Twin Engineering in Solution-Synthesized Nonstoichiometric Cu5FeS4 Icosahedral Nanoparticles for Enhanced Thermoelectric Performance
Twin Engineering in Solution-Synthesized Nonstoichiometric Cu5FeS4 Icosahedral Nanoparticles for Enhanced Thermoelectric Performance
复制标题
溶液合成非化学计量 Cu5FeS4 二十面体纳米颗粒的孪生工程可增强热电性能
DOI：
10.1002/adfm.201705117
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发表时间：
2018
影响因子：
19
通讯作者：
Wang GY
中科院分区：
文献类型：
--
作者：
Zhang Aijuan;Xie D;an;Ou Hongxia;Lu Xu;Zhou Xiaoyuan;Han Guang;Wang Guoyu;Zhang Bin;Han Xiaodong;Lu Wei;Dai Jiyan;Wang Guoyu;Zhou XY;Han G;Wang GY;Wang GY
发展了一种简便的胶体溶液法，用于快速、可规模化合成正交晶系@立方核-壳非化学计量比Cu 5 FeS 4二十面体纳米粒子。这种纳米颗粒含有五重孪晶形式的高密度孪晶边界。火花等离子烧结将纳米颗粒固结成纳米结构的颗粒，其保留高密度孪晶界和第二相缺铁立方Cu 5 FeS 4的调谐分数。因此，热和电输运性质协同优化，导致在710 K下的增强的zT = 0.62，比单相Cu 5 FeS 4高约51%。该研究为实现非化学计量比Cu 5 FeS 4纳米材料的高性能热电材料的孪生工程提供了一种节能方法。
A facile colloidal solution method has been developed for the fast, scalable synthesis of orthorhombic@cubic core–shell nonstoichiometric Cu5FeS4icosahedral nanoparticles. Such nanoparticles contain high‐density twin boundaries in the form of fivefold twins. Spark plasma sintering consolidates the nanoparticles into nanostructured pellets, which retain high‐density twin boundaries and a tuned fraction of the secondary phase Fe‐deficient cubic Cu5FeS4. As a result, the thermal and electrical transport properties are synergistically optimized, leading to an enhancedzTof ≈0.62 at 710 K, which is about 51% higher than that of single‐phase Cu5FeS4. This study provides an energy‐efficient approach to realize twin engineering in nonstoichiometric Cu5FeS4nanomaterials for high‐performance thermoelectrics.