单阶段热电设备的电子和热性质的协同优化
Jianglong Zhu1, Ruiheng Li1, Xiaobo Tan1
1Key Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China.
Journal of the American Chemical Society
|September 30, 2025
概括
研究人员使用GeTe合金开发了一种无热电装置,实现了14.1%的转换效率. 这种热电发电机的突破利用了先进的材料工程来提高废热回收.
科学领域:
- 材料科学
- 固态物理
- 能源转换
背景情况:
- 热电发电机 (TEG) 将废热转化为电力,但由于转化效率低 (η) 而受到限制.
- 开发高效的无热电材料对于可持续的能源解决方案至关重要.
- 合金具有潜力,但需要优化以实现高性能.
研究的目的:
- 开发一种高效率的无热电装置.
- 研究有序-无序状态调制和多频段工程对热电性能的影响.
- 建立先进热电技术的设计范式.
主要方法:
- 使用无GeTe合金制造一个单质的7对装置.
- 实施有序-无序状态调制和多频段工程策略.
- 热电性质的表征,包括转换效率,功率密度和功率值 (ZT).
主要成果:
- 在 ΔT = 460 K 实现了 14.1% 的显著转换效率 (η) 和 2.19 W cm-2 的功率密度.
- 通过多频段工程优化载体有效质量和流动性,抑制间隔散射.
- 在703K达到2.6的最大优点 (ZT) 和303-803K的平均ZT为1.7.
- 通过缺陷和障碍工程将格子导热率降低到无形极限.
结论:
- 材料策略的协同整合显著提高了热电性能.
- 开发的无GeTe装置表明了高性能废热回收的有希望的途径.
- 这项研究为高效和环保的热电发电机提供了一个新的设计范式.
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