Abstract
Abstract Hydrogen evolution reaction on Ag was investigated in aqueous 1 M NaOH, LiOH, KOH and CsOH solution. A jump was found on the Tafel line in NaOH solution but not in LiOH, KOH and CsOH solutions, even after giving an anodic activation treatment to the electrode. The amount of deposited Na, K and Cs on Ag plate electrodes, polarized cathodically in respective solutions, was analysed by AES and XPS as a function of hydrogen overpotential. It was confirmed that Na was deposited on the Ag electrode and the coverage with Na was the cause of the jump on the Tafel line. The monolayer deposition was completed at about 0.8 V of hydrogen overpotential. Similarities were found between the deposition states in this work and those reported in the literature on the gas phase Na adsorption of Ag. On the other hand, no indication of analogous deposition was obtained for Li, K and Cs.
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