Behaviour of polyaniline electrodes in aqueous and organic solutions

✍ Scribed by T. Boschi; M.L. Di Vona; P. Tagliatesta; G. Pistoia

• Publisher: Elsevier Science
• Year: 1988
• Tongue: English
• Weight: 891 KB
• Volume: 24
• Category: Article
• ISSN: 0378-7753
• DOI: 10.1016/0378-7753(88)80114-9

✦ Synopsis

Polyanilme (PAn) has been obtained m ac:dm solutmns, chemmaUy (by oxldatmn w:th (NH4)2S2Os), and electrochemmally (by potentml scans between --0.2 and 0.8 V versus a saturated calomel electrode), m order to determine :ts smtabfl:ty as a cathode m rechargeable L: cells. It was ascertained that the loss of electrochemmal act:v:ty observed during the cyclm voltammetry expertments depends on such factors as nature of the electrolyte, upper potent:al hmlt, nature of the substrate, and presence of substltuents m the polyamlme rmgs.

The reductmn/ox:datmn processes of PAn are basmally the same m aqueous ac:dm solutmns and m L:+-contammg organm solutmns. The fully omchzed, anmn-doped form of PAn Is f:rst reduced to an emeraldme-hke, form, and the latter can be further reduced to an all-benzeno:d rings form. L:thmm cells based on PAn cathodes have been typmally subjected to 100 cycles w:th average capac:tms of 0.1 A h g-1 {based on the we:ght of PAn) h~troductlon The attention of groups revolved m the investigation of polymerm compounds for practmal applmatlon has recently turned to polyamhne. Thin materml has been shown to be su:table for a number of uses ranging from electrochromm displays [1], diodes and transistors [2], corrosmnresistant coatings for semmonductors [3], and cathodes for rechargeable L: batterms . Using polyamhne for such purposes ts made easmr by :ts outstanding stabfl:ty m mr and m many aqueous and nonaqueous solutions On the other hand, the basra aspects of react:ons govermng the polymerlzat:on process and the redox behavlour of polyanilme are still a semous