The EMF of the cell $\mathrm{Ni}\left|{\mathrm{Ni}}^{2+}\right|\left|{\mathrm{Cu}}^{2+}\right|\mathrm{Cu}\left(\mathrm{s}\right)$  is 0.59 volt. The standard reduction electrode potential of copper electrode is 0.34 volt. The standard reduction electrode potential of nickel electrode will be