Electrochemical Characterization of TEMPO Radical in Ionic Liquids
Electrochemical Characterization of TEMPO Radical in Ionic Liquids
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DOI：
10.5796/electrochemistry.19-00054
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发表时间：
2020-01-01
期刊：
影响因子：
2.5
通讯作者：
Tokito, Shizuo
中科院分区：
文献类型：
--
作者：
Maruyama, Yuki;Nagamine, Kuniaki;Tokito, Shizuo
2，2，6，6-四甲基哌啶氧(TEMPO)的p型和n型氧化还原反应均在离子液体中成功进行，而在常规有机电解液中只有p型氧化还原反应可逆进行。由循环伏安曲线估算的非均相电子转移常数在离子液体中p型和n型TEMPO反应的准可逆体系范围内。由于离子液体的高粘度，在离子液体中的p型反应的速率常数比在乙腈基电解液中低三个数量级。离子液体电解液体系中准可逆的p型和n型氧化还原TEMPO反应表明，由TEMPO基聚合物组成的正负极有机自由基电池(ORBS)有望实现全有机、柔性、安全和对称。在所测试的离子液体中，p型和n型氧化还原电极电势之差为1.7V，这一值表明了对称球体的电动势。(C)日本电化学会，保留所有权利。
Both p- and n-type redox reactions for 2,2,6,6-tetramethylpiperidinyloxy (TEMPO) successfully proceeded in ionic liquids, although only p-type redox proceeds reversibly in conventional organic electrolytes. The heterogeneous electron-transfer constants estimated from the cyclic voltammograms were in the range of the quasi-reversible system for both p- and n-type TEMPO reactions in ionic liquids. The rate constant for a p-type reaction in ionic liquids were lower by three orders of magnitude than that in the acetonitrile-based electrolyte due to the high viscosity of the ionic liquids. Quasi-reversible p- and n-type redox TEMPO reactions in the ionic liquid-based electrolyte systems suggest the potential realization totally-organic, flexible, safe, and symmetric organic radical batteries (ORBs) which are composed of TEMPO-based polymers for both positive and negative electrodes. The difference between p- and n-type redox electrode potential was 1.7V in the tested ionic liquids, a value that suggests the electromotive force of symmetric ORB. (C) The Electrochemical Society of Japan, All rights reserved.