The　design　of　photoanode　materials　to　achieve　efficient　water　splitting　is　a　current　research　hotspot　in　photoelectrochemical　(PEC).　In　this　work,　we　designed　and　prepared　an　α-Fe2O3/BiVO4　heterostructure　modified　by　carbon　quantum　dots　((α-Fe2O3/BiVO4/CQDs))　as　the　photoanode.　The　modification　of　CQDs　can　broaden　the　sunlight　absorption　ability　and　dramatically　enhance　the　water　oxidation　kinetics　of　α-Fe2O3/BiVO4/CQDs.　The　optimized　photoanode　demonstrated　a　photocurrent　density　of　1.32　mA·cm−2　at　1.23　V　vs.　RHE,　which　is　2.2　times　than　pristine　α-Fe2O3　(0.6　mA·cm−2)　photoanode.　The　IPCE　value　above　29.4　%　at　400　nm,　and　the　onset　potential　is　negatively　shifted　by　243　mV　for　α-Fe2O3/BiVO4/CQDs.　The　improved　performance　is　mainly　due　to　the　α-Fe2O3/BiVO4　heterojunction　to　achieve　effective　separation　of　photogenerated　carriers　in　the　bulk　phase　and　CQDs　to　improve　light　utilisation　and　OER　kinetics　of　the　photoanode.　©　2024