Amphoteric water as acid and base for protic ionic liquids and their electrochemical activity when used as fuel cell electrolytes.
Amphoteric water as acid and base for protic ionic liquids and their electrochemical activity when used as fuel cell electrolytes.
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DOI：
10.1039/c7fd00132k
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发表时间：
2017
影响因子：
3.4
通讯作者：
M. S. Miran;T. Yasuda;R. Tatara;Md. Abu Bin Hasan Susan;M. Watanabe
中科院分区：
文献类型：
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作者：
M. S. Miran;T. Yasuda;R. Tatara;Md. Abu Bin Hasan Susan;M. Watanabe
将两性水与等摩尔量的超强酸三氟甲磺酸（TfOH）和超强碱1，8-二氮杂双环[5.4.0]-7-十一碳烯（DBU）混合。散装的物理化学和电化学性质的混合物进行了比较，与那些最好的质子离子液体（PIL），二乙基甲基铵三氟甲磺酸盐（[德玛][TfO]），它具有优良的物理化学性质作为燃料电池电解质。酸性混合物（[H3 O][TfO]）表现为质子离子液体，而碱性混合物（[DBU]OH）显示不完全质子转移。瓦尔登图表明，[H3 O][TfO]表现为良好的PIL，类似于[dema][TfO]，而[DBU]OH表现为较差的PIL。[H3 O][TfO]在80 °C下显示出优异的H2/O2燃料电池性能;然而，由于在本体水存在下Pt的氧化导致的电极动力学的延迟，随着本体水含量的增加，性能劣化。另一方面，[DBU]OH表现出非常差的性能，可能是因为在系统中的中性物种的存在。
Amphoteric water was mixed with equimolar amounts of a super-strong acid, trifluoromethanesulfonic acid (TfOH), and a super-strong base, 1,8-diazabicyclo[5.4.0]-7-undecene (DBU). Bulk physicochemical and electrochemical properties of the mixtures were compared with those of the best ever reported protic ionic liquid (PIL), diethylmethylammonium trifluoromethanesulfonate ([dema][TfO]), which has excellent physicochemical properties as a fuel cell electrolyte. The acidic mixture ([H3O][TfO]) behaved as a protic ionic liquid, while the basic mixture ([DBU]OH) showed incomplete proton transfer. The Walden plot indicated that [H3O][TfO] behaves as a good PIL, similar to [dema][TfO], whereas [DBU]OH behaves as a poor PIL. [H3O][TfO] showed excellent H2/O2 fuel cell performance at 80 °C; however, the performance deteriorated as the bulk water content increased, because of the retardation of the electrode kinetics due to the oxidation of Pt in the presence of bulk water. On the other hand, [DBU]OH exhibited very poor performance possibly because of the existence of neutral species in the system.