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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Effect of Dislocation Arrays at Grain Boundaries on Electronic Transport Properties of Bismuth Antimony Telluride: Unified Strategy for High Thermoelectric Performance
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Thermoelectric properties of silicon and recycled silicon sawing waste
Ran He,Wieland Heyn,Wieland Heyn,Felix Thiel,Nicolás Pérez,Christine Damm,Darius Pohl,Darius Pohl,Bernd Rellinghaus,Bernd Rellinghaus,Christian Reimann,Maximilian Beier,Jochen Friedrich,Hangtian Zhu,Zhifeng Ren,Kornelius Nielsch,Kornelius Nielsch,Gabi Schierning +17 more
TL;DR: In this paper, the thermoelectric properties of various silicon-related materials with respect to their morphologies and microstructures were reviewed and the power factor of silicon sawing wastes recycled from silicon wafer manufacturing was obtained.
Journal ArticleDOI
Design of segmented high-performance thermoelectric generators with cost in consideration
Zhongliang Ouyang,Dawen Li +1 more
TL;DR: In this paper, state-of-the-art thermoelectric (TE) materials working between 300k and 1000k were cautiously selected, including materials in categories of Chalcogenides, SiGe alloy, Skutterudites and Half-Heuslers.
Journal ArticleDOI
Collective Effect of Fe and Se To Improve the Thermoelectric Performance of Unfilled p-Type CoSb3 Skutterudites
Ruchi Bhardwaj,Ruchi Bhardwaj,Bhasker Gahtori,Bhasker Gahtori,Kishor Kumar Johari,Kishor Kumar Johari,Sivaiah Bathula,Sivaiah Bathula,Nagendra S. Chauhan,Nagendra S. Chauhan,Avinash Vishwakarma,Avinash Vishwakarma,Sanjay R. Dhakate,Sanjay R. Dhakate,Sushil Auluck,Ajay Dhar +15 more
TL;DR: In this article, the authors reported a state-of-the-art thermoelectric figure of merit (ZT) in rare-earth-free p-type unfilled CoSb3 skutterudite co-doped with Fe and Se, synthesized using a facile process of arc melting and spark plasma sintering.
Journal ArticleDOI
High-Performance Solution-Processable Flexible SnSe Nanosheet Films for Lower Grade Waste Heat Recovery
Nicolas Augustus Rongione,Man Li,Huan Wu,Huu Duy Nguyen,Joon Sang Kang,Boya Ouyang,Hongyan Xia,Hongyan Xia,Yongjie Hu +8 more
TL;DR: In this paper, the authors focus on improving thermoelectric energy efficiency and identifying new records of thermodynamic properties of these materials, as defined through the concept of increased temperature.
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