Electrode Potential vs. Cell Potential: Key Differences Explained
Electrode Potential is the voltage of a single half-cell compared to the standard hydrogen electrode, while Cell Potential is the total voltage between two half-cells when they’re connected in a complete electrochemical cell.
People mix them up because both are measured in volts and appear on the same data sheet. In practice, students plug half-cell values into Nernst equations and forget that Cell Potential is the algebraic sum of two distinct Electrode Potentials, not a standalone figure.
Key Differences
Electrode Potential refers to one electrode only, referenced against the standard hydrogen electrode. Cell Potential combines two such potentials—one oxidation, one reduction—into a single net value. Electrode Potential can be positive or negative; Cell Potential is always the difference between them.
Examples and Daily Life
A lithium-ion battery’s anode has an Electrode Potential of –3.05 V, while the cathode sits at +0.34 V. The resulting Cell Potential of 3.39 V is what powers your smartphone. Mixing the two would give you useless numbers and a dead battery.
Can Electrode Potential ever be zero?
Yes, the standard hydrogen electrode is defined as 0.00 V, serving as the universal reference point.
Does temperature affect both equally?
Temperature shifts both, but Cell Potential changes more because it compounds the temperature dependence of two half-cells.