Piezoelectric　materials,　which　convert　mechanical　vibration　energy　into　electric　energy,　are　essential　for　vibration　energy　harvester.　Nevertheless,　the　piezoelectric　energy　harvesting　also　encounters　the　bottleneck　that　piezoelectric　materials　generally　produce　only　micro　scale　current　due　to　its　high　impedance.　In　this　work,　the　developed　lead-free　(Ba0.85Ca0.15)(0.9985)Sm-0.001(Ti0.9Zr0.1)O-3　(BCSm(0.001)TZ)　piezoelectric　ceramic　possesses　both　high　piezoelectric　charge　constant　and　low　impedance,　boosting　its　energy　harvesting　performance:　an　extremely　high　short-circuit　current　(60　mu　A)　and　large　power　density　(2.1　mu　W/mm(3))　in　a　cantilever-type　energy　harvester,　which　is　superior　to　those　of　other　reported　ones.　Due　to　the　giant　current　performance,　the　related　charging　speed　of　BCSm(0.001)TZ　energy　harvester　possessed　similar　to　100%　enhancement　relative　to　the　non-doped　counterpart.　Electrical　property　measurement　and　nanostructure　observation　revealed　that　the　outstanding　electromechanical　properties　as　well　as　energy　harvesting　performances　in　BCSm(0.001)TZ　ceramic　benefits　from　a　complex　domain　architecture　and　low　concentration　of　defect,　which　is　closely　associated　with　the　local　structural　heterogeneity　induced　by　the　rare-earth　Sm　doping.　This　work　provides　a　new　important　paradigm　for　developing　high-performance　viable　green　energy　materials　and　devices,　especially　for　the　fast　recharging　microelectronic　storage　devices　in　wireless　sensor　network.　(C)　2020　Acta　Materialia　Inc.　Published　by　Elsevier　Ltd.　All　rights　reserved.