Topic 3.5: Fast electron transfer kinetcs

Question 1

• How can we measure fast electron transfer kinetics?

Answer 1

• Small electrodes give reversible diffusion profiles that are diffusion controlled.

Question 2

• How does the CSV change at a macroelectrode with increasing k^o

Answer 2

Question 3

• How do ionic strength conditions affect the size of the DL and voltammetric response at a ME?

Answer 3

• Without background electrolyte, an increase in double layer size results in mass transfer being migration (as well as diffusion) controlled.
• Ions moving through DL will experience electrostatic effects.
• Resulting CSV has a smaller second wave as due to drop in ionic strength to make DL bigger and therefore higher migration contribution.