Preparation of Highly Stable Black Phosphorus by Gold Decoration for High‐Performance Thermoelectric Generators,Advanced Functional Materials

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Preparation of Highly Stable Black Phosphorus by Gold Decoration for High‐Performance Thermoelectric Generators
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-05-22 , DOI: 10.1002/adfm.201800532
Cheng Jin An ₁ , Young Hun Kang ₁ , Changjin Lee ₁ , Song Yun Cho ₁

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For thermoelectric (TE) applications, the surface of exfoliated black phosphorus (BP) can be successfully functionalized with Au nanoparticles (NPs), leading to significantly enhanced TE performance for a controlled Au NP content. A facile and selective decoration of metal species on the defect sites of BP is achieved by the spontaneous formation of Au NPs on the surface of BP through a redox reaction of Au precursors. Such a heterostructure provided by the Au decoration of BP enhances electrical conductivity (from 0.001 to 63.3 S cm⁻¹) through tuning of the charge carrier concentration and retains the initial Seebeck coefficient of BP. Consequently, the TE power factor of the Au‐decorated BP increases significantly to 68.5 µV m⁻¹ K⁻², which is 2740 times that of the pristine BP. More significantly, in contrast to the severe degradation of the pristine BP in the air, surface‐functionalized BP exhibits excellent stability upon exposure to air for a long period, which is beneficial for practical TE applications. Given these interesting and unique properties of Au‐decorated BP, a vertical TE generator with a high power output of 79.3 nW (ΔT = 2 °C) is prepared by using the Au‐decorated BP as a p‐type TE material.

中文翻译：

高性能热电发电机金饰法制备高稳定性黑磷

对于热电（TE）应用，可以用Au纳米颗粒（NPs）成功地对剥落的黑磷（BP）表面进行功能化，从而在受控的Au NP含量方面显着增强了TE性能。通过Au前体的氧化还原反应在BP表面上自发形成Au NPs，可以在BP缺陷位点上轻松，选择性地装饰金属种类。由BP的Au修饰提供的这种异质结构通过调整电荷载流子浓度来增强电导率（从0.001至63.3S cm ^-1）并保留BP的初始塞贝克系数。因此，Au装饰的BP的TE功率因数显着增加至68.5 µV m ^-1 K ^-2是原始BP的2740倍。更重要的是，与空气中原始BP的严重降解相反，经表面官能化的BP在长时间暴露于空气中时表现出出色的稳定性，这对实际的TE应用很有帮助。考虑到Au装饰BP的这些有趣且独特的特性，通过使用Au装饰BP作为ap型TE材料，可以制备出具有79.3 nW（ΔT = 2°C）高功率输出的立式TE发生器。

更新日期：2018-05-22

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