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无机材料学报

• 研究论文 •    

微球状Ag2Se的溶剂热合成及其热电性能研究

缪鹏程1, 王丽君1, 沈紫怡1, 黄莉1, 袁宁一1, 丁建宁2   

  1. 1.常州大学 材料科学与工程学院,江苏省光伏科学与工程协同创新中心,常州213164;
    2.扬州大学 机械工程学院,扬州 225127
  • 收稿日期:2025-01-25 修回日期:2025-04-02
  • 通讯作者: 王丽君, 讲师. E-mail: wanglj@cczu.edu.cn; 丁建宁, 教授. E-mail: dingjn@yzu.edu.cn
  • 作者简介:缪鹏程(1999–), 男, 硕士研究生. E-mail: 1131263037@qq.com
  • 基金资助:
    江苏省科技创新专项基金 (BE2022610)

Solvothermal Synthesis of Micro-spherical Ag2Se and Its Thermoelectric Properties

MIAO Pengcheng1, WANG Lijun1, SHEN Ziyi1, HUANG Li1, YUAN Ningyi1, DING Jianning2   

  1. 1. Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, School of Material Science & Engineering, Changzhou University, Changzhou 213164, China;
    2. School of Mechanical Engineering, Yangzhou University, Yangzhou 225127, China
  • Received:2025-01-25 Revised:2025-04-02
  • Contact: WANG Lijun, lecturer. E-mail: wanglj@cczu.edu.cn; DING Jianning, professor. E-mail: dingjn@yzu.edu.cn
  • About author:MIAO Pengcheng (1999–), male, Master candidate. E-mail: 1131263037@qq.com
  • Supported by:
    The Special Fund for Science and Technology Innovation of Jiangsu Province (BE2022610)

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摘要： 热电材料可直接将热能转化为电能,在废热回收领域具有广泛的应用前景。Ag2Se作为一种新型低温热电材料,因其独特的晶体结构和优异的电输运性能备受关注。本研究采用溶剂热法成功制备了微米级Ag2Se粉末,该方法可精确控制粉末的结构、成分及晶粒尺寸。结果表明,所合成的Ag2Se粉末呈现均一的微米柱状结构,其晶体结构完整,Ag与Se的比例接近理论值(原子比约2 : 1)。利用放电等离子烧结(SPS)技术,在不同温度下对Ag2Se粉末进行致密化处理,结果显示烧结温度对其微观结构和热电性能具有显著影响。473 K烧结样品断面较为致密,而573和673 K烧结样品中均出现了纳米孔结构,其中673 K烧结样品中纳米孔结构尤为明显,有效降低了材料的晶格热导率(κl),其室温κl降至0.14 W·m-1·K-1。最终,573 K烧结条件下制得的Ag2Se块体展现出最佳热电性能,室温热电优值(ZT)达到0.50。本研究不仅证明了溶剂热法在制备高性能微米级热电粉末中的可行性,也为进一步优化Ag2Se热电材料的微观结构与热电性能提供了有价值的实验依据。

关键词: Ag2Se, 热电性能, 溶剂热法, 放电等离子烧结

Abstract: Thermoelectric materials can directly convert thermal energy into electrical energy, offering significant potential for waste heat recovery applications. Ag2Se as a novel low-temperature thermoelectric material has attracted considerable attention due to its unique crystal structure and excellent electronic transport properties. In this study, micro-sized Ag2Se powders were synthesized via solvothermal method, which contributes to precise control over the powders’ structure, composition, and grain size. The results indicate that the synthesized Ag2Se powders exhibit uniform micro-columnar structure with complete crystal lattice, and the Ag-to-Se ratio is close to the theoretical value (approximately 2 : 1 (in atom)). Furthermore, spark plasma sintering (SPS) was employed to densify the Ag2Se powders at various temperatures, and the findings reveal that the sintering temperature has a significant impact on the microstructure and thermoelectric performance. The fracture surface of the sample sintered at 473 K is relatively dense, whereas samples sintered at 573 and 673 K display the emergence of nanopores. Notably, the nanopores are particularly pronounced in the sample sintered at 673 K, which effectively reduces the material’s lattice thermal conductivity (κl) to 0.14 W·m⁻¹·K⁻¹ at room temperature. Ultimately, the Ag2Se bulk prepared under a sintering temperature of 573 K exhibited the best thermoelectric performance, achieving a room-temperature thermoelectric figure of merit (ZT) of 0.50. This study not only demonstrates the feasibility of the solvothermal method for fabricating high-performance micro-sized thermoelectric powders but also provides valuable experimental evidence for further optimizing the microstructure and thermoelectric properties of Ag2Se materials.

Key words: Ag2Se, thermoelectric property, solvothermal method, spark plasma sintering

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