https://doi.org/10.1351/goldbook.D01726
Defined by the equation: \[\delta = \frac{D}{k_{\text{d}}}=\frac{n\ F\ D\ c\ A}{l_{i}}\] where \(D\) is the @[email protected], \(k_{\text{d}}\) is the @[email protected], \(F\) is the @[email protected], \(c\) is the concentration, \(A\) is the geometric area of the electrode, \(l_{i}\) is the @[email protected] and \(n\) is the @[email protected]