通过引入 ZnS 纳米结构增强 Cu1.8S 的热电特性†。

IF 5 3区 材料科学 Q2 CHEMISTRY, PHYSICAL
Gouri Sankar, Madhuvathani Saminathan, Suresh Perumal, R. Tamilarasi and Geetha Arunachalam
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引用次数: 0

摘要

硫化铜(Cu1.8S)因其优越的导电性、热稳定性和低成本的原材料,在过去几年中得到了广泛的认可。在这项工作中,我们研究了纳米结构 ZnS 对 Cu1.8S 热电性能的影响。Cu1.8S + x wt% ZnS(x = 0、5、10 和 20)的纳米复合材料经过水热处理,并采用冷压技术烧结。XRD 图谱验证了材料结构、相的纯度和 ZnS 相的存在,而带有 EDX 元素图谱的背散射电子显微镜图显示了 Cu1.8S 基体上的二次 CuS 相沉淀,为 SEM 图谱提供了佐证。最终,由于 ZnS 的加入驱动了低能量载流子滤波,塞贝克系数在 573 K 时大幅提高到 63.44 μV K-1,从而使 Cu1.8S + 5 wt% ZnS 样品在 573 K 时的功率因数达到 525.12 μW mK-2。来自 CuS 中尺度结构、孔隙和点缺陷的散射共同抑制了晶格热导率,从而使 Cu1.8S + 5 wt% ZnS 样品在 323 K 时的总热导率降至 2.64 W mK-1,在 573 K 时的 zT 显著增至 0.08。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Enhanced thermoelectric properties of Cu1.8S via the introduction of ZnS nanostructures†

Enhanced thermoelectric properties of Cu1.8S via the introduction of ZnS nanostructures†

Copper sulfide (Cu1.8S) has attained widespread recognition over the past few years because of its superior electrical conductivity, thermal stability and low-cost raw materials. In this work, we studied the influence of nanostructured ZnS on the thermoelectric properties of Cu1.8S. The nanocomposites of Cu1.8S + x wt% ZnS (x = 0, 5, 10 and 20) were treated hydrothermally and sintered using cold pressing technique. XRD patterns validated the material structure, purity of the phase and the presence of the ZnS phase, whereas backscattered electron micrographs with EDX elemental mapping displayed secondary CuS phase precipitation on the Cu1.8S matrix, supporting SEM patterns. Eventually, a considerable improvement in the Seebeck coefficient to 63.44 μV K−1 at 573 K was achieved as a result of ZnS incorporation-driven low energy carrier filtering, thereby leading to a power factor of 525.12 μW mK−2 at 573 K for the Cu1.8S + 5 wt% ZnS sample. Scattering from CuS mesoscale structures, pores and point defects collectively suppressed lattice thermal conductivity and thereby reduced the total thermal conductivity to 2.64 W mK−1 at 323 K for Cu1.8S + 5 wt% ZnS by significantly enhancing the zT to 0.08 at 573 K.

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来源期刊
Sustainable Energy & Fuels
Sustainable Energy & Fuels Energy-Energy Engineering and Power Technology
CiteScore
10.00
自引率
3.60%
发文量
394
期刊介绍: Sustainable Energy & Fuels will publish research that contributes to the development of sustainable energy technologies with a particular emphasis on new and next-generation technologies.
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