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颗粒大小和空间体积分数变化对基于ZnO的功能分级热电器件的影响

Shardul Rai¹, Kshitij Kumar Sharma², Abhishek Tewari²

¹School of Engineering, Shiv Nadar Institution of Eminence Deemed to be University, Gautam Buddha Nagar, 201314, India.

Scientific reports

|December 13, 2025

概括

优化基于氧化 (ZnO) 的功能分级热电器 (FGTED) 需要仔细控制颗粒大小分布. 具有较高体积分量的较大颗粒显著提高了输出功率和设备性能.

科学领域:

材料科学材料科学材料科学
热力学是一种热力学.
纳米技术纳米技术

背景情况:

功能级热电器件 (FGTED) 提供可调节的性能,以提高能量转换.
热电材料的性能高度敏感于它们的微观结构,包括颗粒大小和分布.
氧化 (ZnO) 是热电应用的一个有前途的材料,因为它的丰富性和无毒性.

研究的目的:

开发和使用结合的分析-有限元模型来研究空间变化的 ZnO 颗粒大小和体积分数对 FGTED 性能的影响.
确定最佳的颗粒大小分布,以最大限度地提高功率输出,并在基于ZnO的FGTED中获得优点.
对影响FGTED性能的关键材料特性进行灵敏度分析.

主要方法:

开发一种新的结合分析和有限元模型.
模拟ZnO颗粒体积分数分布,使用具有不同参数的功率定律函数 (n).
在温度范围 (120K至675K) 和颗粒大小 (0.18μm至5.75μm) 中分析设备性能.

主要成果:

具有较大的 ZnO 颗粒体积分数较高的 FGTED 显示出明显更大的功率输出.
实现了2.6341×10−4W的最大输出功率和0.006的345K的峰值功率.
电阻被确定为对输出功率最有影响的参数,其次是西贝克系数和热导率.

结论:

这项研究强调了颗粒大小分布在优化基于ZnO的FGTED性能方面的关键作用.
开发的模型为设计和优化先进的热电设备提供了有价值的工具.
定制微观结构,特别是颗粒大小和体积分数,对于最大限度地提高热电能转换效率至关重要.

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