  Ceramics based piezoelectric generators are known for their high energy
density and poor flexibility. In this work, v_r-PMN-0.3PT/PDMS 2-2 composite
with optimum PMN-0.3PT content (v_r) was designed that demonstrated enhanced
output energy density and superior mechanical flexibility under dynamic
mechanical excitation. v_r-PMN-0.3PT/PDMS 2-2 composite with different PMN-PT
reinforcement content (v_r) and two different reinforcement configurations were
fabricated and characterized for effective electro-elastic properties and
energy harvesting response. Parallelly, using the finite element method and
analytical models, effective electromechanical properties were calculated.
Composites with parallel connectivity of the reinforcement phase demonstrated
enhanced piezoelectric charge coefficient even with low PMN-0.3PT content
whereas the relative permittivity and elastic modulus exhibited a linearly
increasing trend with reinforcement volume fraction. At a compressive load of
50 N and 5 Hz frequency, a piezoelectric generator (PG) based on a v_r = 0.2,
v_r- PMN-0.3PT/PDMS 2-2 composite with parallel connectivity produced a maximum
short-circuit current density of 69 nA/cm2 and an open-circuit electric field
of 189 V/cm, translating to a maximum output power density of ~13 {\mu}W/cm3
higher than that of pristine PMN-0.3 PT based piezoelectric generator.
Estimated mechanical flexibility was found to be ~53 % higher than that of
pristine PMN-0.3PT.
