A new class of proton-conducting ionic plastic crystals based on organic cations and dihydrogen phosphate

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• 作者：Masahiro Yoshizawa-Fujita ; Kyoko Fujita ; Maria Forsyth ; Douglas R. MacFarlane
• 关键词：Solid acid ; Plastic crystal ; Ionic liquid ; Proton conductor ; Fuel cell
• 刊名：Electrochemistry Communications
• 出版年：2007
• 期刊代码：29_13882481
• 类别：ch
• 出版时间：May 2007
• 卷：9
• 期：5
• 页码：1202-1205
• 文件大小：149 K

摘要

Choline dihydrogen phosphate ([N_1.1.1.2OH]DHP) and 1-butyl-3-methylimidazolium dihydrogen phosphate ([C₄mim]DHP) were synthesized as a new class of proton-conducting ionic plastic crystals. Both [N_1.1.1.2OH]DHP and [C₄mim]DHP showed solid–solid phase transition(s) and showed a final entropy of fusion lower than 20 J K⁻¹ mol⁻¹ which is consistent with Timmerman’s criterion for molecular plastic crystals. The ionic conductivity of [N_1.1.1.2OH]DHP was in the range of 10⁻⁶ S cm⁻¹–10⁻³ S cm⁻¹ in the plastic crystalline phase. On the other hand, the ionic conductivity of [C₄mim]DHP showed about 10⁻⁵ S cm⁻¹ in the plastic crystalline phase. [N_1.1.1.2OH]DHP showed one order of magnitude higher ionic conductivity than [C₄mim]DHP in the temperature range where the plastic phase is stable.