[1그룹 1세부/김상재] High-Performance Piezoelectric Nanogenerator and Self-Charging Photo Power Cell Using Hexagonal Boron Nitride Nanoflakes and PVDF Composite

Abstract

Two-dimensional (2D) piezoelectric hexagonal boron nitride nanoflakes (h-BN NFs) exhibit substantial potential for energy harvesting, electronics, and optoelectronics applications. Herein, a free-standing PVDF/h-BN NFs (Ph-BN) composite film is synthesized for multi-functional purposes. First and foremost, a piezoelectric nanogenerator (PENG) device is fabricated using free-standing Ph-BN composite films and the energy harvesting properties are performed. The nanogenerator, Ph-BN-7.5 PENG, exhibits the highest output voltage of 50 V and current of 250 nA with a maximum power of about 2 μW compared to other fabricated composite devices. Further, a photo power cell (PPC) is fabricated using PVA-EY mixture dye as the photosensitive part or solar energy absorber, and Ph-BN 7.5 film is utilized as the energy storage part. The PPC is self-charged up to ≈1 V within 80 s under light illumination. The self-charging mechanism for PPC is explained in detail. The Ph-BN composite films demonstrate an innovative energy harvesting and storage approach, which can fulfill the energy prerequisite in the imminent future.