Luo Huimin, Baker Gary A, Lee Je Seung, Pagni Richard M, Dai Sheng
J Phys Chem B. 2009 Apr 2;113(13):4181-3. doi: 10.1021/jp901312d.
Protic ionic liquids are synthesized via proton transfer from acids to organic bases. One of the key issues associated with conventional protic ionic liquids is the thermal instability resulting from temperature-induced decomposition via reverse proton transfer. This shortcoming significantly hampers the use of these protic ionic liquids in separations, electrochemical capacitors, fuel cells, and so forth. Herein we show that it is possible to prepare protic ionic liquids with thermal stabilities approaching those of common aprotic ionic liquids. Our new class of protic ionic liquids, derived via integrated neutralization and metathesis of superbasic phosphazenes or guanidines, exhibits exceptionally low vapor pressures at 150 degrees C while being stable to strong alkali agents such as aqueous KOH, suggesting potential in energy-related applications, including electrochemical capacitors and PEM-type fuel cells.
质子离子液体是通过质子从酸转移到有机碱而合成的。与传统质子离子液体相关的关键问题之一是由温度诱导的通过逆质子转移的分解导致的热不稳定。这一缺点严重阻碍了这些质子离子液体在分离、电化学电容器、燃料电池等方面的应用。在此我们表明，有可能制备出热稳定性接近普通非质子离子液体的质子离子液体。我们通过超碱性磷腈或胍的中和与复分解反应衍生出的新型质子离子液体，在150℃时具有极低的蒸气压，同时对强碱试剂（如水溶液KOH）稳定，这表明其在包括电化学电容器和质子交换膜型燃料电池在内的能源相关应用中具有潜力。
