride ◽  
Fine Grained Structure ◽  
Properties Of Materials ◽  
P Type

The microstructure and thermoelectric properties of materials based on germanium telluride p-type conductivity doped with copper and bismuth obtained by hot pressing of three types powders prepared by grinding an ingot to a size of hundreds microns (0.315  mm) to hundreds of nanometers (mechanical activation) in planetary high-energy mill and melt spinning were investigated. The microstructure of the samples were analyzed by optical and electron scanning microscopies. The nanoscale grain structure of these samples was established. The thermoelectric characteristics of the materials: Seebeck coefficient, electrical and thermal conductivities, were measured both at room temperature and in the temperature range of 100 – 800 K. The slopes of these dependencies are estimated. The coefficient of thermoelectric figure of merit is calculated. The higher thermoelectric efficiency (ZT = 1.5 at 600 K) was received for the samples hot-pressed from granules, prepared by melt spinning.

scholarly journals Fabrication of PEDOT: PSS-PVP Nanofiber-Embedded Sb2Te3 Thermoelectric Films by Multi-Step Coating and Their Improved Thermoelectric Properties

Materials ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 2835
Author(s):  
Sang-il Kim ◽  
Kang Yeol Lee ◽  
Jae-Hong Lim
Keyword(s):  
Thermoelectric Properties ◽  
Power Factor ◽  
Photoelectron Spectroscopy ◽  
Hybrid Composites ◽  
Composite Films ◽  
X Ray Diffraction ◽  
Thermoelectric Efficiency ◽  
X Ray ◽  
Seebeck Coefficients ◽  
Electrical Conductivities

Antimony telluride thin films display intrinsic thermoelectric properties at room temperature, although their Seebeck coefficients and electrical conductivities may be unsatisfactory. To address these issues, we designed composite films containing upper and lower Sb2Te3 layers encasing conductive poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS)- polyvinylpyrrolidone(PVP) nanowires. Thermoelectric Sb2Te3/PEDOT:PSS-PVP/Sb2Te3(ED) (STPPST) hybrid composite films were prepared by a multi-step coating process involving sputtering, electrospinning, and electrodeposition stages. The STPPST hybrid composites were characterized by field-emission scanning electron microscopy, X-ray diffraction, ultraviolet photoelectron spectroscopy, and infrared spectroscopy. The thermoelectric performance of the prepared STPPST hybrid composites, evaluated in terms of the power factor, electrical conductivity and Seebeck coefficient, demonstrated enhanced thermoelectric efficiency over a reference Sb2Te3 film. The performance of the composite Sb2Te3/PEDOT:PSS-PVP/Sb2Te3 film was greatly enhanced, with σ = 365 S/cm, S = 124 μV/K, and a power factor 563 μW/mK.

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