Effects of incorporating pyrite-analogous CoSe2 on the thermoelectric properties of TiS2

IF 5.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2024-09-07 DOI:10.1016/j.jallcom.2024.176410

Hui Liu , Anqi Zhao , Lin Pan , Tao Sun , Jiamin Cai , Changchun Chen , Yifeng Wang

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Abstract

In this study, we delved into the thermoelectric characteristics of TiS₂ - x mol% CoSe₂ composites, with x varying from 0 to 3. The incorporation of a modest quantity of CoSe₂ prominently enhanced the grain orientation of TiS₂. Nevertheless, a subsequent increase in CoSe₂ content led to a rapid deterioration of the TiS₂ grain orientation. The electrical conductivity σ exhibited an initial surge followed by a decline upon the addition of CoSe₂. Conversely, the absolute Seebeck coefficient |S| initially decreased and then rose. Notably, the power factor PF of TiS₂ peaked at 14.4 μWcm⁻¹K⁻² upon the inclusion of 2 mol% CoSe₂, marking a substantial 1.7-fold enhancement compared to pristine TiS₂. Furthermore, the thermal conductivity κ of TiS₂ was effectively suppressed by the addition of CoSe₂. Consequently, TiS₂ - 2 mol% CoSe₂ achieved a ZT_max value of 0.59 at 673 K, representing a noteworthy 1.8-fold increase over pristine TiS₂.

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加入黄铁矿类似物 CoSe2 对 TiS2 热电性能的影响

在这项研究中，我们深入研究了 TiS2 - x mol% CoSe2 复合材料的热电特性，其中 x 在 0 到 3 之间变化。然而，随着 CoSe2 含量的增加，TiS2 的晶粒取向迅速恶化。添加 CoSe2 后，电导率 σ 出现了先上升后下降的现象。相反，绝对塞贝克系数 |S| 最初下降，然后上升。值得注意的是，加入 2 mol% CoSe2 后，TiS2 的功率因数 PF 达到 14.4 μWcm-1K-2 的峰值，与原始 TiS2 相比大幅提高了 1.7 倍。此外，加入 CoSe2 后，TiS2 的热导率 κ 被有效抑制。因此，TiS2 - 2 mol% CoSe2 在 673 K 时的 ZTmax 值为 0.59，比原始 TiS2 提高了 1.8 倍。

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.