Define electrode potential and standard electrode potential

 Electrode Potential:

• The electrode potential, also known as the half-cell potential, is the electric potential of an electrode in an electrochemical cell relative to a standard reference electrode. 
• The standard reference electrode is usually the hydrogen electrode, which has a defined potential of 0.00 volts.
• The electrode potential of an electrode is a measure of its tendency to participate in an oxidation-reduction reaction. 
• An electrode with a positive potential is more likely to be oxidized, while an electrode with a negative potential is more likely to be reduced.

Standard Electrode Potential:

• The standard electrode potential is the potential of an electrode in an electrochemical cell relative to the standard hydrogen electrode (SHE) when both electrodes are in their standard states. 
• The standard state of an electrode is defined as its potential in a solution of 1 M concentration at a pressure of 1 atm and a temperature of 25°C.
• The standard electrode potential of an electrode is a measure of the Gibbs free energy change of the redox reaction taking place at the electrode. 
• A positive standard electrode potential indicates a spontaneous redox reaction, while a negative standard electrode potential indicates a non-spontaneous redox reaction.