A　highly　efficient　photoelectrochemical　(PEC)　strategy　was　proposed　for　the　determination　of　ascorbic　acid　(AA).　Cerium-doped　tungsten　trioxide　(Ce-WO3)　microrods　were　synthesized　by　a　hydrothermal　method　and　further　characterized　through　transmission　electron　microscopy　(TEM),　X-ray　diffraction　(XRD),　and　Raman　spectroscopy.　Thereafter,　they　were　deposited　onto　a　cleaned　fluorine-doped　tin　oxide　(FTO)　glass　forming　the　working　electrode　as　the　photoactive　material.　Under　strong　visible　light　irradiation,　the　resulting　PEC　sensing　platform　generated　the　corresponding　electron-hole　pairs,　converting　light　signals　into　electrical　signals.　Ascorbic　acid　served　as　a　good　electron　donor　to　trap　holes　for　improvement　of　photocurrent　responses　on　Ce-WO3/FTO.　Besides,　the　strength　of　photocurrent　signals　versus　the　logarithm　of　ascorbic　acid　concentration　showed　a　good　linearity　over　the　ascorbic　acid　concentration　range　of　100-4000　nM　and　the　limit　of　detection　(LOD)　was　estimated　to　be　28.6　nM.　Importantly,　this　PEC　sensor　had　a　fast　response,　high　sensitivity,　and　distinguished　selectivity　for　detecting　ascorbic　acid.　In　addition,　it　also　had　the　features　of　being　simple　to　fabricate,　low　production　cost,　and　portable,　which　made　it　a　promising　means　of　ascorbic　acid　determination.　©　2024　The　Royal　Society　of　Chemistry.