Platinum　(Pt)-based　alloys　are　considerably　promising　electrocatalysts　for　the　reduction　of　I-/I-3(-)　and　Co2+/Co3+　redox　couples　in　dye-sensitized　solar　cells　(DSSCs).　However,　it　is　still　challenging　to　minimize　the　dosage　of　Pt　to　achieve　comparable　or　even　higher　catalytic　efficiency.　Here,　by　taking　full　advantages　of　the　Mott-Schottky　(M-S)　effect　at　the　metal-semiconductor　interface,　we　successfully　strategize　a　low-Pt-based　M-S　catalyst　with　enhanced　electrocatalytic　performance　and　stability　for　the　large-scale　application　of　DSSCs.　The　optimized　M-S　electrocatalyst　of　Ni3S4-Pt2X1　(X　=　Fe,　Ni)　heteronanorods　is　constructed　by　rationally　controlling　the　ratio　of　Pt　to　transition　metal　in　the　hybrids.　It　was　found　that　the　electrons　transferred　from　Ni3S4　to　Pt2X1　at　their　interface　under　the　Mott-Schottky　effect　result　in　the　concentration　of　electrons　onto　Pt2X1　domains,　which　subsequently　accelerates　the　regeneration　of　both　I-/I-3(-)　and　Co2+/Co3+　redox　shuttles　in　DSSCs.　As　a　result,　the　DSSC　with　Ni3S4-Pt2Fe1　manifests　an　impressive　power　conversion　efficiency　(PCE)　of　8.79%　and　5.56%　for　iodine　and　cobalt-based　electrolyte　under　AM1.5G　illumination,　respectively.　These　PCEs　are　obviously　superior　over　those　with　Ni3S4-Pt,　PtFe,　Ni3S4,　and　pristine　Pt　electrodes.　The　strategy　reported　here　is　able　to　be　further　expanded　to　fabricate　other　low-Pt-alloyed　M-S　catalysts　for　wider　applications　in　the　fields　of　photocatalysis,　water　splitting,　and　heterojunction　solar　cells.