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The current density j (mA⋅cm–2) in function of the electrode potential (V) according to the Butler–Volmer Equation (Equation 2) for (A) different values of the H2 evolution onset potential E(H+/H2); (with j0 = 1⋅10–7 mA⋅cm–2) and (B) different values of the exchange current density j0 (with E(H+/H2) = −0.414V). The transfer coefficient α was set to 0.5. The inflection point of the curves represents E(H+/H2).
