间隔织物基光热-热电复合材料的制备及其性能

为提高柔性可穿戴供能设备的热电性能,首先利用NaOH和二甲亚砜(DMSO)共同掺杂聚(3,4-乙烯二氧噻吩)-聚苯乙烯磺酸(PEDOT:PSS)制备NaOH/DMSO/PEDOT:PSS热电膜,研究了NaOH及DMSO质量分数对PEDOT:PSS电导率、塞贝克系数以及功率因数的影响;然后以棉/涤纶间隔织物为基材,通过复合NaOH/DMSO/PEDOT:PSS并涂覆ZrC/聚氨酯(PU)光热层制备光热-热电复合材料,并对复合材料的形貌结构和热电性能等进行表征。结果表明:当添加质量分数为0.5%的NaOH及3.5%的DMSO时,NaOH/DMSO/PEDOT:PSS热电膜的功率因数达到最高,为25.6 μW/(m·K²),是纯PEDOT:PSS膜的2 327倍;光热-热电复合材料的塞贝克系数为35.5 μV/K,添加ZrC/PU光热层后复合材料在光照下产生的电压为无光热层复合材料的6.3倍。

Preparation and performance of spacer fabric-based photothermal-thermoelectric composites

In order to improve the thermoelectric performance of flexible wearable energy supply equipment, NaOH and dimethylsulfoxide (DMSO) are used together to dope poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate)(PEDOT:PSS)to prepare NaOH/DMSO/PEDOT:PSS thermoelectric film, and the influence of NaOH and DMSO concentration on the conductivity, Seebeck coefficient and power factor of PEDOT:PSS were studied. Cotton/polyester spacer fabric was used as the substrate, and the photothermal-thermoelectric composite thermoelectric material was prepared by compounding NaOH/DMSO/PEDOT:PSS and coating ZrC/polyurethane (PU) photothermal layer, and the morphology, structure and thermoelectric properties of the composites were characterized. The results show that when 0.5% NaOH and 3.5% DMSO are added, the power factor of NaOH/DMSO/PEDOT:PSS thermoelectric film reaches the peak value of 25.6 μW/(m·K²), which is 2 327 times that of pure PEDOT:PSS film. The Seebeck coefficient of the photothermal-thermoelectric composite material is 35.5 μV/K, and the voltage generated by the thermoelectric composite material under illumination after adding the photothermal layer is 6.3 times that of the thermoelectric composite material without a photothermal layer.