An important requirement in a photoelectrochemical cell to water splitting is to reach the photo-voltage required to drive the oxidation and reduction reactions to produce oxygen and hydrogen without any other external energy supply.In this work, it was studied the effect of pH on the photovoltage of photoelectrochemical cell.Open circuit photo-voltage as a function of aqueous electrolyte pH has been investigated using the TiO 2 photoanode connected with a stainless steel photocathode.The open circuit photo-voltage measurements were made from 1 to 14 pH units, showing a decrease of photovoltage values with increasing pH.