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Cylic Voltammetric Studies on the Electrode Reaction of Polyacetylene Secondary Cell
Author(s) -
Wang JengJong,
Chen ShouNan,
Chen YingChung
Publication year - 1989
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.198900070
Subject(s) - polyacetylene , chemistry , electrolyte , cyclic voltammetry , redox , propylene carbonate , electrochemistry , electrode , lithium (medication) , inorganic chemistry , polymer , organic chemistry , medicine , endocrinology
Cells of lithium / Polyacetylene containing 0.5 · 1.5 M LiClO 4 in propylene carbonate as supporting electrolyte are constructed. The mechanism for electrochemical redox process of polyacetylene is studied using cyclic voltammetry in the potential range from −0.8 to 0.2 volt vs. S.C.E. The electrode reactions are identified to be diffusion controlled. The difference of the peak potentials between the oxidation and reduction, ΔEp, is found to be a function of the scan time per cycle (τ sec/cycle) and is influenced by concentration of supporting electrolyte and isomeric structures of polyacetylene. However, there is a better reversible redox process of polyacetylene when the ClO 4 − ‐ ions diffuse successfully in and out of the Polymer film, which has the cis‐form structure, in concentrated supporting electrolyte solution and having a long scan time per cycle (τ). When the scan potential is extended to a more positive region, another peak is found, which may correspond to the irreversible chemical reaction caused by over‐doping. The over‐doping process is found to be controlled by the electrical field strength, concentration of the supporting electrolyte and isomerism of polyacetylene.