Nanostructured F doped IrO2 electro-catalyst powders for PEM based water electrolysis

JOURNAL OF POWER SOURCES

卷:269

Article

Kadakia, Karan Sandeep¹  Jampani, Prashanth H.¹  Velikokhatnyi, Oleg I.^2,3  Datta, Moni Kanchan^2,3  Park, Sung Kyoo²  Hong, Dae Ho²  Chung, Sung Jae⁴  Kumta, Prashant N.^1,2,3,4,5 

[1] Univ Pittsburgh, Dept Chem & Petr Engn, Swanson Sch Engn, Pittsburgh, PA 15261 USA

[2] Univ Pittsburgh, Dept Chem & Petr Engn, Dept Bioengn, Pittsburgh, PA 15261 USA

[3] Univ Pittsburgh, Ctr Complex Engn Multifunct Mat, Pittsburgh, PA 15261 USA

[4] Univ Pittsburgh, Swanson Sch Engn, Dept Mech Engn & Mat Sci, Pittsburgh, PA 15261 USA

[5] Univ Pittsburgh, Sch Dent Med, Dept Oral Biol, Pittsburgh, PA 15217 USA

关键词: PEM water electrolysis;    F doped IrO2;    Nanostructured;    High surface area;    Electra-catalyst;   

DOI  :  10.1016/j.jpowsour.2014.07.045

来源: Elsevier

【 摘 要 】

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 (IrCI4 and NH4F) are mixed with NaNO3 and heated to elevated temperatures to form high surface area nanomaterials as electrocatalysts 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 (ROE) experiments. The RDE studies confirm that the electro-catalysts follow the two electron transfer reaction for electrolysis with calculated activation energy of similar to 25 kJ mol(-1). Single full cell tests conducted also validate the superior electrochemical activity of the 10 wt.% F doped IrO2. (C) 2014 Elsevier B.V. All rights reserved.

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