Electrochemical reduction of oxygen in some hydrophobic room-temperature molten salt systems
Electrochemical reduction of oxygen in some hydrophobic room-temperature molten salt systems
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DOI：
10.1149/1.1626669
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发表时间：
2004-01-01
影响因子：
3.9
通讯作者：
Miura, T
中科院分区：
文献类型：
--
作者：
Katayama, Y;Onodera, H;Miura, T
研究了由双（三氟甲烷磺酸）亚胺（TFSI(-)）阴离子与三甲基-正己基铵（TMHA(+)）、1-丁基-1-甲基吡啶（BMP(+)）、1-乙基-3-甲基咪唑（EMI(+)）或1,2-二甲基-3-丙基咪唑（DMPI(+)）阳离子组成的疏水室温熔盐体系（离子液体）中氧的电化学还原。溶解在这些熔体中的氧被还原成金电极上的超氧离子。超氧离子对脂肪族和脂环有机阳离子（TMHA（+）和BMP(+)）稳定，但与芳香有机阳离子（EMI（+）和DMPI(+)）反应，表明亲核试剂攻击咪唑类阳离子组成的熔体。通过比较O(2)/O(2)（-）的氧化还原电位，估计这些TFSI（-）基熔盐体系的受体数与乙腈和二甲亚砜的受体数相当。在由脂肪族或脂环有机阳离子组成的熔体中，在金电极上，超氧化物离子进一步被还原为过氧化物。(C) 2003。
The electrochemical reduction of oxygen was investigated in some hydrophobic room-temperature molten salt systems (ionic liquids) consisting of bis(trifluoromethanesulfone) imide (TFSI(-)) anion with trimethyl-n-hexylammonium (TMHA(+)), 1-butyl-1-methylpyrrolidinium (BMP(+)), 1-ethyl-3-methylimidazolium (EMI(+)) or 1,2-dimethyl-3-propylimidazolium (DMPI(+)) cation. The oxygen dissolved in these melts was reduced to the superoxide ion on a gold electrode. The superoxide ion was stable against the aliphatic and alicyclic organic cations (TMHA(+) and BMP(+)) but reacted with the aromatic ones (EMI(+) and DMPI(+)), suggesting that nucleophilic reagents attack the melts consisting of imidazolium cations. The acceptor number of these TFSI(-)-based molten salt systems was estimated to be comparable to those of acetonitrile and dimethyl sulfoxide from the comparison of the redox potential of O(2)/O(2)(-). The superoxide ion was further reduced, presumably to the peroxide, on a gold electrode in the melts consisting of the aliphatic or alicyclic organic cation. (C) 2003 The Electrochemical Society.