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
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Journal ArticleDOI
Unusual Thermoelectric Properties Mediated by Solute Segregation in Tellurium Alloyed CoSbS
Weihong Guo,Zi Qian Liu,Jiehe Sui,Yuxi Yang,M.C. Deng,Xiang Wei,Yixuan Li,Yu-dong Fu,Bin Sun +8 more
TL;DR: In this paper , the carrier concentration and lattice thermal conductivity in thermoelectric materials were investigated and the authors found an unusual phenomenon, where Co0.94Ni0.06SbS1-xTex was found to have anomalous properties.
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Achievements and Prospects of Thermoelectric and Hybrid Energy Harvesters for Wearable Electronic Applications
Mengying Xie,Christopher R. Bowen,Tom Pickford,Chaoying Wan,Mingzhu Zhu,Mingzhu Zhu,Shima Okada,Shima Okada,Sadao Kawamura,Sadao Kawamura +9 more
TL;DR: In this paper, the development of organic and nanocomposite thermoelectric (TE) materials, inorganic TE materials with flexible supporting substrate, and self-supporting flexible inorganic TEGs without substrates is reviewed.
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Electronic Orbital Alignment and Hierarchical Phonon Scattering Enabling High Thermoelectric Performance p-Type Mg3Sb2 Zintl Compounds
TL;DR: In this article , the electrical properties of p-type Mg3Sb2 are dramatically optimized by the regulation of Mg deficiency, and the alignment of px,y and pz orbital, resulting in a high band degeneracy and the dramatically enhanced Seebeck coefficient, demonstrated by the DFT calculations and electronic properties measurement.
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Robust combined modeling of crystalline and amorphous silicon grain boundary conductance by machine learning
TL;DR: In this article , the relationship between grain boundary (GB) structure and its thermal and electric boundary conductance (TBC and EBC) calculated by Green's function methods is investigated.
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Annealing engineering induced high thermoelectric performance in Yb-filled CoSb3 skutterudites
TL;DR: In this article , the influence of annealing temperature on the microstructure and thermoelectric properties of Yb-filled CoSb3-based skutterudites was investigated.
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High-Thermoelectric Performance of Nanostructured Bismuth Antimony Telluride Bulk Alloys
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