Changing the Electrode Geometry Macro to Micro

At a macroelectrode, electrolysis of A occurs across the entire electrode surface such that the diffusion of A to the electrode or B from the electrode surface is termed planar, and the current response is typically described as diffusion 

For a reversible electrode reaction at a microelectrode, as shown in Fig. 2.15b, where Ej/2 is the half-wave potential, the following equation describes the expected voltammetric shape  

When a plot of E against is constructed, a linear response should be 

To determine between reversible, quasi-reversible and irreversible, a useful approach is the Tomes criteria [7] see Ref. [6] for a full overview of the various diagnostic approaches. 

18 shows the different microelectrode geometries that can be readily encountered in electrochemistry. For an elegant overview of microelectrodes and their benefits and applications, readers are directed to Ref [7]. 

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