Ghobadi, Türkan Gamze UlusoyGhobadi, AmirDemirtaş, M.Phul, RubyYıldız, E. A.Yağlıoğlu, H. G.Durgun, EnginÖzbay, EkmelKaradaş, Ferdi2022-02-172022-02-172021-02-242666-3864http://hdl.handle.net/11693/77457The realization of high-performance, precious-metal-free, stable, and robust photoanodes for water oxidation is one of the bottlenecks for dye-sensitized water splitting. Herein, we integrate an organic photosensitizer, which absorbs visible light above 500 nm, with a Prussian blue (PB) network to sensitize a visible-light-absorbing semiconductor, WO3. Through comprehensive steady-state and ultrafast transient absorption studies, we show that the coupling of a photosensitizer to a catalyst through a short cyanide bridging group in a PB structure generates appropriate energy levels for an efficient charge transfer from the photosensitizer to the visible-light-absorbing semiconductor. The photoanode retains its structural integrity and high photoelectrochemical activity for at least 2 h of solar irradiation under mildly acidic conditions (pH 3), which reaches around 1.30 mA/cm2 at 1.23 VRHE. This work provides a simple recipe with a toolbox that can be extended to a variety of organic photosensitizers and semiconductors.EnglishPhotosensitizer-catalystDye-sensitized water splittingCyanide chemistryRuthenium-freeWater oxidationPrussian blueOrganic chromophoreWO3PhotoelectrochemicalVisible-light-absorbing semiconductorsArticle10.1016/j.xcrp.2020.100319