Bi_2Te_3/炭黑复合材料的制备及热电性能  

Preparation and thermoelectric properties of Bi_2Te_3/carbon black composites

作　　者：孙希静[1] 赵敬红[1] 刘艳玲[1] 李娟娟[1] 赵丽娟[1] 李权[1] 

机构地区：[1]四川师范大学化学与材料科学学院,成都610066

出　　处：《复合材料学报》2017年第5期1075-1081,共7页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(51303116)

摘　　要：采用水热法合成Bi_2Te_3粉体,将炭黑(CB)与其掺杂制备不同比例的碲化铋/炭黑(Bi_2Te_3/CB)复合材料,研究复合材料的热电性能。同时采用TGA、SEM、XRD等分析方法表征Bi_2Te_3/CB复合材料的结构,探究微观结构与热电性能的关系。研究发现:室温下,CB的引入使Bi_2Te_3/CB复合材料的热导率大大降低(0.5957 W/(m·K)降到0.0888 W/(m·K));随着Bi_2Te_3含量的增加,复合材料的电导率、热导率均增大,Seebeck系数先增加后降低;当Bi_2Te_3含量为88.9%时,在558℃烧结10min所得的Bi_2Te_3/CB复合材料室温下热电优值ZT最大(ZT=0.21)。虽然ZT值未能达到应用价值,但是CB的添加为改善Bi_2Te_3材料的热电性能,尤其在降低材料的热导率方面,提供了新方法和新思路。Bi2Te3 powders were successfully synthesized by hydrothermal reaction, which were composited with carbon black （CB）, and then the thermoelectric （TE） performance of Bi2Te3/CB composites was investigated. At the same time, TGA, SEM and XRD analysis methods were used to characterize the structure of Bi2Te3/CB composites and the relationship between microscopic structures and TE properties was researched intensively. It shows that the thermal conductivities of Bi2 Tea/CB composites reduce sharply. （from 0.5957 W/（m·K） to 0. 0888 W/（m· K） at room temperature） because of doped with CB under the special structure design. However, the values of electrical and thermal conductivities of Bi2Te3/CB composites improve with the increase of Bi2Te3 weight fraction, and Seebeck coefficients increase first and then decrease. After sintering under 558; for 10 min, the figure of merit （ZT） of Bi2Te3/CB composites with 88.9% Bi2Te3 is the best （ZT =0. 21） at room temperature. Although the ZT value is much lower than the stand of TE material application, this topic investigation may provide new insights and optimization approach into the design and development of Bi2Te3 TE material for application, especially in terms of lower thermal conductivity of materials.

关 键 词：碲化铋 热电材料 炭黑 热电性能 复合材料 

分 类 号：TB34[一般工业技术—材料科学与工程]