Standard Reduction Potential Definition

Definition: The standard reduction potential is the potential in volts generated by a reduction half-reaction compared to the standard hydrogen electrode at 25 °C, 1 atm and a concentration of 1 M.

Standard reduction potentials are denoted by the variable E0.

Examples: The reduction of water:

2 H2O + 2 e- → H2 + 2 OH-

has a E0 = 1.776 V