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n-type thermoelectric material Mg2Sn0.75Ge0.25 for high power generation

机译:用于大功率发电的n型热电材料Mg2Sn0.75Ge0.25

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摘要

Thermoelectric power generation is one of the most promising techniques to use the huge amount of waste heat and solar energy. Traditionally, high thermoelectric figure-of-merit, ZT, has been the only parameter pursued for high conversion efficiency. Here, we emphasize that a high power factor (PF) is equivalently important for high power generation, in addition to high efficiency. A new n-type Mg2Sn-based material, Mg2Sn0.75Ge0.25, is a good example to meet the dual requirements in efficiency and output power. It was found that Mg2Sn0.75Ge0.25 has an average ZT of 0.9 and PF of 52 μW⋅cm−1⋅K−2 over the temperature range of 25–450 °C, a peak ZT of 1.4 at 450 °C, and peak PF of 55 μW⋅cm−1⋅K−2 at 350 °C. By using the energy balance of one-dimensional heat flow equation, leg efficiency and output power were calculated with Th = 400 °C and Tc = 50 °C to be of 10.5% and 6.6 W⋅cm−2 under a temperature gradient of 150 °C⋅mm−1, respectively.
机译:热电发电是利用大量废热和太阳能的最有前途的技术之一。传统上,高热电品质因数ZT是追求高转换效率的唯一参数。在这里,我们强调高功率因数(PF)除具有高效率外,对于高功率发电同样重要。一种新型的基于Ng的Mg2Sn基材料Mg2Sn0.75Ge0.25是满足效率和输出功率双重要求的一个很好的例子。发现在25–450的温度范围内,Mg2Sn0.75Ge0.25的平均ZT为0.9,PF为52μW⋅cm -1 ⋅K −2 °C,在450°C时的ZT峰值为1.4,在350°C时的PF峰值为55μW⋅cm -1 ⋅K -2 。通过使用一维热流方程的能量平衡,在Th = 400°C和Tc = 50°C的情况下计算出腿效率和输出功率分别为10.5%和6.6 W·cm −2 分别在150°C⋅mm -1 的温度梯度下进行。

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