I'm using carbon paper coated with a platinum catalyst (along with 50% by wt Nafion binder) as electrodes for hydrogen/oxygen evolution reactions. In 0.1M NaOH solution, at 2V a brown color appears and the catalyst leaches out from the carbon paper. What should I do?
As said by Artur Braun,
It is very crucial in the field of water electrolysis. Actually, carbon paper is not a good substrate electrode for OER in either acid or alkaline medium because of corrosion of carbon (corroded to CO2 and CO). Moreover, Pt/C is not also a better candidate for the OER, you can try nickel as anode material for alkaline water electrolysis. Depending on the carbon paper grade, the stability will.....Actually, the brown color denotes the dissolution of carbon I think, because Pt is highly stable in alkali as well as acid. So you just check the properties of carbon in the Pt, take Raman or XPS to confirm the structural properties. Also, take a ICPMS analysis to confirm the carbon leach out....
Hope this will help you
Thanks, Artur.
Thank you, Natarajan. I will try and find the origin of the color.
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