Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7735970 | Journal of Power Sources | 2014 | 11 Pages |
Abstract
126Fluorine doped iridium oxide (IrO2:F) powders with varying F content ranging from 0 to 20Â 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 IrO2:10Â 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 â¼25Â kJÂ molâ1. Single full cell tests conducted also validate the superior electrochemical activity of the 10Â wt.% F doped IrO2.
Related Topics
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Chemistry
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Authors
Karan Sandeep Kadakia, Prashanth H. Jampani, Oleg I. Velikokhatnyi, Moni Kanchan Datta, Sung Kyoo Park, Dae Ho Hong, Sung Jae Chung, Prashant N. Kumta,