High thermoelectric and mechanical performance in the n-type polycrystalline SnSe incorporated with multi-walled carbon nanotubes

材料科学 热电效应 碳纳米管 声子散射 热电材料 微晶 热导率 复合材料 纳米技术 冶金 热力学 物理
作者
Xinyu Mao,Xiao‐Lei Shi,Liang-Chuang Zhai,Wei‐Di Liu,Guangming Chen,Han Gao,Meng Li,De‐Zhuang Wang,Hao Wu,Zhuanghao Zheng,Yifeng Wang,Qingfeng Liu,Zhi‐Gang Chen
出处
期刊:Journal of Materials Science & Technology [Elsevier BV]
卷期号:114: 55-61 被引量:32
标识
DOI:10.1016/j.jmst.2021.12.002
摘要

In this study, we introduce multi-walled carbon nanotubes (MWCNTs) in Pb/I co-doped n-type polycrystal SnSe to simultaneously improve its thermoelectric and mechanical properties for the first time. The introduced MWCNTs act as the “bridges” to accelerate the electron carrier transport between SnSe grains, leading to significantly increased electrical conductivity from 32.6 to 45.7 S cm−1 at 773 K, which contributes to an enhanced power factor of ∼5.0 μW cm−1 K − 2 at this temperature. Although MWCNTs possess high intrinsic thermal conductivities, these MWCNTs, acting as nanoinclusions in the SnSe matrix to form the dense interfaces between SnSe and MWCNTs, provide extra heat-carrying phonon scattering centers, leading to a slightly reduced lattice thermal conductivity of only 0.34 W m − 1 K − 2 at 773 K and in turn, a high ZT of ∼1.0 at this temperature. Furthermore, the introduced MWCNTs can simultaneously act as the “binders” to bond adjacent grains, significantly improving the mechanical properties of SnSe by boosting its Vickers hardness from 39.5 to 50.5. This work indicates that our facile approach can achieve high thermoelectric and mechanical properties in n-type SnSe polycrystals with a considerable potential for applying to thermoelectric devices as n-type elements.
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