A facile hydrothermal method was developed for growing highly oriented, crystalline anatase TiO2 nanorods on transparent conducting substrates. The phase and morphology of the TiO2 nanocrystals can be controlled by tuning the pH and molar ratio. The oriented growth of anatase TiO2 nanorods requires the presence of both Cl- and SO42-. By testing the photoelectrochemical performance of samples grown under different conditions, we found that oriented anatase nanorod films exhibited the highest photocurrent, which was a consequence of the low defect density of the nanocrystals in the films. A photocurrent density of 1.2 mA cm-2 at 1.25 V vs RHE was obtained by self-doping with Ti3+ via electrochemical reduction. IPCE measurements show that the enhancement of photocurrent is due to the improved photoactivity in the UV region, as a result of the increased concentration of free carriers.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Materials Chemistry