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|Title:||Electrochemical degradation of polyaniline in HClO4 and H2SO4||Authors:||Zhang, A.Q.
|Issue Date:||Jun-1995||Citation:||Zhang, A.Q.,Cui, C.Q.,Lee, J.Y. (1995-06). Electrochemical degradation of polyaniline in HClO4 and H2SO4. Synthetic Metals 72 (3) : 217-223. ScholarBank@NUS Repository.||Abstract:||The ratio of the sum of the second and third anodic current peaks to the first anodic current peak, (Ip,B1 + Ip,B2) Ip,A, in the cyclic voltammogram of polyaniline in H2SO4, was used to measure the extent of polymer degradation that occurs during electropolymerization. Structural determination by UV-Vis spectroscopy and morphology examination by scanning electron microscopy verified that a large ratio is indicative of a more extensive degradation. The ratio was found to vary with the number of deposition cycles. It decreased initially to a minimum and then increased to a steady state value. It is postulated that the initial decline was caused by a transition in the reaction mechanism for radical-cation generation, whereas the increase after the minimum was caused by ion-pair formation between sulfate anions and the polymer chains. Mass transfer limitation eventually set in, leading to the saturation of the ratio at the steady state value. © 1995.||Source Title:||Synthetic Metals||URI:||http://scholarbank.nus.edu.sg/handle/10635/91465||ISSN:||03796779|
|Appears in Collections:||Staff Publications|
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