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- W769632164 abstract "Abstract O 2 concentration near Pt surface during oxygen reduction reaction (ORR) in 0.1 M HClO 4 has been monitored by rotating ring-disk electrodes system. At 0.8 V 2 concentration near Pt surface increases with potential accompanying with the decrease of ORR current at the disk electrode; O 2 concentration in the negative-going scan is larger than that at the same potential in the positive-going scan, while ORR current shows the opposite trend at ω > 400 rpm. At E > 0.8 V accumulation of O ad |OH ad at Pt disk electrode with ORR time is evident, revealing that O ad |OH ad formation rate is faster than that for the removal of OH ad to H 2 O under such conditions. At relatively lower rotation speed and faster scan rate, the cathodic current during ORR in the negative-going scan can be larger than that in the positive-going scan with a current peak at ca. 0.8 V, which is attributed to the superimposition of ORR current increase due to change of O 2 concentration near the surface and the additional reduction of O ad |OH ad formed from decomposed O 2 at higher potentials." @default.
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- W769632164 date "2015-09-01" @default.
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- W769632164 title "O 2 surface concentration change and its implication on oxygen reduction mechanism and kinetics at platinum in acidic media" @default.
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- W769632164 doi "https://doi.org/10.1016/j.elecom.2015.06.011" @default.
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