This　study　explores　the　enhancement　of　alpha-Fe2O3　(hematite)　nanorod　arrays　for　photoelectrochemical　applications　by　constructing　a　Cu2ZnSnS4　(CZTS)　heterojunction.　While　alpha-Fe2O3　offers　good　stability,　a　low　cost,　and　environmental　benefits,　its　efficiency　is　limited　by　slow　oxygen　evolution　kinetics,　high　carrier　recombination　rates,　and　low　conductivity.　By　introducing　CZTS,　a　material　with　strong　light　absorption　and　charge　transport　properties,　we　enhance　the　separation　of　photogenerated　charge　carriers,　reduce　charge　transfer　resistance,　and　increase　the　carrier　concentration,　thereby　boosting　the　overall　photoelectrochemical　performance.　The　experimental　results　show　that　a　modified　FC-15　photoanode　achieves　a　photocurrent　density　of　3.40　mA/cm(2)　at　1.60　V　vs.　RHE,　a　substantial　increase　compared　to　0.40　mA/cm(2)　for　unmodified　alpha-Fe2O3.　Band　gap　analysis　reveals　a　reduced　band　gap　in　the　FC-15　material,　enhancing　light　absorption　and　boosting　the　photoelectrocatalytic　performance.　In　photoelectrochemical　water-splitting　tests,　the　FC-15　photoanode　achieves　a　hydrogen　production　rate　of　41.6　mu　mol/cm(2)/h,　which　is　significantly　improved　over　the　unmodified　sample　at　5.64　mu　mol/cm(2)/h.　These　findings　indicate　that　the　CZTS/alpha-Fe2O3　heterojunction　effectively　promotes　charge　separation,　enhances　charge　transport,　and　improves　light　absorption,　substantially　increasing　photocatalytic　efficiency.　This　heterojunction　approach　offers　new　insights　and　technical　strategies　for　developing　photocatalytic　materials　with　potential　applications　in　renewable　energy.