通过谷物边界工程来提高热电材料与灵活性之间的兼容性
Ruopu Liu1, Li Ma1, Luping Song1,2
1Institute of Materials, China Academy of Engineering Physics, Jiangyou, Sichuan, 621908, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|September 19, 2025
概括
基于高 bismuth telluride (Bi2Te3) 的柔性热电器件 (F-TED) 实现了高性能和稳定性. 优化的F-TED显示出可穿戴应用的优异的能量转换和机械可靠性.
科学领域:
- 材料科学 材料科学 材料科学
- 能源科学 能源科学
- 纳米技术 纳米技术
背景情况:
- 热电设备 (TED) 需要高能转换和灵活性,以适用于更广泛的应用.
- 在TED中,优化性能与灵活性之间的兼容性至关重要.
- 基于比斯木化物 (Bi2Te3) 的材料对热电应用具有前景.
研究的目的:
- 开发具有卓越的能量转换性能的高度灵活的热电设备 (F-TED).
- 在基于Bi2Te3的材料中保持高无维图功率 (ZT) 值,同时提高灵活性.
- 通过结构优化,提高F-TED在可穿戴应用中的实用性.
主要方法:
- 合成的p型Bi0.5Sb1.5Te3材料具有修改的颗粒大小,以增强声子散射.
- 制造了一种200对灵活的热电装置 (F-TED),使用基于Bi2Te3的成分.
- 评估了热电性能 (ZT,开放电路电压,功率密度) 和机械稳定性 (拉伸,曲).
主要成果:
- 对于p型Bi0.5Sb1.5Te3材料,在373K达到1.2的最大ZT值.
- 通过修改颗粒大小,减少热导率,增强声子散射.
- 在73K的温度差异下,提供了3.0V的开放电路电压和13.8mWcm-2功率密度的F-TED.
- 经过曲试验 (5毫米半径) 证明了出色的电稳定性和结构可靠性.
- 设备的高度和重量分别减少了70%和75%,提高了舒适度.
结论:
- 开发的基于Bi2Te3的F-TED显示了高热电性能和机械灵活性的令人信服的平衡.
- 结构优化,包括降低腿高和高密度策略,显著提高了可穿戴应用的设备实用性.
- 这些发现为可穿戴技术中的先进,舒适和可靠的热电发电机铺平了道路.
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