Department of Physics, Jadavpur University, Kolkata700032, India.
School of Materials Science and Nanotechnology, Jadavpur University, Kolkata700032, India.
ACS Appl Mater Interfaces. 2023 Feb 15;15(6):8446-8461. doi: 10.1021/acsami.2c17538. Epub 2023 Jan 31.
With the contemplations of ecological and environmental issues related to energy harvesting, piezoelectric nanogenerators (PNGs) may be an accessible, sustainable, and abundant elective wellspring of energy in the future. The PNGs' power output, however, is dependent on the mechanical energy input, which will be intermittent if the mechanical energy is not continuous. This is a fatal flaw for electronics that need continuous power. Here, a self-charging flexible supercapacitor (PSCFS) is successfully realized that can harvest sporadic mechanical energy, convert it to electrical energy, and simultaneously store power. Initially, chemically processed multimetallic oxide, namely, copper cobalt nickel oxide (CuCoNiO) is amalgamated within the poly(vinylidene fluoride) (PVDF) framework in different wt % to realize high-performance PNGs. The combination of CuCoNiO as filler creates a notable electroactive phase inside the PVDF matrix, and the composite realized by combining 1 wt % CuCoNiO with PVDF, coined as PNCU 1, exhibits the highest electroactive phase (>86%). Under periodic hammering (∼100 kPa), PNGs fabricated with this optimized composite film deliver an instantaneous voltage of ∼67.9 V and a current of ∼4.15 μA. Furthermore, PNG 1 is ingeniously integrated into a supercapacitor to construct PSCFS, using PNCU 1 as a separator and CuCoNiO nanowires on carbon cloth (CC) as the positive and negative electrodes. The self-charging behavior of the rectifier-free storage device was established under bending deformation. The PSCFS device exhibits ∼845 mV from its initial open-circuit potential ∼35 mV in ∼220 s under periodic bending of 180° at a frequency of 1 Hz. The PSCFS can power up various portable electronic appliances such as calculators, watches, and LEDs. This work offers a high-performance, self-powered device that can be used to replace bulky batteries in everyday electronic devices by harnessing mechanical energy, converting mechanical energy from its environment into electrical energy.
随着对与能量收集相关的生态和环境问题的思考，压电纳米发电机 (PNG) 可能成为未来一种易于获取、可持续且丰富的可选能源。然而，PNG 的功率输出取决于机械能输入，如果机械能不连续，那么输出也将是间歇性的。对于需要连续供电的电子设备来说，这是一个致命的缺陷。在这里，成功实现了一种自充电柔性超级电容器 (PSCFS)，它可以收集零星的机械能，将其转化为电能，并同时存储能量。首先，通过化学处理合成了多金属氧化物，即铜钴镍氧化物 (CuCoNiO)，并以不同的重量百分比与聚偏二氟乙烯 (PVDF) 骨架结合，以实现高性能的 PNG。将 CuCoNiO 作为填充物结合到 PVDF 中，形成一个显著的电活性相，在 1wt%CuCoNiO 与 PVDF 复合的情况下，实现了最高的电活性相 (>86%)，并称其为 PNCU1。在周期性敲击（约 100kPa）下，由优化后的复合膜制成的 PNG 可产生瞬时电压约 67.9V，电流约 4.15μA。此外，PNG1 被巧妙地集成到超级电容器中，以构建 PSCFS，使用 PNCU1 作为分离器，CuCoNiO 纳米线在碳布 (CC) 上作为正负极。在弯曲变形下，建立了无整流器存储装置的自充电行为。在周期性 180°弯曲，频率为 1Hz 的情况下，PSCFS 装置在约 220s 内从初始开路电压约 35mV 增加到约 845mV。PSCFS 可以为各种便携式电子设备供电，如计算器、手表和 LED。这项工作提供了一种高性能的自供电设备，可以通过利用环境中的机械能，将其转化为电能，从而替代日常电子设备中体积庞大的电池。
