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O: Fachverband Oberflächenphysik
O 60: Poster Session IV (Solid/liquid interfaces; Semiconductors; Oxides and insulators; Graphene; Plasmonics and nanooptics; Electronic Structure; Surface chemical reactions; Heterogeneous catalysis)
O 60.18: Poster
Wednesday, March 16, 2011, 17:30–21:00, P4
Photocatalytic CO2 reduction on dye sensitized TiO2 — •Leo Pöttinger1 and Thomas Bürgi2 — 1Im Neuenheimer Feld 253, D- 69117 Heidelberg — 230 Quai Ernest-Ansermet, CH-1211 Genève 4
Reducing the greenhouse gas CO2 and substituting fossil fuels are challenging tasks for the future. The photocatalytic recycling of CO2 to hydrocarbons with sunlight as renewable energy is therefore investigated. Attenuated total reflection infrared (ATR-IR) spectroscopy was used to probe a thin layer of porous TiO2. In the first step "in-situ" adsorption experiments of CO2 and dyes with exposure to UV and visible light were performed. Furthermore metal co-catalysts were added to enhance the photocatalytic activity. The ATR-IR measurements show stable carbonates on the TiO2 nanoparticles after purging the CO2 saturated aqueous solution with pure water. After irradiation with UV light the carbonate bands vanish. The same characteristics can be observed with dye sensitized TiO2 and visible light exposure. The increase of new bands could be a hint of intermediate products in the multiple electron process towards methanole.