If the standard iodine half-cell is chosen as the reference half-cell instead of the
hydrogen half-cell, then the cell potential for a silver–nickel cell is
The cell potential for a silver-nickel cell with the standard iodine half-cell as the reference is determined by subtracting the standard reduction potential of the nickel half-reaction from the standard reduction potential of the silver half-reaction.
The standard reduction potential for the silver half-reaction is +0.80 V, while the standard reduction potential for the nickel half-reaction is -0.25 V.
Therefore, the cell potential for the silver-nickel cell with the standard iodine half-cell as the reference is:
Cell potential = (Standard reduction potential of silver) - (Standard reduction potential of nickel)
= (+0.80 V) - (-0.25 V)
= +1.05 V