A popular criterion that uses the ratio between the peak currents of the respective positive (anodic) and negative (cathodic) potential scans, If/Ib, in the cyclic voltammetry of methanol electro-oxidation to gauge CO-tolerance and catalytic activity of Pt-based electro-catalysts was revisited and its inadequacy was revealed by an in situ surface enhanced IR study.
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Hofstead-Duffy et al. (2012) studied this question.
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