The applicability of a non-conductive TiO 2 as the support of the anodic catalyst for PEM water electrolysis was tested. Three TiO 2 samples with different specific surface areas were modified by IrO 2 using a modified version of the Adams fusion method. A constant weight ratio of IrO 2 /TiO 2 of 0.6 was maintained in all cases. The size, specific surface area and morphology of IrO 2 electrocatalyst crystallites were investigated by X-ray diffraction, nitrogen adsorption (BET) and scanning electron microscopy, respectively. The electron conductivity of compressed catalyst powders was evaluated. Their electrochemical properties were studied on a rotating disk electrode (RDE) and finally in a laboratory electrolyser. Utilization of the TiO 2 support resulted in a reduction in the size of the IrO 2 crystallites. It was found that the lower the specific surface area of the supports, the higher was the electrochemical activity of the catalyst. This is most likely due to the formation of a conductive IrO 2 film on the surface of non-conductive supports. For the supports with a higher surface area, the amount of IrO 2 used was not sufficient to form an adequately compact film. This resulted in high electron resistance of such a catalyst. The RDE results were confirmed by a laboratory electrolysis test. Taken together with the excellent stability of TiO 2 in an anodic environment, these results suggest that these materials are promising supports if the appropriate amount of iridium is deposited.