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EXPERIMENT 5. CYCLIC VOLTAMMETRY - Michigan State …

-1- EXPERIMENT 5. CYCLIC VOLTAMMETRYO bjectives1. To determine the capacitance of electrochemical To determine the formal potential and diffusion coefficient of Fe(CN) To use CYCLIC VOLTAMMETRY to understand the electrochemistry of Co(NH3)63+.4. To investigate the effects of electrode contamination on CYCLIC Reactions and Electrode CapacitanceFigure 1 describes the process that occurs in simpleelectrode reactions. In the case of reduction, a species (O)capable of receiving an electron from the electrode diffusesto the surface, receives an electron and diffuses away fromthe surface. Current at the surface is generated by thetransfer of electrons from the electrode to the redoxspecies. In solution current is carried by migration of already studied this in your measurements can ask whether a current can occur if there isno species in the solution that can transfer electrons to thesurface at the potential of interest.

and J is the flux of the oxidized species to that surface. The flux is governed by Fick’s law: where, D is the diffusion coefficient of the species, x is the distance from the electrode surface, (dC/dx) x=0 is the concentration gradient at the surface, C* is the concentration of the oxidized species in the bulk solution, and C

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