Enhancing the thermoelectric performance of nanosized CoSb<sub>3</sub>via short-range percolation of electrically conductive WTe<sub>2</sub> inclusions

Gharleghi, Ahmad; Liu, Yuanyuan; Zhou, Mi; He, Jian; Tritt, Terry M.; Liu, Chia‐Jyi

doi:10.1039/c6ta04011j

Cited by 38 publications

(20 citation statements)

References 44 publications

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“…The µ H of graphene/Cu 2 SnSe 3 composites increases with the increasing fraction of graphene. Moreover, the µ H of graphene/Cu 2 SnSe 3 samples in this study is between 20 and 35 cm 2 ·V −1 ·s −1 at room temperature, which is close with that of CoSb 3 [30,31]. This may be attributed to the similar carrier effective mass (m*) of Cu 2 SnSe 3 and skutterudite compounds.…”

Section: Electrical Propertiessupporting

confidence: 53%

Enhanced Thermoelectric Properties of Graphene/Cu2SnSe3 Composites

Zhao

Wang

2017

Crystals

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Cu 2 SnSe 3 material is regarded as a potential thermoelectric material due to its relatively high carrier mobility and low thermal conductivity. In this study, graphene was introduced into the Cu 2 SnSe 3 powder by ball milling, and the bulk graphene/Cu 2 SnSe 3 thermoelectric composites were prepared by spark plasma sintering. The graphene nanosheets distributed uniformly in the Cu 2 SnSe 3 matrix. Meanwhile, some graphene nanosheets tended to form thick aggregations, and the average length of these aggregations was about 3 µm. With the fraction of graphene increasing, the electrical conductivity of graphene/Cu 2 SnSe 3 samples increased greatly while the Seebeck coefficient was decreased. The introduction of graphene nanosheets can reduce the thermal conductivity effectively resulting from the phonon scattering by the graphene interface. When the content of graphene exceeds a certain value, the thermal conductivity of graphene/Cu 2 SnSe 3 composites starts to increase. The achieved highest figure of merit (ZT) for 0.25 vol % graphene/Cu 2 SnSe 3 composite was 0.44 at 700 K.

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Section: Electrical Propertiessupporting

confidence: 53%

Enhanced Thermoelectric Properties of Graphene/Cu2SnSe3 Composites

Zhao

Wang

2017

Crystals

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“…The higher packing density in 100-mesh films is induced by less pores and voids, less grain boundary scattering which leads to better electrical connection between the grains thereby, increasing the conductivity. 43 The highest value of electrical conductivity for the 100-mesh film is still significantly lower when compared to the bulk conductivity value. The highest electrical conductivity value for the 100-mesh chitosan-BTS TE composite films pressed at 200 MPa was 202 Scm À1 , whereas the electrical conductivity value of the bulk material was 700-800 Scm À1 .…”

Section: Effect Of Grain-size and Pressure On Electrical Conductivitymentioning

confidence: 96%

Thermoelectric Performance Enhancement of n-type Chitosan-Bi2Te2.7Se0.3 Composite Films Using Heterogeneous Grains and Mechanical Pressure

