Significantly enhanced energy harvesting based on Ba(Ti,Sn)O 3 and P(VDF-CTFE) composite by piezoelectric and triboelectric hybrid

The demand of power supply for micro-devices results in the exploration of energy harvesting. A simple method was developed to construct hybrid energy harvester (HEH) consisting of piezoelectric energy harvester (PEH) and triboelectric energy harvester (TEH). The Mn-doped Ba(Ti,Sn)O3 (BTS) piezoelectric particles with an average size of 0.64 µm were used in the PEH unit. The polyimide with high electronegativity was used in the TEH unit. The P(VDF-CTFE)/BTS composite film exhibited a uniform distribution of BTS particles in P(VDF-CTFE) and a weak β-phase transformation. The open-circuit voltage and short-circuit current of the HEH were discussed at different BST content and external force. The HEH with 2 wt% BTS content shown an optimal output with 4.1 V and 2.5 µA. The HEH was sensitive to vertical stress, which can generate 12 V under a vertical force by fist. The HEH illustrated high stability after 800 cycles, which can obtain stable open-circuit voltage. This work provides a hybrid method of piezoelectric and triboelectric effects for energy-harvesting.