A Comparative Study of the Electrochemical Characteristics of [Emim(+)][BF4-] and [Bmim(+)][BF4-] Ionic Liquids at the Surfaces of Carbon Nanotube and Glassy Carbon Electrodes

作者：Zheng Jianping; Moganty Surya S; Goonetilleke Pubudu C; Baltus Ruth E; Roy Dipankar^*

来源：Journal of Physical Chemistry C, 2011, 115(15): 7527-7537.

DOI：10.1021/jp1123162

The electrochemical interfaces of a glassy carbon (GC) electrode and a carbon nanotube (CNT) paper electrode have been studied in 1-ethyl-3-methylimidazolium tetraflouroborate (EmimBF(4)) and 1-butyl-3-methylimidazolium tetrafluoroborate (BmimBF(4)) ionic liquids (ILs) using direct current (DC) cyclic voltammetry (CV) and alternating current (AC) electrochemical impedance spectroscopy (EIS). These four electrode/electrolyte combinations serve as reperesentative models of the relatively unconventional, spatially inhomogeneous IL-carbon interfaces that are potentially useful for electrochemical energy storage/conversion devices. The present work exploresin detail the double-layer capacitances as well as other essential electrochemical features of these interfaces. The voltage-dependent double-layer capacitances, and interfacial charge transfer resistances have been determined within the nonfaradaic windows of these systems, independently, by using CV and EIS. The results of the DC and AC measurements have been compared to demonstrate how the material properties of such complex systems can affect their characterization procedures if they are simply treated as classical ideally polurized interfaces.

• 出版日期2011-4-21