Piezoelectric　energy　harvesting　is　a　hot　topic　in　the　field　of　new　energy,　and　the　key　point　is　to　design　high　power　lead-free　piezoelectric　ceramic.　In　this　work,　a　novel　lead-free　material　system　of　(1-x)Ba(Zr0.1985Cu0.0015Ti0.8)O3-delta-x(Ba0.7Ca0.3)TiO3　[(1-x)BZCT-xBCT]　was　designed,　and　the　energy　harvesting　characteristics　were　tailored　through　the　composition-driven　phase　boundary　evolution.　The　R-O-T　phase　boundary　boosts　the　strong　piezoelectric　activity,　obtaining　an　optimal　energy　harvesting　performance.　In　the　mode　of　the　cantilever-type　energy　harvester,　a　high　output　power　of　70　mu　W　and　voltage　of　8　V　were　obtained　at　x=　0.55　specimen　with　a　low　resonance　frequency　of　90　Hz　and　acceleration　of　10　m/s(2),　which　were　further　increased　to　700　mu　W　and　25　V　when　the　acceleration　increased　to　50　m/s(2).　The　excellent　low　frequency　characteristics　show　the　potential　applications　of　this　material　in　piezoelectric　generators　harvesting　environmental　vibration　energy.　(C)　2017　Elsevier　Ltd.　All　rights　reserved.