Abstract
The adsorption of hydrogen atoms on a polycrystalline Pt electrode was examined in acid by surface-enhanced infrared (IR) spectroscopy, and the IR data was quantitatively compared with the kinetics of hydrogen evolution reaction (HER). The Pt–H stretching vibration was observed around 2100 cm −1 in the H 2 evolution potential range ( E < 0.1 V vs. RHE). The current of HER was proportional to the square of the band intensity at 0.02 < E < 0.1 V, from which it was concluded that the adsorbed hydrogen atom is the reaction intermediate of HER and the combination of two adsorbed hydrogen atoms is rate-determining. At E < 0.02 V, on the other hand, an inconsistency was found between the IR and electrochemical measurements due to the supersaturation of H 2 at the interface.
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