Synergetic effects in composite-based flexible hybrid mechanical energy harvesting generator
Energy scavenging techniques based on the piezoelectric and triboelectric effects have become increasingly attractive in last few years due to their efficient working process as well as promising output potential. Here, we fabricate hybrid generators based on PDMS composite films embedded with a range of functional materials combining both piezoelectric and triboelectric properties. Meanwhile, generators of single effect are also fabricated in order to analyze the output contribution of each effect in contrast to the combined effect and to understand the impact of each material on the piezoelectricity or triboelectricity during the power generation process. An average open-circuit voltage of 48.46V with an energy conversion efficiency of 31.62% are achieved by a device based on PDMS composite with PVDF/MWCNT/BaTiO3. The ratio between triboelectric and piezoelectric effects in composite generators is also introduced and analyzed in this work. Our findings not only indicate that individual materials in a composite can synergistically enhance their intrinsic properties, but also validate that the capacity of composites in converting mechanical energy is far beyond individual material.