Solid‐State Explosive Reaction for Nanoporous Bulk Thermoelectric Materials |
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Authors: | Kunpeng Zhao Haozhi Duan Nunna Raghavendra Pengfei Qiu Yi Zeng Jihui Yang Xun Shi Lidong Chen |
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Affiliation: | 1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, China;2. Shanghai Institute of Ceramics, University of Chinese Academy of Sciences, Beijing, China;3. Materials Science and Engineering Department, University of Washington, Seattle, WA, USA;4. Shanghai Institute of Materials Genome, Shanghai, China |
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Abstract: | High‐performance thermoelectric materials require ultralow lattice thermal conductivity typically through either shortening the phonon mean free path or reducing the specific heat. Beyond these two approaches, a new unique, simple, yet ultrafast solid‐state explosive reaction is proposed to fabricate nanoporous bulk thermoelectric materials with well‐controlled pore sizes and distributions to suppress thermal conductivity. By investigating a wide variety of functional materials, general criteria for solid‐state explosive reactions are built upon both thermodynamics and kinetics, and then successfully used to tailor material's microstructures and porosity. A drastic decrease in lattice thermal conductivity down below the minimum value of the fully densified materials and enhancement in thermoelectric figure of merit are achieved in porous bulk materials. This work demonstrates that controlling materials' porosity is a very effective strategy and is easy to be combined with other approaches for optimizing thermoelectric performance. |
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Keywords: | electrical conductivity nanoporous solid‐state explosive reaction thermal conductivity thermoelectric materials |
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