Effect of Electrolytes on Redox Reactivity of Polypyrrole

✍ Scribed by D. Y. Kim; J. K. Kim; J. Y. Lee; H. W. Rhee; C. Y. Kim

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 258 KB
• Volume: 8
• Category: Article
• ISSN: 1042-7147
• DOI: 10.1002/(sici)1099-1581(199704)8:4<184::aid-pat632>3.0.co;2-9

✦ Synopsis

Doping and dedoping characteristics of polypyrrole (PPy) formed electrochemically have been examined by means of energy-dispersive X-ray spectroscopy (EDS). Dodecylsulfate ions (DS Ϫ ) and perchlorate ions (ClO Ϫ

4 ) were embedded simultaneously in PPy when both ions were present on the polymerization of pyrrole. Sequential formation of PPy in the single dopant system allowed PPy/ClO 4 to grow in the bulk of PPy/DS but not vice versa. DS Ϫ was embedded not to leave the polymer on reduction but ClO Ϫ 4 moved in and out of the polymer on redox reaction. Cyclic voltammetry was employed to determine the redox reactivity of PPy in different electrolyte systems. NaClO 4 was a better electrolyte for cyclic redox reaction than LiClO 4 or KClO 4 . NaCl was a good electrolyte for cyclic redox reaction but Cl Ϫ failed to penetrate in the PPy/DS bulk on reoxidation. The cyclic redox reactivity lasted longest when PPy/DS was redoxcycled sequentially in the NaCl electrolyte system and then in the NaClO 4 system.