The growing demand for environmentally clean energy because of depletion of fossil fuel resources and the issues of climate change, such as global warming, caused the need for environmentally stable sources of energy. Renewable energy can be obtained from stable resources. Solar energy has the large prospects as an alternative source of energy, because its feed is un-limited and free. 

Goal of the project is the preparation of TiO₂ nanoparticles for dye-sensitized photoelectrochemical solar cell. We propose a new method of TiO₂ electro-generation. TiO₂ nanoparticles have been obtained by Ti foil anodic dissolution in 0.1-1M HCl solution, where hydrogen peroxide solution (30%) drop by drop has been added, cathode was stainless steel foil, and current density in different tests has been changed from 0.2 A/cm² to 1A/cm², voltage has been changed from 8 V to12 V, respectively. Electrochemical processes have been carried out at 90^oC at steering rate 800 rpm. TiO₂ has been directly obtained in electrolyte solution. This method gives allows to control a size of generated TiO₂ particles by changing current density and hydrogen peroxide addition rate. TiO₂ nanoparticles have been identified by X-ray diffraction (XRD) and scanning electron microscope (SEM) with particle size 50-500 nm. Finally, dye-sensitized photoelectrochemical solar cell has been fabricated. 

Electrochemical properties of the solar cell (i-V and I-P  curves): open circuit voltage 0.63 V, short circuit current  12 mA/cm², maximum power 4 mW/cm² and current density at the maximum power - 7.5 mA/cm², fill factor (ff) - 0.538, light energy conversion efficiency - 8.0%.