Improved thermoelectric efficiency of Sb2Si2Te6 through yttrium-induced nanocompositing†

IF 2.9 3区 化学 Q3 CHEMISTRY, PHYSICAL
Kivanc Saglik, Xian Yi Tan, Jinfeng Dong, Ady Suwardi, Xizu Wang, Jianwei Xu, Qiang Zhu, Hongfei Liu, Jing Cao and Qingyu Yan
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Abstract

Sb2Si2Te6 is a promising 2D material for medium-temperature thermoelectric applications, with the thermoelectric figure of merit zT approaching 1 at 823 K. However, its widespread use has been limited by relatively low power factor values. In this study, we successfully enhanced the performance of Sb2Si2Te6 by introducing Yttrium nanocomposites. This modification fine-tuned the carrier concentration and electrical conductivity, and increased the power factor up to 946 μW K−1 at 570 K. Jonker plot analysis revealed that increased carrier concentration did not affect the intrinsic electronic properties. SEM and TEM analyses revealed that Y nano-compositing introduced secondary phases, reducing the lattice thermal conductivity to values close to simulated ones using the Debye–Callaway model. Sb1.98Y0.02Si2Te6 exhibited the highest zT of 1.49 at 773 K due to the ultralow lattice thermal conductivity of 0.29 W m−1 K−1 and a moderate power factor of 858 μW K−1 at the same temperature. The single parabolic band (SPB) model suggests that with further optimization of the Fermi level and additional reduction in lattice thermal conductivity, the zT value could potentially increase to 1.55. These results demonstrate the potential of Y nanocompositing for enhancing Sb2Si2Te6 as an efficient medium-temperature thermoelectric material.

Abstract Image

钇诱导纳米复合提高Sb2Si2Te6的热电效率
Sb2Si2Te6是一种很有前途的中温热电应用2D材料,在823 K时热电性能值zT接近1。然而,它的广泛使用受到相对较低的功率因数值的限制。在这项研究中,我们成功地通过引入Y纳米复合材料来增强Sb2Si2Te6的性能。这一改进对载流子浓度和电导率进行了微调,并在570K时将功率因数提高到946 μW/K。容克图分析表明,载流子浓度的增加不影响本征电子性质。SEM和TEM分析表明,钇纳米复合引入了二次相,使晶格导热系数降低到接近Debye Callaway模型的模拟值。Sb1.98Y0.02Si2Te6在773K时的zT最高,为1.49,这是由于在相同温度下晶格热导率为0.29 W/mK,功率因数为858 μW/K。单抛物带(SPB)模型表明,随着费米能级的进一步优化和晶格热导率的进一步降低,zT值有可能增加到1.55。这些结果证明了钇纳米复合材料增强Sb2Si2Te6作为高效中温热电材料的潜力。
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来源期刊
Physical Chemistry Chemical Physics
Physical Chemistry Chemical Physics 化学-物理:原子、分子和化学物理
CiteScore
5.50
自引率
9.10%
发文量
2675
审稿时长
2.0 months
期刊介绍: Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.
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