Browsing by Subject "Photosensitizer-catalyst"

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    Pushing the limits in photosensitizer-catalyst interaction via a short cyanide bridge for water oxidation
    (Cell Press, 2021-02-24) Ghobadi, Türkan Gamze Ulusoy; Ghobadi, Amir; Demirtaş, M.; Phul, Ruby; Yıldız, E. A.; Yağlıoğlu, H. G.; Durgun, Engin; Özbay, Ekmel; Karadaş, Ferdi
    The 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.