Fast, Simple, and Cost-Effective Fabrication of High-Performance Thermoelectric Ag2Se through Low-Temperature Hot-Pressing

IF 2.6 4区 材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY
ChemNanoMat Pub Date : 2024-07-12 DOI:10.1002/cnma.202400319
Jariya Lasiw, Teerasak Kamwanna, Supree Pinitsoontorn
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Abstract

Silver selenide (Ag2Se) is a promising thermoelectric material for near-room temperature applications. This study proposes a fast, simple, and cost-effective method for producing high thermoelectric performance bulk Ag2Se. Ag2Se powders were synthesized from Ag and Se powders via a one-hour wet ball milling process, followed by the fabrication of bulk pellets through low-temperature hot-pressing (130–250 °C) with a mere 0.5-hour holding time. Both Ag2Se powders and bulk pellets exhibited a single phase of Ag2Se with an orthorhombic structure. Moreover, uniform compositional distribution with the stoichiometric Ag : Se ratio was observed in all samples. Microstructural analysis revealed distinct grain boundaries in samples hot-pressed below 190 °C, transitioning to grain coalescence was at 190 °C and 250 °C. The thermoelectric and transport measurements demonstrated that the electrical conductivity decreased and the Seebeck coefficient increased with hot-pressing temperatures from 130 °C and 190 °C primarily due to reduced carrier concentrations. Thermal conductivity decreased with increasing hot-pressing temperatures up to 190 °C, attributed to the weak chemical bonding of Ag2Se and the presence of defects. This combination resulted in a peak zT over 1.0 at 300 K, with an average zT close to 1.0 from 300 to 380 K. In comparison to other reported synthesis methods, the present approach offers significantly reduced processing time, simplicity, and cost-effectiveness. Despite lower temperatures and shorter processing times, the method produces Ag2Se with zT values comparable to more intricate techniques. This fabrication route holds the potential for scalable mass production in the future.

Abstract Image

通过低温热压快速、简单、经济高效地制造出高性能热电Ag2Se
硒化银(Ag2Se)是一种很有前途的近室温应用热电材料。本研究提出了一种快速、简单、经济高效的方法来生产高热电性能的块状 Ag2Se。通过一个小时的湿球磨工艺,从Ag和Se粉末中合成出Ag2Se粉末,然后通过低温热压(130-250 °C)制造出块状颗粒,保温时间仅为0.5小时。Ag2Se 粉末和块状颗粒都呈现出单相正交β-Ag2Se 相,成分分布均匀。微观结构分析表明,在 190 ℃ 以下热压的样品中晶界明显,在 190 ℃ 和 250 ℃ 时过渡到晶粒凝聚。热电和传输测量表明,随着热压温度从 130 ℃ 升至 190 ℃,电导率降低,塞贝克系数升高,这主要是由于载流子浓度降低。热导率随着热压温度的升高而降低,直到 190 ℃,这归因于 Ag2Se 的弱化学键和缺陷的存在。尽管温度较低,加工时间较短,但该方法生产出的 Ag2Se 的 zT 值可与更复杂的技术相媲美。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
ChemNanoMat
ChemNanoMat Energy-Energy Engineering and Power Technology
CiteScore
6.10
自引率
2.60%
发文量
236
期刊介绍: ChemNanoMat is a new journal published in close cooperation with the teams of Angewandte Chemie and Advanced Materials, and is the new sister journal to Chemistry—An Asian Journal.
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