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The second point is that the Pt counter should be avoided especially when it can greatly contribute to your HER activity when it redeposits onto your anode.
This is the concern, not that the corrosion current from the counter could contribute.
Some people mistakenly use Pt counters (this is correct for instance if your working electrode is Pt, but again only under some circumstances).
Au is a much better choice, even though it also dissolves but it won't benefit the HER activity.
It is my feeling that the Ni foam cycling data shows that there is activation that occurs even on the Ni with cycling,
and that is most likely either from the Pt counter, or more likely from the transition metal impurities.
To strengthen the case for your process you need to somehow show that this is not the case.
And in the future, do not use Pt counters in alkaline solution, do a better job of cleaning the KOH.
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