Han Yue, Li Xiaohan, Jin Yifang, Wang Xiaolin, Sun Xingnan, An Cheng Jin
Department of Chemistry, National Demonstration Centre for Experimental Chemistry Education, Yanbian University, Yanji, Jilin, 133002, China.
Small. 2024 Jul;20(29):e2309863. doi: 10.1002/smll.202309863. Epub 2024 Feb 17.
Research on flexible thermoelectric (TE) materials has typically focused on conducting polymers and conducting polymer-based composites. However, achieving TE properties comparable in magnitude to those exhibited by their inorganic counterparts remains a formidable challenge. This study focuses on the synthesis of silver selenide (AgSe) nanomaterials using solvothermal methods and demonstrates a significant enhancement in their TE properties through the synergistic dual doping of sulfur and copper. Flexible TE thin films demonstrating excellent flexibility are successfully fabricated using vacuum filtration and hot-pressing techniques. The resulting thin films also exhibited outstanding TE performance, with a high Seebeck coefficient (S = -138.5 µV K) and electrical conductivity (σ = 1.19 × 10 S m). The record power factor of 2296.8 µW m K at room temperature is primarily attributed to enhanced carrier transport and interfacial energy filtration effects in the composite material. Capitalizing on these excellent TE properties, the maximum power output of flexible TE devices reached 1.13 µW with a temperature difference of 28.6 K. This study demonstrates the potential of AgSe-based TE materials for flexible and efficient energy-harvesting applications.
对柔性热电（TE）材料的研究通常集中在导电聚合物和基于导电聚合物的复合材料上。然而，要实现与无机对应物相当的热电性能，仍然是一项艰巨的挑战。本研究聚焦于采用溶剂热法合成硒化银（AgSe）纳米材料，并通过硫和铜的协同双掺杂证明其热电性能有显著增强。利用真空过滤和热压技术成功制备出具有优异柔韧性的柔性TE薄膜。所得薄膜还展现出出色的热电性能，具有高塞贝克系数（S = -138.5 μV K）和电导率（σ = 1.19×10 S m）。室温下2296.8 μW m K的创纪录功率因数主要归因于复合材料中载流子传输的增强和界面能量过滤效应。利用这些优异的热电性能，柔性TE器件在28.6 K的温差下最大输出功率达到1.13 μW。本研究证明了基于AgSe的TE材料在柔性高效能量收集应用中的潜力。
