Ultrahigh Output Piezoelectric and Triboelectric Hybrid Nanogenerators Based on ZnO Nanoflakes/Polydimethylsiloxane Composite Films

We demonstrated a
hybrid nanogenerator (NG) exploiting both piezoelectric and triboelectric
effects induced from ZnO nanoflakes (NFs)/polydimethylsiloxane (PDMS)
composite films through a facile, cost-effective fabrication method.
This hybrid NG exhibited not only high piezoelectric output current
owing to the enhanced surface piezoelectricity of the ZnO NFs but
also high triboelectric output voltage owing to the pronounced triboelectrification
of Au–PDMS contact, producing a peak-to-peak output voltage
of ∼470 V, a current density of ∼60 μA·cm–2, and an average power density of ∼28.2 mW·cm–2. Without additional energy storage devices, the hybrid
NGs with an area of 3 × 3 cm2 instantaneously lit
up 180 commercial green light-emitting diodes through periodic hand
compression. This approach may provide an innovative design for constructing
high-performance and portable energy harvesting devices with enhanced
power output, scavenging ambient mechanical energy from human motions
in our daily life.