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Microwave Activation of Electrochemical Processes in Ionic Liquid Impregnated Ionomer Spheres
Author(s) -
Dale Sara E. C.,
Compton Richard G.,
Marken Frank
Publication year - 2012
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201200003
Subject(s) - ionic liquid , microelectrode , platinum , electrode , electrochemistry , tetrafluoroborate , inorganic chemistry , analytical chemistry (journal) , chemistry , relative humidity , materials science , adsorption , microwave , chemical engineering , catalysis , chromatography , organic chemistry , physics , quantum mechanics , engineering , thermodynamics
Abstract The redox system K 4 Fe(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 + BF 4 − ) 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 + BF 4 − 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.