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The efficiency values shown in Fig. 9 are below values reported in literature for nitrogen doped titania films. In this work light scattering through the walls of the electrochemical cell could provoke a smaller ¡®effective¡¯ light intensity on the electrode.
Mor et al.  reported an efficiency of about 12.25% obtained for titanium dioxide samples annealed in the range of 580¨C620 ¡æ. The authors proposed that the increase in photocurrent and efficiency are due to the increased crystallinity of the nanotube-walls, with the reduction of the amorphous regions and grain boundaries . Khan et al. ) reported a maximum photoconversion efficiency of 8.35% using a chemically modified n-TiO2 produced by pyrolysis of a titanium metal sheet. The authors claimed that carbon atoms replaced some of the oxygen lattice atoms producing absorption of light at wavelengths below 535 nm and reducing the material band gap energy to 2.32 eV vs. 3 eV in rutile and 3.2 eV in anatase .
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