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Green Biocomposites for Thermoelectric Wearable Applications

机译：用于热电可穿戴应用的绿色生物复合材料

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摘要

The materials commonly used to fabricate thermoelectric devices are tellurium, lead, and germanium. These materials ensure the best thermoelectric performance, but exhibit drawbacks in terms of availability, sustainability, cost, and manufacturing complexity. Moreover, they do not guarantee a safe and cheap implementation in wearable thermoelectric applications. Here, p-Type and n-type flexible thermoelectric textiles are produced with sustainable and low-cost materials through green and scalable processes. Cotton is functionalized with inks made with biopolyester and carbon nanomaterials. Depending on the nanofiller, i.e., graphene nanoplatelets, carbon nanotubes, or carbon nanofibers, positive or negative Seebeck coefficient values are obtained, resulting in a remarkable electrical conductivity value of 55 S cm(-1) using carbon nanotubes. The best bending and washing stability are registered for the carbon nanofiber-based biocomposites, which increase their electrical resistance by 5 times after repeated bending cycles and only by 30% after washing. Finally, in-plane flexible thermoelectric generators coupling the best p- and n-type materials are fabricated and analysed, resulting in an output voltage of approximate to 1.65 mV and a maximum output power of approximate to 1.0 nW by connecting only 2 p thermocouples at a temperature difference of 70 degrees C.
机译：通常用于制造热电器件的材料是碲，铅和锗。这些材料可确保最佳的热电性能，但在可用性，可持续性，成本和制造复杂性方面存在缺陷。而且，它们不能保证在可穿戴热电应用中的安全和廉价实施。在这里，p型和n型柔性热电纺织品是通过绿色且可扩展的工艺使用可持续且低成本的材料生产的。棉花可以用生物聚酯和碳纳米材料制成的油墨进行功能化。根据纳米填料（即石墨烯纳米片，碳纳米管或碳​​纳米纤维）的不同，可以获得正或负的塞贝克系数值，使用碳纳米管可获得55 S cm（-1）的出色电导率值。碳纳米纤维基生物复合材料具有最佳的弯曲和洗涤稳定性，在反复弯曲循环后，其电阻增加了5倍，洗涤后仅增加了30％。最终，制造并分析了耦合最佳p型和n型材料的面内柔性热电发生器，仅连接2 p / n即可得到大约1.65 mV的输出电压和大约1.0 nW的最大输出功率。温度差为70摄氏度的热电偶。

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