Hello all,
I am an undergraduate student major in Chemistry and freshman in electric chemistry, i am now reading a paper on ACS AC. i had a few question on explaining figure 4 and figure 5.
My understanding in figure 4 is:
It is a working curve diagram. The X-axis is the kinetic parameters, and the Y-axis is the ratio of kinetic and diffusion control currents.
Before the reaction has occurred, there is no irreversible reaction.
After the reaction occurs, since the forward reaction rate constant kf becomes larger, its maximum K value will also become larger, making the kinetic parameters smaller.
From the calculation formulas of kinetic peak current and diffusion control peak current, if the kinetic parameters of the denominator are smaller, the ratio of ik to id will become larger.If the dynamic parameter of the denominator is relatively large, the ratio of ik to id will be smaller.
My understanding in figure 5 is:
The X-axis of this figure is the log of the kinetic parameters, and the Y-axis is the half-peak potential. Regardless of whether the value of the following series of calculations is large or small, adding it will result in a gap between the potential scale of case 4 and case 3. The difference can be clearly seen from the figure. The size of the numbers on the horizontal axis represents the relative importance between chemical reaction rate constants and diffusion control in the system.
is there any misunderstood or any better explain for the two grapics?
thank you
the figures are from the paper below.
Article Theory of Stationary Electrode Polarography. Single Scan and...