Behavior as a function of electrode size

The previons simnlation has allowed us to determine the variation of the coverage degree 0 at the level of the electrodes as a function of the experimental conditions and the nature of the metal. This simulation has been conducted with the results observed on the sensors whose electrodes are of the same size but different natures. As was seen in Chapter 8, the use of two electrodes which have the same nature but different sizes can cause a potential difference between these electrodes. This potential difference is expressed by  

Knowing 0, at different temperatures and different pressures, then allows us to express the potential difference as a function of the radius of the two electrodes and to check the validity of the previous relation by comparing the corresponding experimental results. 

Before displaying the simulation results of such a phenomenon, we recall that the potential of each electrode is inversely proportional to its size thus, the electrode which has the greatest size has the lowest potential. Cormected to the positive pole of the measuring device, the response will be negative. 

Finally, the potential difference AV between the electrodes will be all the greater if the difference in size is substantial. 

Knowing 0au and 0r, at different temperatures and different pressures, allows us to calculate AV for two identical electrodes, either in gold or platinum, and thus as a fimction of the ratio p = R I 1. AV is then proportional to 0.  

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