Enhanced thermoelectric properties of Bi1.92Li0.08Sr2Co2Oy/x wt% SiC composites

IF 4.4 3区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR

Inorganic Chemistry Communications Pub Date : 2024-11-20 DOI:10.1016/j.inoche.2024.113596

K. Park , H.Y. Hong , S.Y. Gwon , E.C. Jeon , M.F.M. Sabri

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Abstract

In this work, Bi_1.92Li_0.08Sr₂Co₂O_y/x wt% SiC (1.0 ≤ x ≤ 4.0 wt%) composites are fabricated through a solid-state reaction followed by spark plasma sintering. The resulting composites exhibit plate-like grains and high density. The addition of SiC nanoparticles reduces electrical conductivity due to decreased hole mobility and increases the Seebeck coefficient due to an enhanced scattering factor and effective mass. Furthermore, the incorporation of SiC nanoparticles significantly enhances phonon scattering, thereby reducing phonon thermal conductivity. The Bi_1.92Li_0.08Sr₂Co₂O_y/2.0 wt% SiC composite exhibits the largest ZT of 0.17 at 973 K due to its high Seebeck coefficient and low thermal conductivity. Our results demonstrate that incorporating SiC nanoparticles is a highly effective strategy for enhancing the thermoelectric properties of Bi_1.92Li_0.08Sr₂Co₂O_y.

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Bi1.92Li0.08Sr2Co2Oy/x wt% SiC复合材料热电性能增强

在本研究中，通过固相反应和放电等离子烧结制备了Bi1.92Li0.08Sr2Co2Oy/x wt% SiC（1.0≤x≤4.0 wt%）复合材料。所得到的复合材料具有板状晶粒和高密度。SiC纳米颗粒的加入由于降低了空穴迁移率而降低了电导率，并且由于散射系数和有效质量的增强而增加了塞贝克系数。此外，SiC纳米颗粒的掺入显著增强了声子散射，从而降低了声子的导热性。Bi1.92Li0.08Sr2Co2Oy/2.0 wt% SiC复合材料由于具有较高的塞贝克系数和较低的导热系数，在973 K时ZT最大，为0.17。我们的研究结果表明，加入SiC纳米颗粒是提高Bi1.92Li0.08Sr2Co2Oy热电性能的有效策略。

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来源期刊

Inorganic Chemistry Communications 化学-无机化学与核化学

CiteScore

5.50

自引率

7.90%

发文量

1013

审稿时长

53 days

期刊介绍： Launched in January 1998, Inorganic Chemistry Communications is an international journal dedicated to the rapid publication of short communications in the major areas of inorganic, organometallic and supramolecular chemistry. Topics include synthetic and reaction chemistry, kinetics and mechanisms of reactions, bioinorganic chemistry, photochemistry and the use of metal and organometallic compounds in stoichiometric and catalytic synthesis or organic compounds.