The one with the greatest reduction potential will be what you want to choose as the half reduction response and then be your cathode. The one with the least reduction potential will be what you want to choose as the half oxidation response and then be your anode.

In a cell there is an electrode cathode potential and an anode electrode potential. The difference between the two electrode powers is equal to the potential of Ecatodo Eanodo Ecell electrode.

The anode is negative in electrochemical cells because it has a negative potential for the solution, while the anode is positive in electrolytic cells because it is connected to the positive battery terminal.

If you see that the reduction of galvanic cells occurs in the left electrode, then the left is the cathode. The oxidation occurs in the right electrode, then the right is the anode. While in the reduction of electrolytic cells occurs in the right electrode, then the right is the cathode.

Anode definition. 1 electrode of an electrochemical cell in which oxidation occurs as in the positive terminal of an electrolytic cell.