Enhanced thermoelectric properties of n-type Bi2Te2.7Se0.3 materials by TiO2 ceramic nanoparticle dispersion-induced energy filtering effect

Hu, Qiujun; Guo, Junbiao; Zuo, Hanyang; Chen, Haowen

doi:10.1016/j.ceramint.2023.07.183

Cited by 9 publications

(1 citation statement)

References 41 publications

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“…Figure c,d shows a comparison of ZT and ZT ave for n-type BTS of this work and other literature. Obviously, the obtained highest ZT and ZT ave for this work are comparative than relevant value reported in typical n-type BTS systems. ,− The results indicate that incorporation of Si 3 N 4 can effectively improve the ZT and ZT ave for BTS.…”

Section: Resultsmentioning

confidence: 44%

Enhancing Thermoelectric Performance of n-Type Bi₂Te_2.7Se_0.3 through Incorporation of Amorphous Si₃N₄ Nanoparticles

Chen,

Li,

Chen

et al. 2024

ACS Appl. Mater. Interfaces

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Bi 2 Te 3 -based thermoelectric (TE) materials are the state-of-the-art compounds for commercial applications near room temperature. Nevertheless, the application of the n-type Bi 2 Te 2.7 Se 0.3 (BTS) is restricted by the comparatively low figure of merit (ZT) and intrinsic embrittlement. Here, we show that through dispersion of amorphous Si 3 N 4 (a-Si 3 N 4 ) nanoparticles both 14% increase in power factor (at 300 K) and 48% decrease in lattice thermal conductivity are simultaneously realized. The increased power factor comes from enhanced thermopower and reduced electrical resistivity while the reduced lattice thermal conductivity originates mainly from scattering of middle-and low-frequency phonons at the incorporated a-Si 3 N 4 nanoparticles. As a result, a large ZT max = 1.19 (at 373 K) and an average ZT ave ∼ 1.12 (300−473 K) with better mechanical properties are achieved for the BTS/0.25 wt % Si 3 N 4 sample. Present results demonstrate that the incorporation of a-Si 3 N 4 is a promising way to improve TE performance.

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Section: Resultsmentioning

confidence: 44%

Enhancing Thermoelectric Performance of n-Type Bi₂Te_2.7Se_0.3 through Incorporation of Amorphous Si₃N₄ Nanoparticles

Chen,

Li,

Chen

et al. 2024

ACS Appl. Mater. Interfaces

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Nanocomposite Strategy toward Enhanced Thermoelectric Performance in Bismuth Telluride

Zhuang,

Yu,

2024

Small Science

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Bismuth telluride‐based thermoelectric (TE) materials have been commercially applied in near‐room temperature refrigeration. However, enhancing their TE performance remains crucial for expanding their application fields. Nanocomposite strategy has been widely reported as an effective approach to improving the TE performance of bismuth telluride‐based materials. In this review, the nanoinclusions are categorized into different groups, including nonmetallic hard nanoparticles, metallic nanoparticles, compounds with low thermal conductivity, and low‐dimensional materials. A comprehensive overview of relevant researches and present typical cases and recent advancements is provided. It is worth noting that nonmetallic hard nanoparticles are most widely used for reinforcing bismuth telluride‐based materials; the noticeable enhancement can be attributed to the interfaces that induce phonon scattering to reduce lattice thermal conductivity as well as multiple scattering effects along with energy filtering to increase the Seebeck coefficient. Although there exist challenges in terms of interface characterization and dispersion improvement for nanoinclusions, it is undeniable that the nanocomposite strategy offers a viable pathway to enhance the TE performance of bismuth telluride‐based materials. Therefore, further exploration in this direction is warranted to promote the development and application of TE technology at near‐room temperature.

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Grain Manipulation by Annealing Treatment Realizes High‐Performance N‐Type Bi₂Te_2.4Se_0.6 Thermoelectric Material and Device

Chen,

Guo,

et al. 2024

Small Methods

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Bi2Te3‐based materials play a crucial role in solid cooling and power generation, but the rapidly deteriorated ZT with rising temperatures above 450 K severely limits further applications. Here, this paper reports a novel preparation method of annealing treatment for molten ingot, which can enhance the thermoelectric performance of n‐type Bi2Te2.4Se0.6 in a wide temperature range. Instead of conventional halides, copper is adopted to regulate the carrier concentration and grain size to optimal levels. During the process of annealing at 573 K for 4 h, the number of twins significantly increases and the grains of Cu‐doped samples become larger and more oriented. These optimizations lead to higher carrier mobility with similar carrier concentration compared with the sample without heat treatment. The synergistic effects of Cu doping and annealing treatment realize a high average ZT of 0.89 within 300–600 K in n‐type Cu0.02Bi2Te2.4Se0.6. Combined with p‐type (Bi,Sb)2Te3, the fabricated thermoelectric device exhibits a high conversion efficiency of 6.9% at a temperature difference of 300 K. This study suggests that annealing treatment is a simple and effective scheme to promote the applications of n‐type Bi2(Te,Se)3 in a wide temperature range.

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Enhanced thermoelectric properties of n-type Bi2Te2.7Se0.3 materials by TiO2 ceramic nanoparticle dispersion-induced energy filtering effect

Cited by 9 publications

References 41 publications

Enhancing Thermoelectric Performance of n-Type Bi₂Te_2.7Se_0.3 through Incorporation of Amorphous Si₃N₄ Nanoparticles

Enhancing Thermoelectric Performance of n-Type Bi₂Te_2.7Se_0.3 through Incorporation of Amorphous Si₃N₄ Nanoparticles

Nanocomposite Strategy toward Enhanced Thermoelectric Performance in Bismuth Telluride

Grain Manipulation by Annealing Treatment Realizes High‐Performance N‐Type Bi₂Te_2.4Se_0.6 Thermoelectric Material and Device

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Enhanced thermoelectric properties of n-type Bi2Te2.7Se0.3 materials by TiO2 ceramic nanoparticle dispersion-induced energy filtering effect

Cited by 9 publications

References 41 publications

Enhancing Thermoelectric Performance of n-Type Bi2Te2.7Se0.3 through Incorporation of Amorphous Si3N4 Nanoparticles

Enhancing Thermoelectric Performance of n-Type Bi2Te2.7Se0.3 through Incorporation of Amorphous Si3N4 Nanoparticles

Nanocomposite Strategy toward Enhanced Thermoelectric Performance in Bismuth Telluride

Grain Manipulation by Annealing Treatment Realizes High‐Performance N‐Type Bi2Te2.4Se0.6 Thermoelectric Material and Device

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Enhancing Thermoelectric Performance of n-Type Bi₂Te_2.7Se_0.3 through Incorporation of Amorphous Si₃N₄ Nanoparticles

Enhancing Thermoelectric Performance of n-Type Bi₂Te_2.7Se_0.3 through Incorporation of Amorphous Si₃N₄ Nanoparticles

Grain Manipulation by Annealing Treatment Realizes High‐Performance N‐Type Bi₂Te_2.4Se_0.6 Thermoelectric Material and Device