Structural changes at the interface between polycrystalline Ag and electrolyte solutions containing surfactants as probe molecules

Anastopoulos, A.; Paschalidou, M.; Papoutsis, A.

doi:10.1016/j.jelechem.2014.03.009

Cited by 1 publication

(1 citation statement)

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“…Due to their inhibitory action, organophosphorus compounds may be proved to act as effective corrosion inhibitors. Among them, triphenylphosphine oxide and triphenylarsine oxide were frequently used as reaction inhibitors [11] and also as probes of Hg/solution [12,13] and Ag/ solution interface [14], while other alkyl substituted phosphinoxides [11], phosphines, arsines [15], and phosphonium salts [16,17] have received less attention.…”

Section: Introductionmentioning

confidence: 99%

Differential capacitance and electrochemical impedance study of surfactant adsorption on polycrystalline Ni electrode

Anastopoulos

Papoutsis

Papaderakis

2015

J Solid State Electrochem

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The adsorption of neutral organophosphorous compounds on a charged polycrystalline Ni electrode is studied by differential capacitance and impedance measurements in methanol solutions. Analysis of capacitance measurements reveals that tributylphosphine oxide, tri(n)octylphosphine oxide, and triphenylphosphine follow Langmuir adsorption isotherm. Saturation capacitance C sat , potential of maximum adsorption E max , limiting surface concentration Γ max , and standard Gibbs energy of adsorption ΔG max o at E max are determined. The cathodic reduction of (NiOCH 3 ) ads film formed on Ni surface at positive potentials, introducing a faradaic contribution in addition to the electrostatic charging of the interface, is supported by linear sweep voltammetric and impedance measurements. High values of electrode coverage and strong depression of faradaic currents are attained, indicating that these adsorbates may be suitable as corrosion inhibitors.

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