Entropy engineering enabled atomically dispersed Cu doping leading to an exceptionally high thermoelectric figure of merit in n-type lead chalcogenides

Yuan, Ziling; Wu, Mengyue; Han, Shuai; Liu, Pengfei; Ge, Zhenhua; Ge, Bangzhi; Zhu, Menghua; Xu, Yadong; Jie, Wanqi; Zhao, Dongyao; Yang, Bingchao; Zhang, Yongsheng; Liu, Ming; Zhu, Min; Li, Chao; Yu, Yuan; Zhou, Chongjian

doi:10.1039/d4ee00691g

Energy Environ. Sci.

2024

DOI: 10.1039/d4ee00691g

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Entropy engineering enabled atomically dispersed Cu doping leading to an exceptionally high thermoelectric figure of merit in n-type lead chalcogenides

Ziling Yuan,

Mengyue Wu,

Shuai Han

et al.

Abstract: High-entropy lead chalcogenides usually exhibit high ZT values at a very narrow temperature window because the highly disordered lattice structure trades electrical conductivity for low lattice thermal conductivity (κlat). Here,...

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Cited by 7 publications

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Thermo‐Electro‐Magnetic Interactions and ≈1 nm Fe Interfacial Layer Realize High Average ZT in Fe/Mg₃(Sb,Bi)₂ Below 300 °C

Jin,

Nie,

Gao

et al. 2024

Adv Funct Materials

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Mg3(Sb,Bi)2 alloys offer exceptional near‐room temperature thermoelectric (TE) performance comparable to Bi2Te3. However, the low carrier mobility due to Mg vacancies and relatively high lattice thermal conductivity adversely affect overall TE performance. Herein, carrier mobility and thermal conductivity of Mg3(Sb,Bi)2 are decoupled by modulating both the phase interface and grain boundaries through incorporating different sizes of iron (Fe). Ferromagnetic micrometer‐sized Fe particles enhance the figure of merit (ZT) more than superparamagnetic nano‐sized counterparts. Magnetic moments of Fe induce the charge density overlap near phase boundaries and ≈1 nm Fe interfacial layer lowers grain‐boundary barriers, leading to sharply increased carrier mobility. Moreover, the additional magnon‐phonon scattering reduces lattice thermal conductivity by over 40%. Consequently, Fe/Mg3(Sb,Bi)2 composite achieves a high average ZT of 1.4 over room temperature to 573 K. The fabricated Mg3(Sb,Bi)2‐CdSb module demonstrates a high conversion efficiency of 8.4% under a 275 K temperature gradient, among the best for Mg3(Sb,Bi)2‐based modules. This work uncovers the role of thermo‐electro‐magnetic interactions in bolstering TE performance and inspires the development of low‐cost, high‐efficiency TE modules for low‐grade heat recovery.

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Thermo‐Electro‐Magnetic Interactions and ≈1 nm Fe Interfacial Layer Realize High Average ZT in Fe/Mg₃(Sb,Bi)₂ Below 300 °C

Jin,

Nie,

Gao

et al. 2024

Adv Funct Materials

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Spontaneous Orientation Polarization of Anisotropic Equivalent Dipoles Harnessed by Entropy Engineering for Ultra-Thin Electromagnetic Wave Absorber

Wang,

Xiao,

Zhai

et al. 2024

Nano-Micro Lett.

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The synthesis of carbon supporter/nanoscale high-entropy alloys (HEAs) electromagnetic response composites by carbothermal shock method has been identified as an advanced strategy for the collaborative competition engineering of conductive/dielectric genes. Electron migration modes within HEAs as manipulated by the electronegativity, valence electron configurations and molar proportions of constituent elements determine the steady state and efficiency of equivalent dipoles. Herein, enlightened by skin-like effect, a reformative carbothermal shock method using carbonized cellulose paper (CCP) as carbon supporter is used to preserve the oxygen-containing functional groups (O·) of carbonized cellulose fibers (CCF). Nucleation of HEAs and construction of emblematic shell-core CCF/HEAs heterointerfaces are inextricably linked to carbon metabolism induced by O·. Meanwhile, the electron migration mode of switchable electron-rich sites promotes the orientation polarization of anisotropic equivalent dipoles. By virtue of the reinforcement strategy, CCP/HEAs composite prepared by 35% molar ratio of Mn element (CCP/HEAs-Mn2.15) achieves efficient electromagnetic wave (EMW) absorption of − 51.35 dB at an ultra-thin thickness of 1.03 mm. The mechanisms of the resulting dielectric properties of HEAs-based EMW absorbing materials are elucidated by combining theoretical calculations with experimental characterizations, which provide theoretical bases and feasible strategies for the simulation and practical application of electromagnetic functional devices (e.g., ultra-wideband bandpass filter).

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Ultralow two-channel thermal conductivity in aikinite

Li,

Wei,

et al. 2024

Materials Today Physics

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Entropy engineering enabled atomically dispersed Cu doping leading to an exceptionally high thermoelectric figure of merit in n-type lead chalcogenides

Abstract: High-entropy lead chalcogenides usually exhibit high ZT values at a very narrow temperature window because the highly disordered lattice structure trades electrical conductivity for low lattice thermal conductivity (κlat). Here,...

Cited by 7 publications

References 68 publications

Thermo‐Electro‐Magnetic Interactions and ≈1 nm Fe Interfacial Layer Realize High Average ZT in Fe/Mg₃(Sb,Bi)₂ Below 300 °C

Thermo‐Electro‐Magnetic Interactions and ≈1 nm Fe Interfacial Layer Realize High Average ZT in Fe/Mg₃(Sb,Bi)₂ Below 300 °C

Spontaneous Orientation Polarization of Anisotropic Equivalent Dipoles Harnessed by Entropy Engineering for Ultra-Thin Electromagnetic Wave Absorber

Ultralow two-channel thermal conductivity in aikinite

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Entropy engineering enabled atomically dispersed Cu doping leading to an exceptionally high thermoelectric figure of merit in n-type lead chalcogenides

Abstract: High-entropy lead chalcogenides usually exhibit high ZT values at a very narrow temperature window because the highly disordered lattice structure trades electrical conductivity for low lattice thermal conductivity (κlat). Here,...

Cited by 7 publications

References 68 publications

Thermo‐Electro‐Magnetic Interactions and ≈1 nm Fe Interfacial Layer Realize High Average ZT in Fe/Mg3(Sb,Bi)2 Below 300 °C

Thermo‐Electro‐Magnetic Interactions and ≈1 nm Fe Interfacial Layer Realize High Average ZT in Fe/Mg3(Sb,Bi)2 Below 300 °C

Spontaneous Orientation Polarization of Anisotropic Equivalent Dipoles Harnessed by Entropy Engineering for Ultra-Thin Electromagnetic Wave Absorber

Ultralow two-channel thermal conductivity in aikinite

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Product

Resources

About

Thermo‐Electro‐Magnetic Interactions and ≈1 nm Fe Interfacial Layer Realize High Average ZT in Fe/Mg₃(Sb,Bi)₂ Below 300 °C

Thermo‐Electro‐Magnetic Interactions and ≈1 nm Fe Interfacial Layer Realize High Average ZT in Fe/Mg₃(Sb,Bi)₂ Below 300 °C