Chronocoulometric measurements of capacitive charge in the presence of faradaic contributions

Chloride and iodide electrosorption on Ag(1 1 1)

“…[10] (see also [11,12]). Briefly, the applied potential E was first kept at a variable initial value E for a rest time long enough for adsorption equilibrium to be attained, and was then stepped to a fixed final value E f = 1.40 V/SCE, which was negative enough to cause a complete and almost instantaneous desorption.…”

Basic principles of voltammetry

“…lts extrapolation to t ~ tr enables the evaluation Of l A-lB· An improvement upon the chronocoulometric method described above represents the technique reported by Foresti et al [218]. According to their procedure the potential-step chronocoulometry has been shown to provide all quantitative information about the adsorption of organic surfactants which may be completely desorbed at experimentally accessible negative potentials.…”

Bromide Electrosorption on Liquid Gallium: A Typical Example of Halide Electrosorption from Aqueous Solutions and Its Modeling

“…Moreover, Ga and Hg differ notably in one of the main distinguishing feature of metals, namely, hydrophilicity. 33,34 Hence, there remains a continuing interest in comparative adsorption studies on Hg and Ga. [35][36][37][38][39][40][41][42][43][44][45][46] In the early work of the Russian school the adsorption on Ga of several anions, including bromide, was evaluated from interfacial tension or differential capacity measurements. [26][27][28]32 Only surface excesses Γ -,w relative to water were reported.…”

“…Subsequently, a special dropping gallium electrode set up in our laboratory, 36 used in combination with a computerized chronocoulometric technique for capacitive charge measurements, 36,39 permitted us to achieve more accurate results. It was therefore possible to verify the validity of the Gouy-Chapman theory at the interface between liquid Ga and aqueous solutions of the nonspecifically adsorbed NaClO 4 40 and Na 2 SO 4 45 salts.…”

“…Other reasons relate to the experimental difficulties associated with the handling of Ga. On the other hand, Ga is the only pure metal, beside Hg, that is liquid near room temperature and that, as such, allows a number of complications inherent in the use of solid metals to be avoided. Moreover, Ga and Hg differ notably in one of the main distinguishing feature of metals, namely, hydrophilicity. , Hence, there remains a continuing interest in comparative adsorption studies on Hg and Ga. − …”