Abstract
A simple and cost-effective approach was developed to fabricate piezoelectric and triboelectric nanogenerator (P-TENG) with high electrical output. Additionally, pyramid micro structures fabricated atop a polydimethylsiloxane (PDMS) surface were employed to enhance the device performance. Furthermore, piezoelectric barium titanate (BT) nanoparticles and multiwalled carbon nanotube (MWCNT) were mixed in the PDMS film during the forming process. Meanwhile, the composition of the film was optimized to achieve output performance, and favorable toughness was achieved after thermal curing. An arch-shape ITO/PET electrode was attached to the upper side of the polarized composite film and an aluminum film was placed under it as the bottom electrode. With periodic external force at 20 Hz, electrical output of this P-TENG, reached a peak voltage of 22 V and current of 9 μA with a peak current density of 1.13 μA/cm2, which was six times that of the triboelectric generator without BT and MWCNT nanoparticles. The nanogenerator can be directly used to lighten 28 commercial light-emitting diodes (LEDs) without any energy storage unit or rectification circuit under human footfalls.
Highlights
As an attractive substitution for conventional power supply, harvesting energy from the ambient environment is an effective way to achieve self-powered systems and further fulfill large-scale energy needs [1,2,3]
This may be because, as the value of V increased, some particles inside the composite film could pass through the surface of film, resulting in an increase in the triboelectric effect
The working principle of this arch-shape nanogenerator can be depicted as followed in Figure 3, combining piezoelectric and triboelectric mechanism
Summary
As an attractive substitution for conventional power supply, harvesting energy from the ambient environment is an effective way to achieve self-powered systems and further fulfill large-scale energy needs [1,2,3]. A nanogenerator converting vibrational and mechanical energy to electric energy based on the piezoelectric effect has been proved to be an effective approach by Wang and Song [1] and Lee’s groups [4]. Technology has been further introduced to employ a system that can convert frictional energy sources into electrical energy [9,10,11,12,13]. Piezoelectric cantilevers and structured PDMS film have been combined to enhance the structure performance [14], there have been few reports about the technology of combining piezoelectric and triboelectric mechanism to optimize the material property and thereby obtain high voltage output. We developed a hybrid nanogenerator based on piezoelectric and triboelectric principle by employing surface-nanostructured polydimethylsiloxane (PDMS) film, barium titanate (BT) and multiwalled carbon nanotube (MWCNT) nanoparticles. Doctor-blade coating technology was used to fabricate the device and the output performances were investigated
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