Fabrication and photoelectrochemical studies of BiTiO pyrochlore thin films by aerosol assisted chemical vapour deposition
2014-12-02T16:07:59Z (GMT) by
Phase pure thin film BiTiO photoelectrodes were produced by aerosol assisted chemical vapour deposition at 600 °C for the first time. X-ray diffraction analysis showed that the as-deposited BiTiO films were amorphous in nature; however, post-deposition annealing at 600°C for 12 h significantly increased the crystallinity to give phase pure BiTiO. Scanning electron microscopy revealed that the as-deposited film had a cauliflower-like structure with features ranging from 0.5 to 1.0 μm in size. It was found that the post-annealing step sintered the features together reducing the pores in the structure and giving rise to larger features of 1.0-2.0 μm in size. Optical studies showed that the BiTiO film had a direct band gap of 2.74 eV. The photoelectrochemical properties of BiTiO were tested and it was found that the electrodes exhibited a photocurrent density of 1.8 μA cm at 0.23 V vs. Ag|AgCl. Results showed that BiTiO is an attractive material for photoelectrochemical water splitting.