Page 74 - Analytical Electrochemistry 2d Ed - Jospeh Wang

QUESTIONS 59

6. Describe clearly how thin-layer spectroelectrochemistry is used for measuring
the values of E and n.

7. Summarize the different features of the cyclic voltammogramic response for
reversible and quasi-reversible systems.
8. Explain the use of cyclic voltammetry for estimating the values of E and n for a

reversible system.
9. What is the reason for the gradual increase of the cathodic and anodic cyclic-
voltammetric peak currents observed upon repetitive scanning?

10. How would you use EQCM for elucidating the electrostatic desorption of
anionic DNA molecules from gold electrodes?
11. Propose a SECM experiment for mapping the distribution of an oxidase enzyme
within a carbon composite surface. (Note that the enzyme generates hydrogen
peroxide in the presence of its substrate and oxygen.)

12. How does the increase of the scan rate affect the ratio of peak currents
(backward=forward) in a cyclic voltammetric experiment involving a redox
process followed by a chemical reaction?