摘要
践行绿色发展,提高能源利用效率,热电材料基于本征的电子与声子相互作用,提供了一种高效能源转换媒介,为低品质废热发电和热电制冷开创了一种新策略。本实验采用机械合金化(MA)结合放电等离子体烧结(SPS)技术,高质量制备黝铜矿基热电复合材料,异于传统的固相法,具有节能省时、材料性能稳定等特点。将制备的热电块体样品采用金刚石线切割进行精密切割,使用ZEM-3、XRD分别测试电学性能和物相结构。实验结果表明,采用Ag2S第二相复合后,样品维持高泽贝克系数的同时,电导率进一步提升,在高温时获得高功率因子12.8μW·cm^(-1)·K^(-2)。同时,复合后样品的κ值基本小于1.0 W·m^(-1)·K^(-1)。最终,样品获得较高ZT值,当复合量为1.0vol%时,取得最高值0.95@723 K,接近商业化应用的要求。
Based on proposing green development and improving energy efficiency,thermoelectric materials provide an efficient energy conversion medium based on intrinsic electron-phonon interactions,creating a new strategy for low-quality waste heat generation and thermoelectric refrigeration.Using mechanical alloying(MA)combined with spark plasma sintering(SPS)technology,high-quality tetrahedrite-based thermoelectric composites are prepared,which is different from the traditional solid-state method and plays great merits of energy saving,time saving,and property stability.The prepared thermoelectric bulks are precisely cut using diamond wire cutting,and the electrical properties and phase structure are tested using ZEM-3 and XRD,respectively.The experimental results show that the sample maintains a high Seebeck coefficient while further improving its conductivity using Ag 2S as the second phase composite.Finally,a high power factor of 12.8μW·cm^(-1)·K^(-2) is achieved at high temperature.Furthermore,κvalues of the samples are basically less than 1.0 W·m^(-1)·K^(-1),which lead to a higher ZT value.The highest ZT value,0.95@723 K,was achieved when the composite amount was 1.0vol%.It is necessary for commercial applications.
作者
郑子豪
孙富华
谭军
王心宇
张晓兴
田冬霞
ZHENG Zihao;SUN Fuhua;TAN Jun;WANG Xinyu;ZHANG Xiaoxing;TIAN Dongxia(Hubei Key Laboratory of Photoelectric Materials and Devices,School of Materials Science and Engineering,Hubei Normal University,Huangshi 435002,Hubei,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2024年第S01期439-442,共4页
Materials Reports
基金
国家自然科学基金(52202232,12304041)
湖北省自然科学基金(2022CFB937)
研究生教育教学改革研究项目(2023JY17)。
关键词
黝铜矿
热电材料
电学性能
硫化银
tetrahedrite
thermoelectric materials
electrical performance
silver sulfide
