Measurement of surface potential at silver chloride aqueous interface with single-crystal AgCl electrode

The surface potential at the silver chloride aqueous interface was measured by means of a single-crystal silver chloride electrode (SCr-AgCl). The measurements were conducted by titration of the KCl solution with AgNO3, and vice versa. The SCr-AgCl electrode potentials were converted to surface potentials ψ0ψ0 by setting zero at the point of zero charge at pCl = 5.2. The ψ0ψ0(pCl) function was linear, with a slope 12% lower with respect to the Nernst equation. It was demonstrated that the surface potential at the silver halide aqueous interface could be interpreted by means of the surface complexation model, originally developed for metal oxides.

The surface potential at the silver chloride aqueous interface was measured by means of a single-crystal silver chloride electrode. The ψ0ψ0(pCl) function was linear, with a slope 12% lower with respect to the Nernst equation.Figure optionsDownload as PowerPoint slide