Churros-like Polyvinylidene Fluoride Nanofibers for Enhancing Output Performance of Triboelectric Nanogenerators
Churros-like Polyvinylidene Fluoride Nanofibers for Enhancing Output Performance of Triboelectric Nanogenerators
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DOI：
10.1021/acsami.0c00708
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发表时间：
2020-04-15
影响因子：
9.5
通讯作者：
Park, Il-Kyu
中科院分区：
文献类型：
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作者：
Kong, Tae-Hoon;Lee, Sang-Seok;Park, Il-Kyu
摩擦电纳米发电机(TNG)已成为物联网技术的下一代可持续能源。聚偏氟乙烯(PVDF)纳米纤维通过控制其极性来提高TENG性能已被广泛研究，但对PVDF纳米纤维表面形貌的控制研究较少。通过控制溶剂挥发动力学，制备了表面粗糙、呈面团状的聚偏氟乙烯纳米纤维。在电纺过程中，通过改变相对湿度(RH)来调节溶剂的挥发速度。随着相对湿度的增加，PVDF-NFS中极性β相的比例增加，比表面积逐渐增大，表面形态由光滑向粗糙转变，最终形成类面团结构。因此，TENG器件的输出性能随着相对湿度的增加而提高，这是由于PVDFNFN中极性相比例增加和比表面积增大的共同作用。采用搅拌式PVDF NFS的Teng器件输出电压为234V，电流为11 mA，功率密度高达1738 mW/cm(2)，使其能够在不使用外部电荷存储电路的情况下打开60个串联的商用发光二极管。
Triboelectric nanogenerators (TENGs) have emerged as a next-generation sustainable power source for Internet of Things technology. Polyvinylidene fluoride (PVDF) nanofibers (NFs) have been investigated widely to enhance the TENG performance by controlling their polarity; however, controlling the surface morphology of the PVDF NFs has rarely been studied. Here, surface-roughened, churros-like PVDF NFs were fabricated by controlling the solvent evaporation kinetics. The solvent evaporation rate was modulated by varying the relative humidity (RH) during the electrospinning process. With increasing RH, the fraction of polar beta-phase in the PVDF NFs increased, the specific surface area of the PVDF NFs increased gradually and the surface morphology changed from smooth to rough, finally resulting in a churros-like structure. Therefore, the output performance of the TENG devices was enhanced with increasing RH, because of the combined effects of the enlarged surface area and the increased fraction of the polar phase in the PVDF NFs. The TENG device with the churros-like PVDF NFs showed an output voltage of 234 V, current of 11 mu A, and power density up to 1738 mu W/cm(2), giving it the capability to turn on 60 series-connected commercial light-emitting diodes without using an external charge storage circuit.