Microwave Activation of Electrochemical Processes in Ionic Liquid Impregnated Ionomer Spheres

作者：Dale Sara E C; Compton Richard G; Marken Frank^*

来源：Electroanalysis, 2012, 24(5): 997-1002.

DOI：10.1002/elan.201200003

• Electroanalysis
• Ionic liquids
• Microelectrode
• Microwave
• Ferrocyanide
• Solid state voltammetry
• Molecular gas sensor

The redox system K4Fe(CN)6 adsorbed into anion exchanger particles (Dowex 1X2 of typically 200 mu m diameter) and impregnated with 1-butyl-3-methyl-imidazolium tetrafluoroborate ionic liquid (BMIM+BF4-) in contact to a 50 mu m diameter platinum microelectrode show well-defined Fe(III/II) voltammetric responses. Processes are studied at the ionic liquid sphere vertical bar electrode vertical bar gas interface in the presence of dry or 80?% relative humidity argon gas flow. Due to the hygroscopic nature of BMIN+BF4- currents are sensitive to humidity levels. Pulsed and continuous microwave activation (2.45 GHz) is shown to occur locally at the tip of the platinum microelectrode due to focusing of microwave energy. Impedance experiments reveal the presence of a thin active film of ionic liquid.

• 出版日期2012-5