Banerjee

Jang

Huang

et al. 2021

J. Electron. Mater.

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A cost-effective and sustainable approach was used to enhance the thermoelectric performance of printable thermoelectric composite films. Using this approach, we are trying to get rid of the highly energy-intensive (high temperature and long duration) and time-consuming process of manufacturing thermoelectric generators. This study presents a unique approach of using an environmental-friendly and naturally occurring binder, a heterogeneous particle size distribution and applied mechanical pressure to fabricate n-type thermoelectric composite films. Recently spotlighted biomaterial, chitosan, was employed as a binder and it provided enough binding strength to the composite thermoelectric films. Bi 2 Te 2.7 Se 0.3 is an attractive n-type thermoelectric material because of its high thermoelectric performance. In this work, we are using two different (100-mesh and 325-mesh) n-type Bi 2 Te 2.7 Se 0.3 thermoelectric conductive particles for thermoelectric composite films to understand the role of wide-range particle distribution on thermoelectric composite films. In addition, two different weight ratios (1:2000 and 1:5000) of binders to Bi 2 Te 2.7 Se 0.3 particle and two different applied pressures (150 MPa and 200 MPa) were used for this study. The application of pressure and the use of a heterogenous particle distribution improves the packing density which leads to well-aggregated and coalesced polycrystal bulk-like structure in chitosan 100-mesh (heterogeneous particle distribution) Bi 2 Te 2.7 Se 0.3 thermoelectric composite films and hence improves the overall electrical conductivity and power factor. The best performing composite film was made with an ink of a 1:2000 weight ratio of binder to100-mesh Bi 2 Te 2.7 Se 0.3 and the applied pressure was 200 MPa. The electrical conductivity was 200 ± 7 S cm À1 , the Seebeck coefficient was À201 ± 6 lV K À1 , the power factor was 808 ± 69.7 lW m À1 K À2 , the thermal conductivity was 0.6 W m À1 K À1 , and the figure of merit was 0.4 at room temperature. Using energy efficient, sustainable, and cost effective method we achieved ZT of 0.40 for n-type thermoelectric composite films which is comparable to other printed n-type TE composite films. A 2-leg n-type Bi 2 Te 2.7 Se 0.3 device was fabricated with a power output of 0.48 lW at a closed circuit voltage of 2.1 mV and DT of 12 K.

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“…As a result, the power factor was markedly enhanced by up to 59 times that of the pristine CoSb 3 upon compositing. 17 Horta et al prepared polyaniline-poly(vinylacetate) (PANI-PVAc) organic nanocomposites via latex technology. 18 The relationship between the electrical properties (piezoresistive, thermoresistive and thermoelectric behaviour) and the PANI-PVAc ratio complied well with the percolation model related to morphological and structural changes.…”

Section: Scientific Mechanism Of Organic/ Inorganic Thermoelectric Comentioning

confidence: 99%

Recent advances, design guidelines, and prospects of flexible organic/inorganic thermoelectric composites

et al. 2020

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Enhancing the thermoelectric performance of nanosized CoSb₃via short-range percolation of electrically conductive WTe₂ inclusions

Abstract: N-type meso-composites of CoSb3–yWTe2 (micro-sized WTe2 + nano-sized unfilled CoSb3) were fabricated with zT = 0.78 at 575 K.

Cited by 38 publications

References 44 publications

Enhanced Thermoelectric Properties of Graphene/Cu2SnSe3 Composites

Enhanced Thermoelectric Properties of Graphene/Cu2SnSe3 Composites

Thermoelectric Performance Enhancement of n-type Chitosan-Bi2Te2.7Se0.3 Composite Films Using Heterogeneous Grains and Mechanical Pressure

Recent advances, design guidelines, and prospects of flexible organic/inorganic thermoelectric composites

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Enhancing the thermoelectric performance of nanosized CoSb3via short-range percolation of electrically conductive WTe2 inclusions

Abstract: N-type meso-composites of CoSb3–yWTe2 (micro-sized WTe2 + nano-sized unfilled CoSb3) were fabricated with zT = 0.78 at 575 K.

Cited by 38 publications

References 44 publications

Enhanced Thermoelectric Properties of Graphene/Cu2SnSe3 Composites

Enhanced Thermoelectric Properties of Graphene/Cu2SnSe3 Composites

Thermoelectric Performance Enhancement of n-type Chitosan-Bi2Te2.7Se0.3 Composite Films Using Heterogeneous Grains and Mechanical Pressure

Recent advances, design guidelines, and prospects of flexible organic/inorganic thermoelectric composites

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Enhancing the thermoelectric performance of nanosized CoSb₃via short-range percolation of electrically conductive WTe₂ inclusions