Quantitative in situ measurement of ion transport in polypyrrole/poly(styrenesulfonate) films using rotating ring-disk voltammetry

Analytical Chemistry

Volumn 71, Issue 17, 1999, Pages 3677-3683

  Salzer, Corey A ^a   Elliott, C Michael ^a   Hendrickson, Susan M ^b  

^a Department of Environmental and Radiological Health Sciences   (United States)

^b DAVIDSON COLLEGE   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

CATION; ELECTROLYTE; POLYPYRROLE; POLYSTYRENE DERIVATIVE;

ARTICLE; CYCLIC POTENTIOMETRY; ELECTROCHEMISTRY; FILM; ION TRANSPORT; MEASUREMENT; OXIDATION REDUCTION REACTION;

EID: 0033198646     PISSN: 00032700     EISSN: None     Source Type: Journal    
DOI: 10.1021/ac990139w     Document Type: Article

References (21)

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16. It is important to emphasize that the ring potential be chosen such that it is well onto the limiting current plateau of the cation reduction so that small variations in potential from iR drop do not effect the ring current.
17. r′ do depend on the polymer thickness and the potential scan rate, v. At fast scan rates, a collection of problems can arise from iR drop, from ion/electron transport rates within the polymer film, and from maintaining insufficient flux of dopant ions from solution to the polymer interface (see text). A scan rate of 50 mV/s was determined to be an optimum compromise and was used in all of the studies reported here unless otherwise noted.
18. Elliott, C. M.; Kopelove, A. B.; Albery, W. J.; Chen, Z. J. Phys. Chem. 1991, 95, 1743.
19. 2/3 is experimentally the ratio of the independently determined ring and disk currents measured from the mass-transport-limited oxidation or reduction of some arbitrary solution species. Since the limiting currents at either electrode are proportional to the flux of species to the respective surface, knowing the limiting flux at one electrode and β, the flux at the other electrode can be calculated.
20. + under flux-limited conditions, the small absolute and relative concentrations of the minor component make such studies virtually impossible because of the poor overall signal-to-noise ratio. Nonetheless, the dependence is qualitatively obvious.
21. + measurements were done with Biograf by BioDesign, Inc., Version 2.2.