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<p>Electrospinning technique was employed to fabricate polyvinylidene difluoride composite fibers containing well-dispersed potassium sodium niobate fine powder. The corresponding PVDF fiber-based PENG device delivered an open-circuit voltage of ~ 10.3&#xa0;V at a load resistance of 50 MΩ, a current density of ~ 0.126&#xa0;mA/m² at R<sub>L</sub> = 50 MΩ and maximum output power density of ~ 1.27 mW/m². With the addition of K₀.₅Na₀.₅NbO<sub>3</sub> fillers into the PVDF matrix significantly enhanced its piezoelectric response. The composite fiber-based PENG device with a KNN: PVDF mass ratio of 1:0.8 demonstrated a maximum power density of ~ 3.95 mW/m², an open-circuit voltage of ~ 22.5&#xa0;V at <i>R</i><sub><i>L</i></sub><i>=</i> 80 MΩ, and a short-circuit current density ~ 0.175&#xa0;mA/m² at <i>R</i><sub><i>L</i></sub> = 80 MΩ. These output values are far better than the previously reported results. The KNN/PVDF fiber-based PENG was efficient of directly lighting 38 LEDs and charging a 10µF capacitor via a rectifier circuit, which subsequently powered a hygrometer. These finding highlight the capacity of KNN/PVDF composite fibers as efficient piezoelectric materials for sustainable energy harvesting in flexible electronic devices.</p>

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Efficient PENG based on KNN/PVDF composite fibers for wearable and flexible energy harvesting devices

  • 期刊论文

  • 发表日期：

    2026年3月26日

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  • Jouhar Ud Din,
  • Sajid Khan,
  • Numan Ali,
  • Jasim Yousaf,
  • Khizar Hayat,
  • Said Karim Shah

摘要

Electrospinning technique was employed to fabricate polyvinylidene difluoride composite fibers containing well-dispersed potassium sodium niobate fine powder. The corresponding PVDF fiber-based PENG device delivered an open-circuit voltage of ~ 10.3 V at a load resistance of 50 MΩ, a current density of ~ 0.126 mA/m² at RL = 50 MΩ and maximum output power density of ~ 1.27 mW/m². With the addition of K₀.₅Na₀.₅NbO3 fillers into the PVDF matrix significantly enhanced its piezoelectric response. The composite fiber-based PENG device with a KNN: PVDF mass ratio of 1:0.8 demonstrated a maximum power density of ~ 3.95 mW/m², an open-circuit voltage of ~ 22.5 V at RL= 80 MΩ, and a short-circuit current density ~ 0.175 mA/m² at RL = 80 MΩ. These output values are far better than the previously reported results. The KNN/PVDF fiber-based PENG was efficient of directly lighting 38 LEDs and charging a 10µF capacitor via a rectifier circuit, which subsequently powered a hygrometer. These finding highlight the capacity of KNN/PVDF composite fibers as efficient piezoelectric materials for sustainable energy harvesting in flexible electronic devices.