Mm. Davila et al., Study of the composite electrodes carbon-polyvinyl chloride and carbon-polyvinyl chloride/Nafion by ex situ and in situ methods, ELECTR ACT, 46(20-21), 2001, pp. 3189-3197
The electrochemical response of the composite electrodes carbon-polyvinyl c
hloride and carbon-polyvinyl chloride/Nafion was studied in various aqueous
electrolytes. Ex situ studies using AFM, SEM and EDS showed that after pro
longed electrochemical pretreatment by repetitive potential cycling between
- 0.3 and 1.3 V in 0.1 M H2SO4, changes occur to the surface composition,
topography and morphology of the electrodes. In situ studies with electroch
emical techniques using electrodes pretreated with carbon-polyvinyl chlorid
e and modified with ruthenium-phenanthroline complex exhibited electrochemi
cal activity for redox systems, as well as selectivity in the determination
of dopamine in a solution containing excess ascorbic acid. (C) 2001 Elsevi
er Science Ltd. All rights reserved.