Abstract
We describe ruthenium coordinated n-type polymer material as a sensitizer for TiO2 nanotubes for visible light driven photocatalytic production of hydrogen. The dye is a novel ruthenium coordinated BIAN (bisiminoacenaphthene)-Fluorene (2,7-Diethynyl-9,9-dioctyl-9H-fluorene) polymer. Photoresponse of the material was observed by measuring the changes in the open circuit potential voltage which showed a vertical drop of 0.57 V in the potential. From the I-V characteristics, the maximum value of photocurrent observed in the presence of visible light was 245 μA. The monitoring of rate of H2 evolution exhibited as high as 3.75 μmol/hour of H2 with the dye sensitized TiO2 nanotubes at a low bias potential of 0.15V (vs Ag/AgCl), compared to only 2.1 μmol/hour in case of bare TiO2 nanotubes even at higher bias potential of 0.5V. This shows the material has got the potential as a photocatalyst in the photoelectrochemical splitting of water.
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