The　core　of　realizing　large　output　power　density　(u)　of　piezoelectric　energy　harvesters　(PEHs)　is　to　develop　piezoceramics　with　a　high　figure　of　merit　(FoM(33),　=d(33)(2)/epsilon(0)epsilon(r)).　However,　the　challenge　of　achieving　high　piezoelectric　constant　(d(33))　accompanied　with　low　dielectric　constant　(epsilon(r))　still　exists　and　greatly　restricts　the　energy　harvesting　applications　of　piezoceramics.　Herein,　a　strategy　combining　morphotropic　phase　boundary　(MPB)　construction　and　ferroelectric　polarization　modulation　is　proposed,　resulting　in　the　decoupling　of　d(33)　and　epsilon(r).　A　large　FoM(33)　similar　to　17.4　pm(2)/N　is　achieved　in　the　Pb(Zn1/3Nb2/3)(0.1)(Hf0.49Ti0.51)(0.9)O-3　(PZNHT)　MPB　component　with　a　high　Curie　temperature　of　311　degrees　C,　which　is　superior　to　that　of　most　typical　perovskite　piezoceramics.　Benefitting　from　this,　the　PEH　assembled　by　the　PZNHT　ceramic　exhibits　a　higher　output　power　density　(u　similar　to　5.6　mW/cm(3))　than　many　reported　PEHs.　This　work　provides　a　useful　reference　for　the　development　of　piezoelectric　materials　with　excellent　energy　harvesting　characteristics.