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It is often much more convenient to use alternative electrodes whose potentials are precisely known with respect to the SHE Two of the electrodes most commonly used for this purpose are the Ag/AgCl electrode, //AgCl(s),Cl-/Ag(c) at E0 = +0.2224 V vs. SHE, and the saturated calomel electrode (SCE) at 0.241 V vs. SHE The effect of changing the reference electrode is to change the zero of a potential scale while leaving the relative positions of all of the potentials unchanged.
first calculating the energy at a function of temperature for all chemical species involved
then using Nernst equation to adjust for non standard activities or concentrations
