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Randles–Sevcik Equation

Last Updated: 5/7/19 by Tim Paschkewitz

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  • Randles,
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  • peak current,
  • equation
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  1. Randles-Sevcik Equation
  2. References

1Randles-Sevcik Equation

In a potential sweep experiment (e.g., LSV Linear Sweep Voltammetry (LSV) or CV Cyclic Voltammetry (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
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