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Realizing high thermoelectric performance in eco-friendly Bi2S3 with nanopores and Cl-doping through shape-controlled nano precursors
Nano Energy ( IF 17.6 ) Pub Date : 2022-06-09 , DOI: 10.1016/j.nanoen.2022.107478
Kangpeng Jin, Janak Tiwari, Tianli Feng, Yue Lou, Biao Xu

Porous materials have attracted extensive attention from research communities, showing great promise in energy-conversion applications. In this study, we prepared eco-friendly Bi2S3-based thermoelectric materials with porous structure using reticulated Bi2S3 nanonetwork synthesized by a solution-phase bottom-up strategy. Comprehensive structural characterizations through small-angle X-ray scattering (SAXS) and electron microscopy were performed to measure the pore structures in these materials. The distorted lattices, dense dislocations, and nanopores reduce the material’s lattice thermal conductivity to as low as 0.36 Wm-1K-1 at 823 K, which is 22% lower than that of the less porous counterpart. Simultaneously, Cl was doped into the lattice, which greatly improved the electrical conductivity and mitigated the deterioration of the electrical performance by the pore structure. The maximum power factor reaches 0.47 mWm-1K-2. The synergistic effect of nanopores and Cl doping greatly improves the thermoelectric properties of the Bi2S3 system, and the highest ZT value reaches 0.81 at 823 K, which is nearly 60% higher than that of the control sample with fewer pores. This work develops a new strategy for the preparation of high-performance and light-weight thermoelectric materials.



中文翻译:

通过形状控制的纳米前驱体在具有纳米孔和 Cl 掺杂的环保 Bi2S3 中实现高热电性能

多孔材料已引起研究界的广泛关注,在能量转换应用中显示出巨大的前景。在这项研究中,我们使用通过溶液相自下而上策略合成的网状Bi 2 S 3纳米网络制备了具有多孔结构的环保Bi 2 S 3基热电材料。通过小角 X 射线散射 (SAXS) 和电子显微镜进行全面的结构表征,以测量这些材料中的孔结构。扭曲的晶格、致密的位错和纳米孔将材料的晶格热导率降低到低至 0.36 Wm -1 K -1在 823 K 时,比多孔较少的对应物低 22%。同时,将Cl掺杂到晶格中,极大地提高了电导率,减轻了孔结构对电性能的劣化。最大功率因数达到0.47 mWm -1 K -2。纳米孔和Cl掺杂的协同作用大大提高了Bi 2 S 3体系的热电性能,最高ZT值在823 K时达到0.81,比孔较少的对照样品提高了近60%。这项工作为制备高性能和轻质热电材料开发了一种新策略。

更新日期:2022-06-14
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