A new class of proton-conducting ionic plastic crystals based on organic cations and dihydrogen phosphate
Data(s) |
01/01/2007
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Resumo |
Choline dihydrogen phosphate ([N<sub>1.1.1.2OH</sub>]DHP) and 1-butyl-3-methylimidazolium dihydrogen phosphate ([C<sub>4</sub>mim]DHP) were synthesized as a new class of proton-conducting ionic plastic crystals. Both [N<sub>1.1.1.2OH</sub>]DHP and [C<sub>4</sub>mim]DHP showed solid–solid phase transition(s) and showed a final entropy of fusion lower than 20 J K<sup>−1</sup> mol<sup>−1</sup> which is consistent with Timmerman’s criterion for molecular plastic crystals. The ionic conductivity of [N<sub>1.1.1.2OH</sub>]DHP was in the range of 10<sup>−6</sup> S cm<sup>−1</sup>–10<sup>−3</sup> S cm<sup>−1</sup> in the plastic crystalline phase. On the other hand, the ionic conductivity of [C<sub>4</sub>mim]DHP showed about 10<sup>−5</sup> S cm<sup>−1</sup> in the plastic crystalline phase. [N<sub>1.1.1.2OH</sub>]DHP showed one order of magnitude higher ionic conductivity than [C<sub>4</sub>mim]DHP in the temperature range where the plastic phase is stable.<br /> |
Identificador | |
Idioma(s) |
eng |
Publicador |
Elsevier |
Relação |
http://dro.deakin.edu.au/eserv/DU:30030296/forsyth-newclassofproton-2007.pdf http://dx.doi.org/10.1016/j.elecom.2007.01.024 |
Direitos |
2007, Elsevier B.V. |
Palavras-Chave | #solid acid #plastic crystal #ionic liquid #proton conductor #fuel cell |
Tipo |
Journal Article |