An aqueous, organic dye derivatized SnO2/TiO2 core/shell photoanode

摘要: Visible light driven water splitting in a dye-sensitized photoelectrochemical cell (DSPEC) based on phosphonic acid-derivatized donor–π–acceptor (D–π–A) organic dye (P–A–π–D) is described with the anchored to an FTO|SnO2/TiO2 core/shell photoanode pH 7 phosphate buffer solution. Transient absorption measurements FTO|TiO2|–[P–A–π–D] compared core/shell, FTO|SnO2/TiO2(3 nm)|–[P–A–π–D], reveal that excitation of rapid and efficient decrease back electron rate by factor ∼10 core/shell. Upon visible, 1 sun (100 mW cm−2) nm)|–[P–A–π–D] at 20 mM added hydroquinone (H2Q), photocurrents ∼2.5 mA cm−2 are observed which sustained over >15 min photolysis periods current enhancement ∼30-fold due effect. On surfaces co-loaded both –[P–A–π–D] known oxidation catalyst, Ru(bda)(pyP)2 (pyP = pyridin-4-methyl acid), maximum photocurrent levels 1.4 were decreased 10 interval 0.1 cm−2. O2 was measured use two-electrode, collector–generator sandwich produced low faradaic efficiencies majority oxidative decomposition dye.