Reversible redox reactions: The ruthenium on Pt–Ru/C electrocatalysts shows a reversible transformation (see figure), between RuO2 and Ru, during repetitive reductions (by hydrogen at Tr=620 K) and oxidations (by air at To=520 K). Electroactivity significantly increases after the oxidation treatment due to the formation of closely contacted domains between c-RuO2 and Pt.
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Huang et al. (2007) studied this question.
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