Generator‐collector Voltammetry at Dual‐plate Gold‐gold Microtrench Electrodes as Diagnostic Tool in Ionic Liquids |
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| Authors: | Miguel Angel Montiel Jesus Iniesta Andrew J Gross Thies Thiemann Frank Marken |
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| Institution: | 1. University of Alicante, Department of Physical Chemistry and Institute of Electrochemistry, 03080 Alicante, Spain;2. Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK;3. United Arab Emirates University, Faculty of Science, Department of Chemistry, Al Ain, United Arab Emirates |
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| Abstract: | Ionic liquids provide high viscosity solvent environments with interesting voltammetric characteristics and new electrochemical mechanisms. Here, a gold‐gold dual‐plate microtrench electrode is employed in generator‐collector mode to enhance viscosity‐limited currents in ionic liquids due to fast feedback within small inter‐electrode gaps (5 μm inter‐electrode gap, 27 μm microtrench depth) and to provide a mechanistic diagnosis tool. Three redox systems in the ionic liquid BMIm+BF4? are investigated: (i) ferrocene oxidation, (ii) oxygen reduction, and (iii) 2‐phenyl‐naphthyl‐1,4‐dione reduction. Both transient and steady state voltammetric responses are compared. Asymmetric diffusion processes, reaction intermediates, and solubility changes in the ionic liquid are revealed. |
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| Keywords: | ionic liquid diffusion oxygen feedback sensing voltammetry |
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