110 Producing Fuels and Fine Chemicals from Biomass Using Nanomaterials
et al. 2009; Park et al. 2005) on carbon-doped titania tubes for photoelectrochemi-
cal water splitting. Park et al. (2005) discussed the higher photocurrent densities
and more efcient water splitting of vertically grown carbon-doped TiO
2
nanotube
arrays with high aspect ratios (∼3 μm length) under the visible-light illumination
than those of pure titania nanotube arrays. The difference between this system and
using the dye-sensitized photoelectrochemical cell for water splitting is that carbon-
doped titania tubes directly used as both photoelectrode and light collector absorbed
the visible light without any help from the dye.
4.3 CONCLUSIONS
In the water splitting process, ...