Improved Thermoelectric Efficiency of Sb2Si2Te6 Through Yttrium-Induced Nanocompositing

IF 2.9 3区化学 Q3 CHEMISTRY, PHYSICAL

Physical Chemistry Chemical Physics Pub Date : 2024-12-09 DOI:10.1039/d4cp04219k

Kivanc Saglik, Xian Yi Tan, Jinfeng Dong, Ady Suwardi, Xi Zu Wang, Jianwei Xu, Qiang Zhu, Hongfei Liu, Cao Jing, Qingyu Yan

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引用次数: 0

Abstract

Sb2Si2Te6 is a promising 2D material for medium-temperature thermoelectric applications, with a 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 Y nanocomposites. This modification fine-tuned the carrier concentration, electrical conductivity, and increased the power factor up to 946 μW/K at 570K. Jonker plot analysis revealed that increased carrier concentration did not affect the intrinsic electronic properties. SEM and TEM analyses revealed that Yttrium 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 773K due to the ultralow lattice thermal conductivity of 0.29 W/mK and moderate power factor of 858 μW/K at the same temperature. 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 Yttrium nanocompositing for enhancing Sb2Si2Te6 as an efficient medium-temperature thermoelectric material.

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来源期刊

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.