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首页> 外文期刊>ACS applied materials & interfaces >Flexible Supercapacitor-Type Rectifier-free Self-Charging Power Unit Based on a Multifunctional Polyvinylidene Fluoride-ZnO-rGO Piezoelectric Matrix
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Flexible Supercapacitor-Type Rectifier-free Self-Charging Power Unit Based on a Multifunctional Polyvinylidene Fluoride-ZnO-rGO Piezoelectric Matrix

机译：基于多官能聚偏二氟乙烯 - ZnO-RGO压电基质的柔性超级电容器型整流自充电电源单元

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The development of an effective mechanical to electrical energy conversion device and its functional integration with an energy storage device for self-powered portable gadgets are cutting-edge research fields. However, the generated power and the mechanical stability of these integrated devices are still not efficient to power up portable electronics. We fabricated a rectifier-free piezoelectric nanogenerator (NG) integrated with a supercapacitor (SC). A multifunctional composite matrix was prepared by the incorporation of ultrathin (<10 nm) ZnO nanoflakes and reduced graphene oxide in polyvinylidene fluoride to enhance the piezoelectric output characteristics and mechanical stability of the device while minimizing the additional energy losses during the integration. The as-fabricated SC-based power unit through the energy conversion and storage processes showed a remarkable self-charging performance. We obtained the maximum output voltage, current density, and power density of about 44 V, 1000 nA cm(-2), and 193.6 mu W cm(-2) under the applied mechanical force of 10 N, respectively. The self-charging behavior of the device showed that it can store 1.5 x 10(-3) mC within 100 s without resorting to a rectifier. We obtained the total energy density of about 10.34 mW h kg(-1) under palm impact. Our results present a step forward in the development of the NG and SC-based flexible and self-charging devices.
机译：为电能转换装置的有效机械的开发及其与用于自动便携式小工具的能量存储装置的功能集成是尖端的研究领域。然而，这些集成器件的产生功率和机械稳定性仍然不高效地电动便携式电子设备。我们制造了一种与超级电容器（SC）集成的无晶系压电纳米电磁体（NG）。通过掺入超薄（<10nm）ZnO纳米薄片和在聚偏二氟乙烯中的氧化物还原的石墨烯氧化物制备多官能复合基质，以增强装置的压电输出特性和机械稳定性，同时在整合过程中最小化额外的能量损失。通过能量转换和存储过程制造的SC基功率单元显示出显着的自充电性能。在施加的机械力的施加的机械力下，我们获得了大约44V，1000na cm（-2）和193.6μWcm（-2）的最大输出电压，电流密度和功率密度。设备的自充电行为显示它可以在100秒内存储1.5 x 10（3）个MC，而不诉诸整流器。在棕榈撞击下，我们获得了约10.34毫升H千克（-1）的总能量密度。我们的结果在开发NG和基于SC的灵活和自充电装置方面存在一步。

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