In the diffusion-controlled process, peak currents are linearly proportional to the square root of the scan rate. In surface controlled (also known as an adsorption-controlled) process, peak currents are linearly proportional to scan rate. Wha is the physical meaning behind this explanation?
Thanks.
both processes (whether diffusion or adsorption) are scan rate dependant. in case of diffusion, it states that the number of particles diffuses through a cross-sectional unit area which is proportional to concentration differences across the area, while in case of the adsorption process electroactive species migrate from bulk phase to interface, and by plotting a graph log of scan rate versus the log of current if you will get slope values between 0.5 or 1 then 0.5 is supposed to be diffusion and 1 for surface adsorption. for more details, you can read cyclic voltammetry ' simulations and analysis of reaction mechanisms by David K.Gosser.
a graph log of scan rate versus the log of current if we get slope values 0.27, then process will be?
- Badges
- Science topic
- Similar topics
- Physical Sciences
- Materials Science