在自合成的NiSe/AgBiSe2中具有高热电性能,在n型AgBiSe2中通过注Ni的异构复合材料中具有高热电性能
Chaoxin Qiu1,2,3, Cong Xiao1,2, Wei Ren1,2,3
1Jiangxi Provincial Key Laboratory of Magnetic Metallic Materials and Devices/Ganzhou Key Laboratory for Rare Earth Magnetic Functional Materials and Physics, College of Rare Earths, Jiangxi University of Science and Technology, Ganzhou, China.
Small (Weinheim an der Bergstrasse, Germany)
|February 10, 2026
概括
融入AgBiSe2形成了NiSe/AgBiSe2异构,显著提高了热电性能. 这种复合材料工程策略提高了功率 (ZT) 和功率因子,同时降低了先进热电材料的导热率.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 能源转换 能源转换
背景情况:
- 银芝麻化物 (AgBiSe2) 是一种有前途的n型热电材料,用于中温应用.
- 性能提升的有限策略阻碍了其广泛使用.
- 开发新型复合材料对于推进热电技术至关重要.
研究的目的:
- 通过Ni的结合和异构结构的形成,增强AgBiSe2的热电性能.
- 调查负责改善电气和热传输特性的潜在机制.
- 探索用于高性能n型热电材料的新复合材料工程策略.
主要方法:
- NiSe/AgBiSe2异构复合物的自合成通过的加入.
- 结构性,电气性和热传输性能的表征.
- 对电荷载体度和声子散射机制的分析.
主要成果:
- 在783K的Ag0.985Ni0.015BiSe2.2中,在优点 (ZT ~1) 的数字中实现了~129%的增强.
- 在783 K的Ag0.94Ni0.06BiSe2.2.时,电导率增加了约250%,功率因子增加了98.6% (~4.9μW cm−1 K−2).
- 实现了超低的晶格导热率 (~0.13-0.17 W m-1 K-1 在783 K),~60%的减少,归因于多维缺陷和声子散射.
- 由于空位,电荷转移和Ni2+兴奋剂,观察到增强的载体度 (nH).
- 在现场沉的NiSe相有效地解了电导率 (σ) 和Seebeck系数 (S),进一步提高了功率因子.
- 达到了最大的理论热电转换效率 (ηmax) ~5.72%.
结论:
- NiSe/AgBiSe2异构结构提供了一种可行的策略,可以显著提高n型AgBiSe2的热电性能.
- 增强的电传输和抑制的晶格导热的联合效应是改进ZT的关键.
- 这种复合材料工程方法为开发高效的中温热电材料提供了一条新的途径.
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