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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Grape juice: an effective liquid additive for significant enhancement of thermoelectric performance of Cu2Se
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Grape juice: an effective liquid additive for significant enhancement of thermoelectric performance of Cu2Se

机译：葡萄汁：一种有效的液体添加剂，用于显着提高CU2SE热电性能

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摘要

The reduction of thermal conductivity and enhancement of electrical properties is the ultimate goal for achieving high-performance thermoelectric materials. In this paper, a high thermoelectric performance is demonstrated when grape juice is used as an additive to Cu2Se. High temperature processing of the mixture pyrolyzes the sugars in the grape juice and provides a fine-scale and well-mixed dispersion of elemental carbon in the Cu2Se matrix. These materials show a significant enhancement of electrical conductivity due to a high hole concentration with little change of the Seebeck coefficient, leading to an ultra-high power factor of 1.3 mW m(-1)K(-2)at 984 K. Microstructural studies reveal that the carbon phase is embedded on the Cu2Se grain boundaries and that Cu2O nanoparticles are located at the interface between carbon and Cu2Se. This results in phonon scattering at the interface which leads to a reduction of thermal conductivity of up to similar to 38%. It is proposed that the formation of Cu2O also induces Cu deficiencies in Cu2Se resulting in greater enhancement of electrical conductivity. As a result, thezTis significantly enhanced up to similar to 2.5 at 984 K. This study opens up a new avenue for enhancing the properties of thermoelectric materials.
机译：导热率的降低和电气性能的增强是实现高性能热电材料的最终目标。在本文中，当葡萄汁用作Cu2Se添加剂时，对高温性能进行了说明。混合物的高温加工热解体葡萄汁中的糖，并在Cu2SE基质中提供了元素碳的微量和良好的分散体。由于高空穴浓度，这些材料显着提高了导电性，由于高孔浓度，塞贝克系数几乎没有变化，导致984K的超高功率因数为1.3mW mW（-1）k（-2）。微观结构研究揭示碳阶段嵌入Cu2Se晶界上，并且Cu2O纳米颗粒位于碳和Cu2se之间的界面处。这导致在界面处散射散射，这导致导热率降低至相似的导热率至38％。提出，Cu2O的形成也诱导Cu2Se中的Cu缺陷导致导电性的提高。结果，TheZTIS显着增强至984 K中的2.5。本研究开辟了一种新的途径，用于增强热电材料的性能。

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