High thermoelectric properties with low thermal conductivity due to the porous structure induced by the dendritic branching in n-type PbS
High thermoelectric properties with low thermal conductivity due to the porous structure induced by the dendritic branching in n-type PbS
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由于 n 型 PbS 中的枝晶分支引起的多孔结构，具有高热电性能和低导热率
DOI：
10.1007/s12274-022-4117-9
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发表时间：
2022-02
期刊：
影响因子：
9.9
通讯作者：
Biao Xu
中科院分区：
文献类型：
--
作者：
Zhenyu Zhu;Janak Tiwari;Tianli Feng;Zhan Shi;Yue Lou;Biao Xu
PbS基热电材料因其地球资源丰富、成本低等优点，近年来受到广泛关注，被认为是传统PbTe材料的替代品。然而，其较高的导热系数限制了其发展。因此，为了通过降低导热系数来改善其热电性能，采用溶液合成法合成了一种晶粒度和形貌可控的树枝状PbS。通过调整表面活性剂(CTAB)的用量，调节枝晶的具体形成过程。树枝状PbS纳米粒子在烧结后，由于树枝的重叠和交错排列，容易形成多孔结构。作为对比，我们还制备了一种规则的八面体PBS，由于八面体结构的完整性，形成了致密的堆积排列。用基于密度泛函理论的玻尔兹曼输运方程证明了孔道结构在声子散射中的重要作用。在773K时，n型PbS晶体仍保持高速生长，并有望在较高的温度范围内获得较高的ZT值，从而获得最大的ZT=1.0。我们的工作可能会对其他热电材料从形成多孔结构来降低导热系数方面有所启示。
PbS-based thermoelectric materials have attracted extensive attention in recent years for the advantages of earth abundancy and low cost, which is considered to be a substitute for traditional PbTe material. However, their high thermal conductivity restricts its development. Hence, in order to improve their thermoelectric performance from reducing the thermal conductivity, a kind of dendritic PbS with controlled crystal grain and morphology are obtained by solution synthesis. By adjusting the amount of surfactant (CTAB), the specific formation process of dendrites is regulated. After sintering, the dendritic PbS nanoparticles are easy to form porous structure due to the overlapping and staggered arrangement of dendritic branches. For comparison, we also prepare a kind of regular octahedral PbS and a dense packing arrangement is formed because of the integrity of the octahedral structure. DFT-based Boltzmann transport equation is used to prove the crucial role of porous structure in scattering phonon. Finally, a maximum zT = 1.0 at 773 K in n-type PbS is obtained, which still keep a high-speed growth and is expected to get higher zT value in a higher temperature region. Our work may shed light to other thermoelectric materials from the formation of porous structure to reduce the thermal conductivity.
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DOI：
10.1088/0022-3727/46/40/405301
发表时间：
2013-10
期刊：
Journal of Physics D: Applied Physics
影响因子：
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发表时间：
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期刊：
ChemInform
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作者：
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影响因子：
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作者：
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影响因子：
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