A series of dual conducting polymer based type I supercapacitors were constructed using poly͑3,4-propylenedioxythiophene͒ and poly͑3,4-ethylenedioxythiophene͒ as electrode couples. The switching speeds and cycle lifetimes of these supercapacitors were compared using two types of supporting electrolytes; lithium bis͑trifluoromethanesulfonyl͒imide and 1-ethyl-3-methyl-1-Himidazolium bis͑trifluoromethanesulfonyl͒imide ͑a room temperature molten salt͒. The results indicate that supercapacitors using 1-ethyl-3-methyl-1-H-imidazolium bis͑trifluoromethanesulfonyl͒imide as the supporting electrolyte have cycle lifetimes superior to supercapacitors using lithium bis͑trifluoromethanesulfonyl͒imide as the supporting electrolyte.

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Two new types of p‐xylene bis‐sulfonium chloride monomers were prepared from cycloalkylene sulfides. The polymerization characteristics of these monomers to form poly(p‐xylene sulfonium chlorides), and the thermal elimination reactions of their polymers to poly(p‐phenylene vinylene), were compared with those of two monomers prepared from dialkyl sulfides. The cycloalkylene sulfonium chloride monomer polymerized to higher yields and to higher molecular weight polymers, which showed more efficient elimination reactions.

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