由Sb2Te3基热电驱动的强大的同质分段发电机
Min Wang1,2, Qiang Zhang1,3, Kaikai Pang1,3
1Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China.
Advanced materials (Deerfield Beach, Fla.)
|April 3, 2025
概括
这项研究通过将Sb2Te3与Cd和S进行合来增强热电 (TE) 材料,显著提高低级热回收效率. 新材料的峰值ZT为1.1%,发电机效率为9.3%.
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:
- 热电 (TE) 技术对于废热回收至关重要,特别是在低级热 (<650 K) 方面.
- 传统的Bi2Te3合金具有有限的TE效率 (<7%) 和狭窄的操作温度范围.
- 需要先进的TE材料,以提高实际应用的效率和机械性能.
研究的目的:
- 通过兴奋剂增强Sb2Te3基材料的热电性能.
- 研究 (Cd) 和硫 (S) 兴奋剂对微观结构和热电特性的影响.
- 开发一台高效的热电发电机,用于低档废热采集.
主要方法:
- 微结构工程通过使用Cd和S的Sb2Te3进行兴奋剂.
- 格子导热率,状态密度有效质量和带间隙的表征.
- 使用优化的Bi-Sb-Te合金制造和测试一个细分热电发电机.
主要成果:
- 用Cd和S进行兴奋剂,在300K时将网格导热率降低了45%.
- Cd0.04Sb1.96Te2.94S0.06样本在650K时达到1.1的峰值值值 (ZT).
- 一个细分的TE发电机在350K温度梯度下证明了9.3%的认证效率.
- 该材料具有出色的机械强度 (压力为197 MPa,曲为56 MPa).
结论:
- Cd 和 S 兴奋剂有效调节 Sb2Te3 的微结构,增强热电性质.
- 开发的材料显示出有效的低度废热回收的巨大潜力.
- 这项研究扩大了基于Bi2Te3的热电的操作温度,并为实际的TE发电提供了可行的途径.
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