Digital simulation in a thin layer spectroelectrochemical cell with minigrid platinum electrode by microregion approximation explicit finite difference method

The microregion approximation explicit finite difference method is used to simulate cyclic voltammetry of an electrochemical reversible system in a th ree-dimensional thin layer cell with minigrid platinum electrode. The simul ated CV curve and potential scan-absorbance curve were in very good accorda nce with the experimental results, which differed from those at a plate ele ctrode. The influences of sweep rate, thickness of the thin layer, and mesh size on the peak current and peak separation were also studied by numerica l analysis, which give some instruction for choosing experimental condition s or designing a thin layer cell. The critical ratio (1.33) of the diffusio n path inside the mesh hole and across the thin layer was also obtained. If the ratio is greater than 1.33 by means of reducing the thickness of a thi n layer, the electrochemical property will be far away from the thin layer property.