Journal
CHEMSUSCHEM
Volume 6, Issue 1, Pages 152-159Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201200408
Keywords
dyes; pigments; photochemistry; ruthenium; titanium; water splitting
Funding
- BMBF as part of the L2H network of the Spitzenforschung & Innovation in den Neuen Bundeslandern initiative
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Visible-light-driven photocatalysis is currently attracting a great deal of attention because of its potential application in solar water splitting. However, the development of efficient and durable catalyst systems is still a challenging problem. In Ru dye-sensitised TiO2 nanopowders, catalyst performances are found to decline as a result of poor bonding of the dye molecule to the TiO2 surface and subsequent detachment and self-aggregation of the dye. Our strategy to improve the stability of the dyeTiO2 interface is the encapsulation of the dye/TiO2 assembly in an amino-group-containing polyallylamine layer anchored to TiO2. A low-pressure pulsed microwave discharge plasma polymerization process was employed to coat a commercial anatase nanopowder with a thin polyallylamine layer to nanoconfine the adsorbed dye molecules. Electron microscopy and UV/Vis spectroscopy was carried out to characterise the resulting encapsulated nanostructures. The long-term stability of the new nanomaterial as the photoactive component of a water reduction catalyst system for H2 evolution investigated in a slurry reactor under visible-light irradiation showed stable evolution rates over a period of several days.
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