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SHE (standard hydrogen electrode): potential of a platinum electrode in a theoretical ideal solution (the current standard for zero potential for all temperatures) RHE ( reversible hydrogen electrode ): a practical hydrogen electrode whose potential depends on the pH of the solution
Common reference electrodes and potential with respect to the standard hydrogen electrode (SHE): Standard hydrogen electrode (SHE) (E = 0.000 V) activity of H + = 1 Molar; Normal hydrogen electrode (NHE) (E ≈ 0.000 V) concentration H + = 1 Molar; Reversible hydrogen electrode (RHE) (E = 0.000 V - 0.0591 × pH) at 25 °C
A reversible hydrogen electrode (RHE) is a reference electrode, more specifically a subtype of the standard hydrogen electrodes, for electrochemical processes. Unlike the standard hydrogen electrode, its measured potential does change with the pH , so it can be directly used in the electrolyte.
The data below tabulates standard electrode potentials (E°), in volts relative to the standard hydrogen electrode (SHE), at: Temperature 298.15 K (25.00 °C; 77.00 °F); Effective concentration (activity) 1 mol/L for each aqueous or amalgamated (mercury-alloyed) species; Unit activity for each solvent and pure solid or liquid species; and
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This gives the SCE a potential of +0.248 V vs. SHE at 20 °C and +0.244 V vs. SHE at 25 °C, [1] but slightly higher when the chloride solution is less than saturated. For example, a 3.5M KCl electrolyte solution has an increased reference potential of +0.250 V vs. SHE at 25°C while a 1 M solution has a +0.283 V potential at the same temperature.