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Microwave Activation of Electrochemical Processes in Ionic Liquid Impregnated Ionomer Spheres |
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| Authors: | Sara E C Dale Richard G Compton Frank Marken |
| Institution: | 1. Department of Chemistry, University of Bath, Claverton Down, Bath BA2?7AY, UK;2. Department of Chemistry, Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1?3QZ, UK |
| Abstract: | The redox system K4Fe(CN)6 adsorbed into anion exchanger particles (Dowex 1×2 of typically 200 µm diameter) and impregnated with 1‐butyl‐3‐methyl‐imidazolium tetrafluoroborate ionic liquid (BMIM+BF4?) in contact to a 50 µm diameter platinum microelectrode show well‐defined Fe(III/II) voltammetric responses. Processes are studied at the ionic liquid sphere | electrode | 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. |
| Keywords: | Electroanalysis Ionic liquids Microelectrode Microwave Ferrocyanide Solid state voltammetry Molecular gas sensor |