Differential Capacity of Stainless Steel in Potassium Chloride Solutions During Potentiostatic And Galvanostatic Polarization
Differential Capacity of Stainless Steel in Potassium Chloride Solutions During Potentiostatic And Galvanostatic Polarization
Fiorino, M. Elaine Curley
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As the potential is shifted positive past the reversible potential, oxidation of the absorbed hydrogen atoms from the metal will occur, causing an increase in the capacity value measured. The accumulation of the resulting hydronium ion at the interface will cause a decrease in pH and a produce a positive shift in the reversible potential of the reaction. If the interfacial pH becomes low enough, hydrogen evolution will again become energetically feasible. The interfacial pH necessary to allow h...ydronium ion reduction in the potential range of the cathodic loop (-0.30 to 0.0 V) is calculated from equation 7 as 0.91 to - 4-. 10. If it is assumed that all of the hydrogen produced at -0.700 V ( ,^.2.4 coul) is absorbed by the stainless steel and then emitted into an approximately . 100 A double layer, an interfacial pH of -4.1 is calculated. Since only a fraction of the hydrogen produced is expected to be absorbed, this is obviously an approximation. With the present data it is not possible to make the distinction between one broad capacity peak or two separate, narrower peaks in the active-passive transition region.
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