Chemistry
In an Electrochemical half-cell, at the interface between the electrolyte (an ionic solution) and the metal electrode, the standard electric potential difference is;
where R = gas constant, T = temperature of solution, z = valency of the metal, e = elementary charge, NA = Avagadro's constant, and aM+z is the activity of the ions in solution. Quantities with superscript o denote the measurement is taken under standard conditions. The potential gradient is relatively abrupt, since there is an almost definite boundary between the metal and solution, hence the term interface.
Read more about this topic: Potential Gradient
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