Investigation of photoelectrochemical production of reactive chlorine species on BiVO4 photoanode Milda Petruleviciene, Irena Savickaja, Jurga Juodkazyte Center for Physical Science and Technology, Sauletekio av.3, LT-10257 Vilnius With growing demand for sustainable material synthesis routes, photoelectrochemical (PEC) energy conversion is attracting increasing attention in such areas as production of strong oxidants (hypochlorite, persulfate, hydrogen peroxide), purification of wastewater, disinfection, etc [1]. In this work we investigated photo-induced generation of reactive chlorine species (RCS) using BiVO4 photoelectrode in 0.5 M NaCl electrolyte. Crystalline structure and morphology of coatings is known to play important role in PEC performance of photoanodes. Faradic efficiency (FE) of photoelectrochemical RCS generation and longterm stability of undoped and Mo-doped BiVO4 coatings were compared. FEs of ClO- + ClO2- formation as high as 100 % with excellent photocurrent stability were found in the case of Mo-doped BiVO4 samples. Literature: [1] K. Sekar, Appl. Mater. Today 2021, 22, 100963. Acknowledgement: This research was funded by the M-ERA.NET project “Multiscale computer modelling, synthesis and rational design of photo(electro)catalysts for efficient visible-light-driven seawater splitting”(CatWatSplit), Reference Number: project8168, under a grant agreement Nr. S-M-ERA.NET-21-3 with the Research Council of Lithuania (LMTLT).