瞬态液体诱导的层次结构有助于高热电性能在Ag2Se
Peeranut Kitthonbancha1,2, Wei-Di Liu2, Meng Li2
1Materials Science and Nanotechnology Program, Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand.
Small (Weinheim an der Bergstrasse, Germany)
|February 12, 2025
概括
银化物 (Ag2Se) 显示出作为热电材料的前景. 在冷烧结过程中使用硫化 (Na2SO3) 溶液创建了一个层次结构,在室温下显著提高了热电性能.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 纳米技术 纳米技术
背景情况:
- 银化物 (Ag2Se) 是一个有前途的热电材料,用于室温附近的应用.
- 传统的基于比斯穆特化物 (Bi2Te3) 的材料面临着局限性.
研究的目的:
- 为了提高Ag2Se.Se的热电性能.
- 通过修改的冷烧结工艺,在Ag2Se中设计一个层次结构.
主要方法:
- 改性冷烧结工艺,使用硫酸 (Na2SO3) 溶液作为过渡液体.
- 结构性特征,以识别层次性的多孔性 (微,纳米,亚纳米孔) 和残余相.
- 测量热电性质,包括晶格导热率和功率因子.
主要成果:
- 在Ag2Se.中成功诱导了具有多个孔径和Na2SO3残留物的等级结构.
- 超低晶格导热率为0.18 W m-1 K-1 在~300 K 达到.
- 由于Se空缺的优化载体度导致高功率系数为~25μW cm−1 K−2.2.
- 对于Ag2Se-30%Na2SO3.3,获得了1.04的室温功率 (ZT) 的记录.
结论:
- 经过修改的冷烧结工艺,使用瞬态液体溶液,在结构工程中是有效的.
- 层次结构显著降低了格子导热率.
- 功率因子和热导率的协同增强导致Ag2Se的优越热电性能.
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