A stable electrochemically active copper interface for room-temperature ionic liquid via surface modification to a metal-organic charge-transfer complex

作者：Hanyu Yuki; Honma Itaru^*

来源：Journal of Materials Chemistry, 2011, 21(25): 9154-9159.

DOI：10.1039/c1jm00026h

A novel electrochemical interface between metal electrode and room-temperature ionic liquid (RTIL) was prepared by a procedurally facile method. A morphologically uniform and stable metal-quinone charge-transfer complex film of copper-2,3-dicyano-5,6-dichloro-1,4-benzo-quinone (Cu-DDQ) was found to possess lithium active interface against 1-ethyl-3-methylimidazolium bis[(trifluoromethyl) sulfonyl] imide ([EMIm][Tf2N]), an RTIL. The cyclic voltammetry of the film showed reversible ionic charge transfers occurring across the interface. The electrochemical impedance spectroscopy indicated that the interfacial impedance may become as low as similar to 1000 Omega cm(-2). The bias-induced reversible transport of lithium ion was further confirmed by the XPS method. These results suggest that metal-organic CT complex salts prepared on metal electrodes by a simple surface modification may become an excellent electrochemically active interface with RTIL.

• 出版日期2011