银纳米颗粒沉淀冷烧结工艺提高Ag<sub>2</sub>Se热电效率

Dejwikom Theprattanakorn; Thanayut Kaewmaraya; Supree Pinitsoontorn

doi:10.1007/s12613-024-2973-x

Volume 31 Issue 12

Dec. 2024

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文章导航 > 矿物冶金与材料学报（英文） > 2024 > 31(12): 2760-2769

Dejwikom Theprattanakorn, Thanayut Kaewmaraya, and Supree Pinitsoontorn, Boosting thermoelectric efficiency of Ag₂Se through cold sintering process with Ag nano-precipitate formation, Int. J. Miner. Metall. Mater., 31(2024), No. 12, pp. 2760-2769. https://doi.org/10.1007/s12613-024-2973-x

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Dejwikom Theprattanakorn, Thanayut Kaewmaraya, and Supree Pinitsoontorn, Boosting thermoelectric efficiency of Ag2Se through cold sintering process with Ag nano-precipitate formation, Int. J. Miner. Metall. Mater., 31(2024), No. 12, pp. 2760-2769. https://doi.org/10.1007/s12613-024-2973-x

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研究论文

银纳米颗粒沉淀冷烧结工艺提高Ag₂Se热电效率

1)
Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
2)
Institute of Nanomaterials Research and Innovation for Energy (IN-RIE), Khon Kaen University, Khon Kaen 40002, Thailand

通讯作者:
Supree Pinitsoontorn E-mail: psupree@kku.ac.th

中文摘要

硒化银(Ag₂Se)是一种极具潜力的近室温热电(TE)材料。本研究提出了一种在较低温度(170°C)下，以AgNO₃溶液为瞬态液体，通过冷烧结工艺(CSP)制备块状Ag₂Se新方法并考察AgNO₃对其微观结构和TE性能的影响。物相成分和微观结构分析结果表明：AgNO₃的加入诱导Ag₂Se基体中Ag纳米颗粒沉淀形成，该沉淀颗粒不影响正交相β-Ag₂Se晶体结构，抑制了晶体的生长，导致晶体尺寸减小。含有银纳米沉淀颗粒样品具有高孔隙率和低堆积密度，电导率显著提高，塞贝克系数略有下降，平均功率因数较纯Ag₂Se的1540 μW⋅m⁻¹⋅K⁻²增加至1670 μW⋅m⁻¹⋅K⁻²，但过量添加AgNO₃对功率因数不利。此外，利用AgNO₃通过CSP制备的Ag₂Se由于晶体界面、孔隙和Ag纳米颗粒沉淀处的声子散射增强，其热导率被有效抑制。在CSP制造过程中，添加Ag质量分数0.5%的Ag₂Se在300 K时达到了最高zT值(0.92)，相较于不添加Ag的Ag₂Se提高20%以上。本研究为定制块状Ag₂Se的微观结构和提高室温TE性能提供了一种有效策略。

关键词:

Research Article

Boosting thermoelectric efficiency of Ag₂Se through cold sintering process with Ag nano-precipitate formation

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Abstract

Abstract

Silver selenide (Ag₂Se) stands out as a promising thermoelectric (TE) material, particularly for applications near room temperatures. This research presents a novel approach for the fabrication of bulk Ag₂Se samples at a relatively low temperature (170°C) using the cold sintering process (CSP) with AgNO₃ solution as a transient liquid agent. The effect of AgNO₃ addition during CSP on the microstructure and TE properties was investigated. The results from phase, composition and microstructure analyses showed that the introduction of AgNO₃ solution induced the formation of Ag nano-precipitates within the Ag₂Se matrix. Although the nano-precipitates do not affect the phase and crystal structure of orthorhombic β-Ag₂Se, they suppressed crystal growth, leading to reduced crystallite sizes. The samples containing Ag nano-precipitates also exhibited high porosity and low bulk density. Consequently, these effects contributed to significantly enhanced electrical conductivity and a slight decrease in the Seebeck coefficient when small Ag concentrations were incorporated. This resulted in an improved average power factor from ~1540 µW·m⁻¹·K⁻² for pure Ag₂Se to ~1670 µW·m⁻¹·K⁻² for Ag₂Se with additional Ag precipitates. However, excessive Ag addition had a detrimental effect on the power factor. Furthermore, thermal conductivity was effectively suppressed in Ag₂Se fabricated using AgNO₃-assisted CSP, attributed to enhanced phonon scattering at crystal interfaces, pores, and Ag nano-precipitates. The highest figure-of-merit (zT) of 0.92 at 300 K was achieved for the Ag₂Se with 0.5wt% Ag during CSP fabrication, equivalent to >20% improvement compared to the controlled Ag₂Se without extra Ag solution. Thus, the process outlined in this study presents an effective strategy to tailor the microstructure of bulk Ag₂Se and enhance its TE performance at room temperature.
- thermoelectric;
- silver selenide;
- chalcogenide;
- cold sintering process;
- nano-precipitate

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银纳米颗粒沉淀冷烧结工艺提高Ag₂Se热电效率

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Boosting thermoelectric efficiency of Ag₂Se through cold sintering process with Ag nano-precipitate formation

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银纳米颗粒沉淀冷烧结工艺提高Ag2Se热电效率

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Boosting thermoelectric efficiency of Ag2Se through cold sintering process with Ag nano-precipitate formation

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银纳米颗粒沉淀冷烧结工艺提高Ag₂Se热电效率

Boosting thermoelectric efficiency of Ag₂Se through cold sintering process with Ag nano-precipitate formation