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- W2912608450 abstract "Oxygen reduction reaction (ORR) activities and H2O2 production rates at Pt-Fe, Pt-Co, and Pt-Ni alloy electrocatalysts in 0.1 M HClO4 solution were determined with channel flow double electrodes (CFDEs) between 20°C and 90°C. Below 60°C, the apparent rate constants kapp for ORR at these electrodes were 2.4–4.0 fold higher than that at a pure Pt electrode, whereas their apparent activation energies of 41 kJ mol−1 at the overpotential η = − 0.525 V (0.760 V vs. RHE at 30°C) were comparable to that at the pure Pt electrode. The enhanced activity could be ascribed to an increased O2 coverage on Pt skin-layer (< a few nm in thickness) formed on these alloy catalyst surfaces. Small H2O2 production at the alloy electrodes corresponding to yields of 0.17–1.2% was detected. The ORR activities at the alloy electrodes were degraded above 60°C due to dissolution of non-precious metal components from the alloy phases, which thickens a Pt skin layer originally formed at the room temperature, and the production of H2O2 ceased." @default.
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- W2912608450 date "2004-01-01" @default.
- W2912608450 modified "2023-09-25" @default.
- W2912608450 title "Temperature-Dependence of Oxygen Reduction Reaction Activity at Platinum Alloy Electrocatalysts" @default.
- W2912608450 doi "https://doi.org/10.1149/200421.0124pv" @default.
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