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The more positive is V-onset ,the more active is the catalyst. V-onset is definded as the potential at which the ORR current is 5% of the measured at -0.3V,considering that the diffusion-limited current is parctically reached at that potential for all catalysts discussed in this work.
ÎÄÕ±êÌ⣺Does CO poison Fe-based catalysts for ORR?
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