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Here is a sketch of the Pourbaix diagram for manganese. Click "Next" to see how this can be used to form the Tafel plot.

In this region of the Pourbaix diagram, the metal is stable relative to its ions in solution and so metal ions would be deposited on the metal - the metal acts as a cathode. This gives the cathodic branch of the Tafel plot.
× E / V (SHE) 2.0 1.6 1.2 0.8 0.4 0 -0.4 -0.8 -1.2 -1.6 -2.0 0 2 4 6 8 10 12 14 pH Mn2+ MnO4- MnO2 Mn(OH)2 Mn MnO42- Mn3O4 Mn2O3 Mn(OH)3 log (i /arb units) 3 2 1 0 -1 -2 -3 -2.0 -1.2 -0.4 0 0.4 1.2 2.0 E / V (SHE) Sorry, your browser does not support inline SVG.