You might find this information in this article: http://journals.aps.org/pr/abstract/10.1103/PhysRev.131.2469

Thank you

I have done with the DFT study of Nickel , you may find it helpful.

The fermi energy which I got is 13.97 ev.

You can also find it in the file attached.

Just use ctrl+f  and typer Fermi energy

Thank you so much for your numerical result

I am looking for a publised work that states Ef of Nickel that confirms the above results (~13.97eV). Do you know anyone?

The Fermi level of Nickel measured from the Vacuum level is 5.01 eV. Do you want the Fermi level measured relative to the bottom of the conduction band edge then please you can calculate it by following the link:https://www.researchgate.net/post/What_is_the_value_of_Fermi_energy_of_elemental_Molybdenum

Best wishes