High-entropy-stabilized chalcogenides with high thermoelectric performance

doi:10.1126/science.abe1292

GSTDTAP > 气候变化

DOI	10.1126/science.abe1292
	High-entropy-stabilized chalcogenides with high thermoelectric performance
	Binbin Jiang; Yong Yu; Juan Cui; Xixi Liu; Lin Xie; Jincheng Liao; Qihao Zhang; Yi Huang; Shoucong Ning; Baohai Jia; Bin Zhu; Shengqiang Bai; Lidong Chen; Stephen J. Pennycook; Jiaqing He
	2021-02-19
发表期刊	Science
出版年	2021
英文摘要	Thermoelectric devices can convert waste heat into electricity, providing one path for improving energy efficiency. Jiang et al. leveraged entropy engineering to synthesize a single-phase high-entropy alloy with attractive thermoelectric properties. By increasing the number of elements in the alloy, the resulting disorder helps to stabilize against breakdown into multiple phases. The disordered and distorted crystal lattice suppresses thermal transport while maintaining the electrical properties, which boosts the heat-conversion efficiency of the material. Science , this issue p. [830][1] Thermoelectric technology generates electricity from waste heat, but one bottleneck for wider use is the performance of thermoelectric materials. Manipulating the configurational entropy of a material by introducing different atomic species can tune phase composition and extend the performance optimization space. We enhanced the figure of merit ( zT ) value to 1.8 at 900 kelvin in an n-type PbSe-based high-entropy material formed by entropy-driven structural stabilization. The largely distorted lattices in this high-entropy system caused unusual shear strains, which provided strong phonon scattering to largely lower lattice thermal conductivity. The thermoelectric conversion efficiency was 12.3% at temperature difference Δ T = 507 kelvin, for the fabricated segmented module based on this n-type high-entropy material. Our demonstration provides a paradigm to improve thermoelectric performance for high-entropy thermoelectric materials through entropy engineering. [1]: /lookup/doi/10.1126/science.abe1292
领域	气候变化 ; 资源环境
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文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/315729
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Binbin Jiang,Yong Yu,Juan Cui,et al. High-entropy-stabilized chalcogenides with high thermoelectric performance[J]. Science,2021.
APA	Binbin Jiang.,Yong Yu.,Juan Cui.,Xixi Liu.,Lin Xie.,...&Jiaqing He.(2021).High-entropy-stabilized chalcogenides with high thermoelectric performance.Science.
MLA	Binbin Jiang,et al."High-entropy-stabilized chalcogenides with high thermoelectric performance".Science (2021).