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Fluorine doped iridium oxide (IrO 2 :F) powders with varying F content ranging from 0 to 20 wt.% has been synthesized by using a modification of the Adams fusion method. The precursors (IrCl 4 and NH 4 F) are mixed with NaNO 3 and heated to elevated temperatures to form high surface area nanomaterials as electro-catalysts for PEM based water electrolysis. The catalysts were then coated on a porous Ti substrate and have been studied for the oxygen evolution reaction in PEM based water electrolysis. The IrO 2 :F with an optimum composition of IrO 2 :10 wt.% F shows remarkably superior electrochemical activity and chemical stability compared to pure IrO 2. The results have also been supported via kinetic studies by conducting rotating disk electrode (RDE) experiments. The RDE studies confirm that the electro-catalysts follow the two electron transfer reaction for electrolysis with calculated activation energy of ~25kJ/mol. Single full cell tests conducted also validate the superior electrochemical activity of the 10 wt.% F doped IrO 2 .