WEB Implementation Study of IrNi-Nanostructures for PEM Water Electrolysis - From RDE to Single-Cell TestingThursday (24.09.2020) 09:30 - 09:45 Z: Special Symposia I Part of:
The commercialization of the proton exchange membrane (PEM) electrolyzers suffers from the sluggish oxygen evolution reaction (OER) performance of the iridium catalyst and simultaneously requires the reduction of the applied metal loading. For this reason, iridium-based OER catalysts with high performance are attracting much interest; one promising option is the IrNi-nanostructure.[1-2]
This study investigated the commonly used electrochemical nickel-leaching pathway [3-5], synthesized IrNi-nanostructures, and tested their implementation possibility in single-cell applications. The impact of different initial nickel concentrations observed by rotational disk electrode (RDE) experiments disagrees with the tendency revealed by single-cell testing. We demonstrate that all IrNi-nanostructures used in single-cell applications lead to a significant performance drop with increasing current, which explained by the impact of nickel corrosion and dissolution. These results indicate that the well-reported electrochemical nickel-leaching pathway for initially high nickel contents is not suitable for the application in real PEM electrolysis cells. Further research must prove if this pathway is also not applicable to other iridium-based nanostructures, which are getting more and more attention.[6-7]
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