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Carbon monoxide adsorption on Pt/Pt electrodes modified with silver adatoms

“…However, the fact that the obtained n 1 value is quite reasonable supports the assumption on the substantial two-dimensional aggregation of silver adatoms. Moreover, it should be reminded that CO molecules and copper atoms (in equal amounts) coadsorbed on Pt within a monolayer are electrodesorbed in a single peak [10], which agrees with the uniform (regular) distribution of Cu ad over the platinum surface [33].…”

“…However, it was found [9] and later confirmed [10] that up to 50% of the copper monolayer is removed from platinum electrodeposits during CO adsorption. The same effect was observed for iridium electrodeposits [11]. For palladium electrodeposits, UPD copper was removed virtually completely [12].…”

“…For palladium electrodeposits, UPD copper was removed virtually completely [12]. Changes in the CO ads 1 monolayer on a platinum electrode when the latter is brought into contact with a sulfuric-acid solution of Cu 2+ were observed [10]. In [13], by analyzing transients of current at a constant potential during CO adsorption from a 10 -3 M CdSO 4 + 0.5 M H 2 SO 4 solution, it was concluded that adsorbed Cd atoms are displaced by adsorbed CO species from the surface of platinum single crystals.…”

Specific Features of the Adsorption of Carbon Monoxide on a Smooth Polycrystalline Platinum Electrode Modified with Adsorbed Silver Atoms

“…At identical coverages of the electrode surface by Ag ad , the probability that CO would undergo adsorption in the bridging form, which demands that two vacant platinum atoms be present next to one another, is greater when the silver adsorption is of an "islet" character. In connection with this, we deem it possible to mention that in the presence of copper adatoms, which are sufficiently uniformly distributed over the platinum surface [31], carbon monoxide is adsorbed in a linear form [32].…”

Coadsorption of carbon monoxide and copper atoms on rhodium electroplates

“…Later this interesting phenomenon was studied on electrolytic deposits (e. d.) of Pt [3], Pd [2], and Ir [4] and also in the presence of copper adatoms (Cu ad ) 1 . For a Pt/Pt electrode, in agreement with [1], it was found that copper adatoms are partially displaced (~50% of the initial monolayer) by carbon monoxide: a similar effect was also observed for e. d. Ir [4]. At the same time, for e. d. Pd, virtually total displacement of preadsorbed copper atoms by carbon monoxide was observed [2].…”