Potentiels de charge nulle d'electrodes monocristallines de cuivre d'orientation (111) et (100) au contact de solutions aqueuses de perchlorate de potassium

Potential of zero charge of monocrystalline copper electrodes in perchlorate solutions

“…It should be emphasized that the pzc value ()0.72 V vs SHE) for Cu (1 1 0) [12]. However, our pzc values for other copper faces are more negative than those given in the literature [9,10,12]. The sequence of pzc values for Cu monocrystalline electrodes for each pH studied is the same and is as follows: Cu (1 1 0) < Cu (1 0 0) %Cu (poly) < Cu (1 1 1).…”

“…These data are approximate, since they were estimated by comparing the adsorption behaviour of tetrabutylammonium ion on single crystal copper electrodes with that on Hg and Zn [0 0 0 1]. Similar values were reported by Lecour and Bellier [10]. The measurements were performed in acidic media to prevent surface oxidation.…”

“…Koga et al [13] found a correlation of the pzc of Cu single electrodes with the charge transfer of adsorbed anion displacement during the adsorption of CO. Earlier data on the pzc of single crystal Cu electrodes were reported in [1,[4][5][6][7][8][9][10][11][12][13][14].…”

Open circuit stability of underpotentially deposited Pb monolayer on Cu(111)

“…This slightly higher charge could be attributed to the potentially dependent contraction for Pb UPD layer on Cu(1 1 1) [23] that results in up to 3.2% (at lowest underpotentials) laterally compressed adsorbate with respect to its bulk counterpart [23]. Another source for excess charge could also be the difference in the pzc-s of Pb(1 1 1) (À1.210 V (MSE) [35]) and Cu(1 1 1) (À0.850 V (MSE) [36]) which, according to a detailed analysis made for the system Cd/Pt(1 1 1) [37], could generate double layer charge upon plating/ stripping of UPD layer. In situ STM monitoring was performed at characteristic UPD potentials (STM insets in Fig.…”

In Situ Video‐STM Studies of Adsorbate Dynamics at Electrochemical Interfaces

“…First, the most appropriate reference point for a quantitative comparison of surface diffusion in elec- trochemical environment with that under UHV conditions should be the potential of zero charge, which is several hundred millivolts more negative than the potential range studied herein (the pzc in weakly specifically adsorbing KClO 4 is reported as À0.79 V SCE [19] ). Extrapolating the data in Figure 4 to this potential regime the surface mobility should be higher by several orders of magnitude.…”