柔性热电(TE)发电机最近吸引了越来越多的关注,因为它们具有使用人体和环境之间的温差为可穿戴设备供电的潜力。据报道,Ag2S在室温附近具有可塑性;然而,它的电导率非常低,导致其不良的TE财产。这里,为了改善TE属性,通过结合湿化学合成,在尼龙膜上制备了不同量的Se(Se/Ag2S摩尔比为0.4、0.5和0.6)固溶体取代的Ag2S膜,真空过滤,和热压。薄膜(Se/Ag2S摩尔比=0.6)在室温下表现出更好的TE性能,功率因数为477.4±15.20μWm-1K-2,与散装Ag2S1-xSex相当。此外,该薄膜具有优异的柔韧性(沿半径为4毫米的棒弯曲2000次后,电导率仅降低5.4%)。在28.8K的温差下,与薄膜组装的6腿TE发电机的功率密度为6.6W/m2。这项工作为低成本的基于Ag2S的TE薄膜提供了一条简便的新途径,高TE性能,和超高的灵活性。
Flexible thermoelectric (TE) generators have recently attracted increasing attention as they have the potential to power wearable devices using the temperature difference between the human body and the environment. Ag2S is recently reported to have plasticity near room temperature; however, it has very low electrical conductivity, leading to its poor TE property. Here, to improve the TE property, different amounts of Se (Se/Ag2S molar ratios being 0.4, 0.5, and 0.6) solid solution-substituted Ag2S films on a nylon membrane are prepared by combing wet-chemical synthesis, vacuum filtration, and hot-pressing. The film (Se/Ag2S molar ratio = 0.6) exhibits a better TE performance with a power factor of 477.4 ± 15.20 μW m-1 K-2 at room temperature, which is comparable to that of bulk Ag2S1-xSex. In addition, the film possesses excellent flexibility (only ∼5.4% decrease in electrical conductivity after 2000 times bending along a rod with a radius of 4 mm). The power density of a 6-leg TE generator assembled with the film is 6.6 W/m2 under a temperature difference of 28.8 K. This work provides a facile new route to Ag2S-based TE films with low cost, high TE performance, and ultrahigh flexibility.