高密度拉斯双子导致Bi2Te3模块中的高热电转换效率
Qianqian Sun1,2, Gang Wu1, Xiaojian Tan1,2
1Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China. tanxiaojian@nimte.ac.cn.
Materials horizons
|October 28, 2024
概括
这项研究使用一种新的兴奋剂策略来增强木化物热电发生器. 组合的兴奋剂提高了性能和耐久性,以获得高效的低级热收获.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 收集能源 收集能源
背景情况:
- 基于比斯穆特化物 (Bi2Te3) 的热电发电机是低等级热收获的关键.
- 优化热电性能需要精确控制材料的微观结构和特性.
研究的目的:
- 开发一种使用Ag9GaTe6中的Ag和Ga的组合兴奋剂策略,以提高p型Bi0.4Sb1.6Te3.3的ZT值.
- 研究这种兴奋剂对微观结构,导热率,功率因子和机械硬度的影响.
主要方法:
- 使用Ag和Ga (在Ag9GaTe6中) 的组合兴奋剂策略应用于p型Bi0.4Sb1.6Te3.3.
- 进行了微结构分析,以确定声子散射中心.
- 测量了热电特性 (ZT,功率系数,导热率) 和维克尔硬度.
主要成果:
- 兴奋剂策略引入了多个声子散射中心 (拉斯双胞胎,三连接边界,富含Sb的纳米沉),抑制了格子导热率到0.50 W m-1 K-1.1.
- 提高室温功率系数为48.8μW cm−1 K−2和维克尔硬度为0.90 GPa.
- 在350K时达到1.40的峰值ZT,在300-500K时达到1.24的平均ZT (ZTave).
结论:
- 这种新的兴奋剂方法显著提高了基于Bi2Te3的材料的热电性能和机械稳定性.
- 一个17联热电模块在ΔT=200K时实现了6.5%的转换效率,在30个热循环后输出稳定.
- 这项工作展示了对高效和耐用的热电能收集装置的有希望的策略.
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