Publication details

Authors: Kadakia, Karan Sandeep; Jampani, Prashanth H.; Velikokhatnyi, Oleg I.; Datta, Moni Kanchan; Park, Sung Kyoo; Hong, Dae Ho; Chung, Sung Jae; Kumta, Prashant N. 
Title: Nanostructured F doped IrO2 electro-catalyst powders for PEM based water electrolysis 
Type: Journal Article 
Publisher: Journal of Power Sources 
Year: 2014 
Volume: 269 
Start Page: 855 
End Page: 865 
DOI: 10.1016/j.jpowsour.2014.07.045 
Abstract: Fluorine doped iridium oxide (IrO2: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 (IrCl4 and NH4F) are mixed with NaNO3 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 IrO2:F with an optimum composition of IrO2:10 wt.% F shows remarkably superior electrochemical activity and chemical stability compared to pure IrO2. 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 <25 kJ mol1. Single full cell tests conducted also validate the superior electrochemical activity of the 10 wt.% F doped IrO2. 
Keywords: PEM water electrolysis, F doped IrO2, Nanostructured, High surface area, Electro-catalyst