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Investigation of phosphate species adsorption/desorption processes wasperformed on Ag(100) and Ag(111) electrodes in H$_{3}$PO$_{4}$,KH$_{2}$PO$_{4}$ and K$_{3}$PO$_{4}$ solutions by Current-Potential ($j-V$)profiles and Electrochemical Impedance Spectroscopy ($EIS$). We used theequivalent circuit method to fit the impedance spectra. Different electricalequivalent circuits ($EECs$) were employed depending on the potential regionthat was analyzed. For potentials more negative than the onset of the hydrogenevolution reaction ($her$), a charge transfer resistance (R$_{ct}$) in parallelto the $(RC)$ branches was included. Peaks from $j-V$ profiles were integratedto estimate surface coverage. A reversible process was observed forAg(hkl)/KH$_{2}$PO$_{4}$ systems, where a value of 0.07 ML was obtained. ForAg(111)/H$_{3}$PO$_{4}$, a coverage of about 0.024 ML was calculated fromanodic/cathodic $j-V$ profiles, whereas for Ag(hkl)/K$_{3}$PO$_{4}$ systemsdifferent values were obtained from integration of anodic/cathodic peaks due tohighly irreversible processes were observed. In the case ofAg(hkl)/K$_{3}$PO$_{4}$, the capacitance (C$_{(\phi)}$) plots are welldifferentiated for the two faces, and co-adsorption of OH$^{-}$ was evaluatedfrom resistance parameters. Characteristic face-specific relaxation times areobtained for each electrode. In addition, it was found that the onset potentialof $her$ for Ag(111) at pH=1.60 was about 100 mV more negative compare toAg(100).

applied surface science advances

Specific adsorption of phosphate species on Ag (111) and Ag (100)  electrodes and their effect at low overpotentials of the hydrogen evolution  reaction