Bi_(2)Te_(3)/KOH/PEDOT:PSS和SiO_(2)气凝胶增强钢丝绒热电性能研究  

Study on the thermoelectric properties of steel woolenhanced by Bi_(2)Te_(3)/KOH/PEDOT:PSS and SiO_(2)aerogel

作　　者：彭小敏 雷洪[1] 陈伽俊 PENG Xiaomin;LEI Hong;CHEN Jiajun(College of Materials and Chemistry,Southwest University of Science and Technology,Mianyang 621000,China)

机构地区：[1]西南科技大学材料与化学学院,四川绵阳621000

出　　处：《功能材料》2024年第6期6101-6107,6117,共8页Journal of Functional Materials

基　　金：西南科技大学龙山学术人才研究支撑项目(17LZX601,18LZX547)。

摘　　要：在热电材料研究领域,一般认为金属的Seebeck系数较低,因此有关金属的热电性能的研究并不多见。但研究发现金属的物理形态对其热电性能具有影响。考察了金属纤维钢丝绒(SW)的热电性能。发现SW(主要成分为Fe)的Seebeck系数是块体铁的2倍。在此基础上,将SW与有机和无机热电材料进行复合,并在其空隙中填充SiO_(2)气凝胶,最终制备出了Bi_(2)Te_(3)/KOH/PEDOT:PSS@SW-SiO_(2)气凝胶复合材料,使其热电性能得到了进一步提升。结果表明,气凝胶的加入可使SW的导热系数降低34%。电导率(σ)、热导率(κ)和Seebeck系数(S)得到解耦。Bi_(2)Te_(3)/KOH/PEDOT:PSS@SW-SiO_(2)气凝胶的Seebeck系数、热电优值(ZT)和功率因子(PF)分别是纯SW的1.2、3.4、2.4倍。通过改变材料物理形态和添加气凝胶来提高材料热电性能的方式有望为其他热电材料的研究提供新的思路和有益参考。It is generally believed that the Seebeck coefficient of metals is low in the research field of thermoelectric materials.Therefore,few studies have been reported on the thermoelectric properties of metals.However,this study found that the physical form of metals may have effect on their thermoelectric properties.In this study,the thermoelectric properties of steel wool(SW)were investigated.It was found that the Seebeck coefficient of SW,whose main component was Fe,was twice that of bulk iron.On this basis,steel wool was compounded with organic and inorganic thermoelectric materials and its voids were filled with SiO_(2)aerogel.Finally,a composite of Bi_(2)Te_(3)/KOH/PEDOT:PSS@SW-SiO_(2)was prepared.A significant improvement in thermoelectric properties was observed compared to bare SW.The results show that the addition of aerogel can reduce the thermal conductivity of SW by 34%.The electrical conductivity(σ),thermal conductivity(κ)and Seebeck coefficient(S)have been decoupled.The Seebeck coefficient,thermoelectric merit value(ZT)and power factor(PF)of Bi_(2)Te_(3)/KOH/PEDOT:PSS@SW-SiO_(2)are 1.2,3.4 and 2.4 times as large as that of bare SW,respectively.The way to improve the thermoelectric properties of the material by changing the physical morphology of the material and decouplingσ,κand S is expected to provide new ideas for the research of other thermoelectric materials.

关 键 词：钢丝绒 热电材料 热电性能 金属纤维复合物 SiO_(2)气凝胶 

分 类 号：O614.81[理学—无机化学] O622.7[理学—化学]