High efficiency GeTe-based materials and modules for thermoelectric power generation,Energy & Environmental Science

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High efficiency GeTe-based materials and modules for thermoelectric power generation
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2020-12-23 , DOI: 10.1039/d0ee02791j
Tong Xing _{1,

2,

3} , Qingfeng Song _{1,

2,

3} , Pengfei Qiu _{1,

2,

3,

4,

5} , Qihao Zhang _{1,

2,

3} , Ming Gu _{1,

2,

3} , Xugui Xia _{1,

2,

3} , Jincheng Liao _{1,

2,

3} , Xun Shi _{1,

2,

3,

6,

7} , Lidong Chen _{1,

2,

3,

6,

7}

Affiliation

GeTe-Based materials have great potential to be used in thermoelectric generators for waste heat recovery due to their excellent thermoelectric performance, but their module research is greatly lagging behind material research. In this work, we successfully fabricate a GeTe-based thermoelectric module and report a high energy conversion efficiency of 7.8% under a temperature gradient of 500 K. An Sb-, Bi-, and Se-doped GeTe-based material, with a chemical composition of Ge_0.92Sb_0.04Bi_0.04Te_0.95Se_0.05 and a peak ZT of 2.0 at 700 K, is used to make the p-type legs in the module. By using a high-throughput strategy, Mo is screened from 12 pure metals as an effective diffusion barrier material between the GeTe-based material and the electrode. Based on the optimal geometry predicted by three-dimensional numerical analysis, one eight-couple Ge_0.92Sb_0.04Bi_0.04Te_0.95Se_0.05/Yb_0.3Co₄Sb₁₂ TE module is fabricated and evaluated, which shows a comparable energy conversion efficiency with those of skutterudite- and half-Heusler-based modules in a similar temperature range. This study opens the door for the development of GeTe-based modules.

中文翻译：

高效的基于GeTe的热电发电材料和模块

基于GeTe的材料具有出色的热电性能，在废热回收中具有巨大的潜力，可用于热电发电机，但是其模块研究大大落后于材料研究。在这项工作中，我们成功地制造了基于GeTe的热电模块，并报告了在500 K的温度梯度下具有7.8％的高能量转换效率。Sb，Bi和Se掺杂的GeTe基材料具有化学成分锗的组合物_0.92锑_0.04铋_0.04碲_0.95硒_0.05和峰值ZT在700 K时为2.0，用于在模块中制作p型支脚。通过使用高通量策略，从12种纯金属中筛选出Mo，以此作为基于GeTe的材料和电极之间的有效扩散阻挡材料。根据三维数值分析预测的最佳几何形状，制造并评估了一个八对Ge _0.92 Sb _0.04 Bi _0.04 Te _0.95 Se _0.05 / Yb _0.3 Co ₄ Sb ₁₂ TE模块，其能量转换效率可与那些相似温度范围内基于方钴矿和基于半霍斯勒的模块的制造。这项研究为基于GeTe的模块的开发打开了大门。

更新日期：2021-01-13

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