### Randles–Sevcik Equation

Last Updated: 5/7/19 by Tim Paschkewitz

##### ARTICLE TAGS
• equation,
• peak current,
• Randles,
• Randles-Sevcik,
• Sevcik

### 1Randles-Sevcik Equation

There are many resources that describe the detailed background, derivation, and applications of this equation.   Here, we present just a snippet to get you started.

In a potential sweep experiment (e.g., LSV or CV ), the peak current $i_i$ follows the Randles-Sevcik equation,

$\displaystyle i_p=0.4463{\left(\frac{F^3}{RT}\right)}^{1/2}n^{3/2}AD_O^{1/2}C_O^*\nu^{1/2}$

At 25°C, for an electrode with surface area $A$, for a solution whose electrochemical redox pair of concentration $C_O^*$ has a diffusion coefficient $D_O$, was swept in an LSV or CV experiment at sweep rate $\nu$, $i_p$ is

$\displaystyle i_p=(2.69\times 10^5)n^{3/2}AD_O^{1/2}C_O^*{\nu}^1/2$

### 2References

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