Batch Fabrication and Interface Stabilization Accelerate Application of Skutterudite Thermoelectric Module for Power Generation,Advanced Energy Materials

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Batch Fabrication and Interface Stabilization Accelerate Application of Skutterudite Thermoelectric Module for Power Generation
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2024-02-06 , DOI: 10.1002/aenm.202303698
Wenjing Shi ₁ , Dandan Qin ₂ , Yuxin Sun ₁ , Hao Wu ₁ , Haoyang Tong ₁ , Liangjun Xie ₁ , Zihang Liu ₁ , Qian Zhang ₃ , Wei Cai ₁ , Fengkai Guo ₁ , Jiehe Sui ₁

Affiliation

To achieve the commercial application of high-performance skutterudite (SKD) thermoelectric (TE) devices, breakthroughs in the batch fabrication of TE material and the realization of its stable bonding to the barrier layer are necessary. In this work, the large-scale SKD bulks with excellent TE performance and decent homogeneity are prepared by melt-spinning (MS) combined with a hot pressing process. Then, a modified two-step sintering method is employed to effectively suppress the degree of initial interfacial reaction, resulting in a barrier layer/SKD joint that exhibits low contact resistivity (≈2µΩ·cm²) and high bonding strength (≈30 MPa) with no significant change after aging at 773 K for 30 days. Encouragingly, the joints welded with Mo₅₀Cu₅₀ electrodes also show high stability under the same aging conditions. Finally, the as-fabricated 8-pair module shows a highly competitive conversion efficiency of 9% under a temperature difference of 580 K. In addition, during a 360 h aging test with hot-side temperature of 773 K, the module shows excellent stability. Overall, this work paves the way for batch fabrication of high-performance SKD using MS and lays a solid foundation for the stable operation of SKD-based modules.

中文翻译：

批量制造和界面稳定加速方钴矿热电模块在发电中的应用

为了实现高性能方钴矿（SKD）热电（TE）器件的商业化应用，必须在TE材料的批量制造方面取得突破并实现其与势垒层的稳定键合。在这项工作中，通过熔体纺丝（MS）结合热压工艺制备了具有优异TE性能和良好均匀性的大型SKD块体。然后，采用改进的两步烧结方法有效抑制初始界面反应程度，从而形成具有低接触电阻率（≈2μΩ·cm ²）和高结合强度（≈30 MPa）的阻挡层/SKD接头773 K 老化 30 天后无明显变化。令人鼓舞的是，用Mo ₅₀ Cu ₅₀电极焊接的接头在相同时效条件下也表现出高稳定性。最终，制成的8对组件在580 K温差下表现出极具竞争力的9%转换效率。此外，在热端温度773 K的360小时老化测试中，组件表现出优异的稳定性。总体而言，这项工作为利用MS批量制造高性能SKD铺平了道路，并为基于SKD的模块的稳定运行奠定了坚实的基础。

更新日期：2024-02-06

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