放电等离子烧结
石墨烯
材料科学
电子迁移率
复合材料
热电效应
兴奋剂
电阻率和电导率
热电材料
烧结
光电子学
纳米技术
热导率
电气工程
物理
工程类
热力学
作者
Zhifang Zhou,Jinming Guo,Yunpeng Zheng,Yueyang Yang,Bin Yang,Dengfeng Li,Wenyu Zhang,Bin Wei,Chang Liu,Jinle Lan,Ce‐Wen Nan,Yuanhua Lin
标识
DOI:10.1002/smtd.202301619
摘要
BiCuSeO is a promising oxygen-containing thermoelectric material due to its intrinsically low lattice thermal conductivity and excellent service stability. However, the low electrical conductivity limits its thermoelectric performance. Aliovalent element doping can significantly improve their carrier concentration, but it may also impact carrier mobility and thermal transport properties. Considering the influence of graphene on carrier-phonon decoupling, Bi0.88 Pb0.06 Ca0.06 CuSeO (BPCCSO)-graphene composites are designed. For further practical application, a rapid preparation method is employed, taking less than 1 h, which combines self-propagating high-temperature synthesis with spark plasma sintering. The incorporation of graphene simultaneously optimizes the electrical properties and thermal conductivity, yielding a high ratio of weighted mobility to lattice thermal conductivity (144 at 300 K and 95 at 923 K). Ultimately, BPCCSO-graphene composites achieve exceptional thermoelectric performance with a ZT value of 1.6 at 923 K, bringing a ≈40% improvement over BPCCSO without graphene. This work further promotes the practical application of BiCuSeO-based materials and this facile and effective strategy can also be extended to other thermoelectric systems.
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