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Document Description
TitleIon transport in conducting polymers
AuthorLi, Guangchun, 1964-
DescriptionThesis (M.Sc.)--Memorial University of Newfoundland, 2000. Chemistry
Paginationxii, 100 leaves : ill.
SubjectConducting polymers; Ions--Migration and velocity
Degree GrantorMemorial University of Newfoundland. Dept. of Chemistry
NotesIncludes bibliographical references
AbstractThe ion transport properties and electrochemistry of chemically prepared polypyrrole/poly(styrene-4-sulfonate), poIy(3, 4-ethyIenedioxythiophene)/poly(styrene-4- sulfonate), and electrochemically prepared poly(3, 4-ethylenedioxythiophene)/poly(styrene- 4-sulfonate) composites have been investigated by cyclic voltammetry and impedance spectroscopy in a variety of electrolyte solutions. These polymers exhibited facile electrochemistry, fast ion transport, and good electrochemical stability. The chemically prepared polymers are approximately ten times more porous than their electrochemically prepared counterparts, and therefore have ionic conductivities that are higher by a similar factor and show less potential dependence. The ionic conductivities of these polymers are strongly dependent on the concentrations and conductivities of the electrolyte solution used. At low electrolyte concentrations, the ionic conductivities of these polymers also show some potential dependence. It is concluded that these polymers consist of permselective polymer phases containing incorporated counter- ions and pores containing the electrolyte solution. The incorporated ions account for the dependence of ionic conductivity on the applied potential and the polymer's intrinsic ionic conductivity, while the electrolyte solution in the pores explains the strong dependence of ionic conductivity on the solution concentration and conductivity. In high concentration electrolyte solutions, ion transport is dominated by electrolyte in the pores, while at low electrolyte concentrations, incorporated ions in the polymer phases become significant.
Resource TypeElectronic thesis or dissertation
FormatImage/jpeg; Application/pdf
SourcePaper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries
Local Identifiera1393971
RightsThe author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission.
CollectionElectronic Theses and Dissertations
Scanning StatusCompleted
PDF File(10.07 MB) --
CONTENTdm file name66644.cpd