2024 - Sustainable Industrial Processing Summit
SIPS 2024 Volume 16. Intl. Symp on Electrochemistry, Molten Salts, Corrosion, Recycling and Battery
| Editors: | F. Kongoli, C.A. Amatore, R. Fehrmann, G. Kipouros, I. Paspaliaris, G. Saevarsdottir, R. Singh, R. Gupta, M. Halama, D. Macdonald, F. Wang, M. Barinova, F. Ahmed, C. Gaidau, X. Guo, K. Kolomaznik, H. Ozgunay, K. Tang, N.N. Thanh, S. Yefremova, K. Aifantis, Z. Bakenov, C. Capiglia, V. Kumar, A. U. H. Qurashi, A. Tressaud, R. Yazami |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2024 |
| Pages: | 243 pages |
| ISBN: | 978-1-998384-34-1 (CD) |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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ELECTROCHEMISTRY IN ADSORBED 2D LAYER ON THE LAGMUIR BLODGETT THROUGH
Lubomír Pospíšil1; František Vavrek1; Veronika Urbanová2; Tomáš Bartl2; Paul Ionut Dron2; Josef Michl2; Oldřich Pačes2; Katarina Varga2;1J. HEYROVSKÝ INSTITUTE OF PHYSICAL CHEMISTRY, CZECH ACADEMY OF SCIENCES, Prague, Czech Republic; 2INSTITUTE OF ORGANIC CHEMISTRY AND BIOCHEMISTRY, CZECH ACADEMY OF SCIENCES, Prague, Czech Republic;
Type of Paper: Regular
Id Paper: 30
Topic: 47
Abstract:
Electrochemical investigation of ultrathin compact 2-D layers started with a report Brdička[1]of adsorption of a solute at Hg-water. Many reports were summarized in reviews.[2],[3] Scanning tunneling methods were applied, and electron transfer from surface attached ferrocene derivatives was examined as a function of distance from a metallic electrode.[4],[5] However, as far as we know, there is no previous study on the electron transfer in the case of contacting a LB monolayer with an electrode at a solution-air interface. An electrochemical Langmuir-Blodgett trough that permits the examination of local redox processes in a layer floating on the surface of water with an STM-type tip ultramicroelectrode (UMC) was constructed. Material was polypropylene. Wilhelmy plate balance and barrier position were controlled by a software. The trough is located inside a Faraday cage. Water level in the trough was kept constant by a linear syringe pump. The working electrode tip was located in the water phase. Approaching the layer with the tip was possible in micrometer and finally in nanometer steps, until it entered into the surface layer. For testing purpose we performed voltammetry of 1,1´¾dicarbooctadecyloxyferrocene. When in solutions and with UMC, this Fc derivative displays a reversible voltammogram. Stepwise approach of the tip from LB water phase towards the surface layer shows changes of the double layer and growth of a wave of Fc oxidation. The cyclic voltamogram has a hysteresis upon the reversal of the potential scan. The electrostatic repulsion of ferrocinium cation and a positive potential of the working electrode tip is most likely responsible for the current hysteresis. The tip electrode with the area of 9 μm2 yielded the limiting current 300 pA. Details are in our recent publication.[6]