Grain Boundary Engineering for Achieving High Thermoelectric Performance in n-Type Skutterudites
Xianfu Meng,Zihang Liu,Bo Cui,Dandan Qin,Huiyuan Geng,Wei Cai,Liangwei Fu,Jiaqing He,Zhifeng Ren,Jiehe Sui +9 more
TLDR
In this paper, a liquid phase compaction method is used to fabricate low-angle grain boundaries with dense dislocation arrays, which shows the typical feature of lowangle grain boundary with denser dislocation array.Abstract:
Grain or phase boundaries play a critical role in the carrier and phonon transport in bulk thermoelectric materials. Previous investigations about controlling boundaries primarily focused on the reducing grain size or forming nanoinclusions. Herein, liquid phase compaction method is first used to fabricate the Yb-filled CoSb3 with excess Sb content, which shows the typical feature of low-angle grain boundaries with dense dislocation arrays. Seebeck coefficients show a dramatic increase via energy filtering effect through dislocation arrays with little deterioration on the carrier mobility, which significantly enhances the power factor over a broad temperature range with a high room-temperature value around 47 μW cm−2 K−1. Simultaneously, the lattice thermal conductivity could be further suppressed via scattering phonons via dense dislocation scattering. As a result, the highest average figure of merit ZT of ≈1.08 from 300 to 850 K could be realized, comparable to the best reported result of single or triple-filled Skutterudites. This work clearly points out that low-angle grain boundaries fabricated by liquid phase compaction method could concurrently optimize the electrical and thermal transport properties leading to an obvious enhancement of both power factor and ZT.read more
Citations
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Entropy Engineering in Tellurium-Free Thermoelectric Cu8GeSe6 with a Stable Cubic Structure
Wei Wang,Zizhen Zhou,Sikang Zheng,Qihong Xiong,Xuan Hu,Bin Zhang,Guiwen Wang,Guoyu Wang,Xu Lu,Xiaoyuan Zhou +9 more
TL;DR: In this article , the phase transition temperature of cubic argyrodite-type thermoelectrics was suppressed by employing the entropy engineering strategy through S alloying on the Se site, so that the stable cubic phase was maintained in the whole operating temperature region.
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Tailoring the phase transition of silver selenide at the atomistic scale.
Chen Luo,Zuoyuan Dong,Tao Xu,Xin Yang,Hui Zhang,Hengchang Bi,Chaolun Wang,Litao Sun,J. H. Chu,Xifeng Wu +9 more
TL;DR: In this article , the phase transition process of Ag2Se materials with various sizes was tailored towards low temperatures by tuning the motion of the atoms near the surface using size-dependent surface energy.
Journal ArticleDOI
Enhanced thermoelectric properties from pore design via adjustment and elimination of residual stresses for Yb0.2(CoSb2.875Te0.125)4
TL;DR: In this article, the Seebeck coefficient of the S4 sample with the micro-and nanopores is greatly enhanced due to the reduction of the carrier concentration induced by the energy filtering effect of the micro and nanopores.
Journal ArticleDOI
Enhanced Thermoelectric Performance of Yb-Filled Skutterudite with Bottom-Up Formed CoSi2 Nanoparticles.
Wenjing Shi,Qing Du,Changlei Niu,Dandan Qin,Yuxin Sun,Jianbo Zhu,Fushan Li,Liangjun Xie,Zi Qian Liu,Qian Zhang,Wei Cai,Feng Guo,Xin Li,Jiehe Sui +13 more
TL;DR: In this article , a new approach to obtain nanostructured materials by adding Si to Co-overstoichiometric Yb-filled skutterudite through high-energy ball milling, which embedded bottom-up formed CoSi2 nanoparticles into grain-refining Yb0.25Co4Sb12, synergistically resulting in the enhanced thermoelectric properties and room-temperature hardness.
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Enhancement of thermoelectric performance in TiNiSbxSn1-x half-Heusler alloys
TL;DR: In this paper , the antimony doping and the annealing process resulted in a significant improvement in the electrical properties of the TiNiSn-based materials, and allowed the samples to maintain relatively low lattice thermal conductivity.
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