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New Electrolytes for Modern Electrochemical Applications
Reiter, Jakub ; Mička, Zdeněk (advisor) ; Opekar, František (referee) ; Vlček, Antonín (referee)
1. Introduction Electrochemical and mechanical properties of polymer gel electrolýes have been intensively investigated since the introduction ofthe 1" generation of solid polyrrner electrolýes by M.Armand [1]. Their electrochemical application includes secondary lithium batteries, supercapacitors, chemical sensors and electrochromic devices. Wide application of the gel polyrner electrolytes is allowed due to the hrgher ionic conductivity compared with solid polyrner electrolýes and due to the higher safety properties in comparison with common liquid electrolytes. Organic methacrylate-based polymers are perspective materials for their low toxicity both of monomer and polymer forrn, when methyl methacrylate (MMA) is widely used in the dental praxis. Poly(methyl methacrylate) PMMA was used in electrochemistry for the frst time by Iijíma [2] and than either pure or in different polymer modifications including varlous copolymers [3, 4]. Aprotic solvents like sulpholane, organic carbonates, N,N- dimethylformamide, and formamide are usually incorporated in the polymer structure to form ternary electrolýe polymer-solvent-salt. PMMA polymer gel electrolytes with embedded particles of nanosized TiO2 [5], carbon [6] or proton-conductive membranes with different organic acids t7l oÍ orthophosphoric acid [8] were...
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Amperometric Solid-State NO2 Sensor with Ionic Liquid-Polymer Electrolyte
Nádherná, M. ; Opekar, F. ; Reiter, Jakub
A new ionic liquid-polymer electrolyte was successfully tested in the planar amperometric solid-state sensor sensitive towards nitrogen dioxide. The electrolyte consists of 1-butyl-3-methylimidazolium hexafluorophosphate (BMIPF6) and poly(ethylene glycol) methyl ether methacrylate (PEGMEMA) in the ratio 57:43 mol. %. The analyte, gaseous nitrogen dioxide in air, was determined using the electrochemical reduction at900 mV vs. Pt/air on gold minigrid indicating electrode with Pt/air as a reference electrode. Dependency of sensor sensitivity on the indicating electrode area and relative humidity was determined. The sensor response is linear in the NO2 concentration range 0.3 1.1 ppm and is reproducible and long-term stable.
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Li+ a H+ vodivé polymerní elektrolyty s kovalentně vázanými anionty
Reiter, Jakub ; Michálek, Jiří ; Přádný, Martin ; Chmelíková, Dana ; Širc, Jakub
New single-ion conducting electrolytes based on methacrylates were prepared using direct, radically initiated polymerisation: copolymers of methacrylic acid (MA) or lithium methacrylate (LiMA) with 2-ethoxyethyl methacrylate (EOEMA) and poly(ethylene glycol) methyl ether methacrylate (EGMEMA) as pure cationically conducting Li+ or H+ electrolytes and covalently bonded carboxylic group. For the conductivity improvement, a set of electrolytes with embedded aprotic solvent (propylene carbonate PC or N,N-dimethylformamide DMF) was prepared.
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Elektrochemické redoxní procesy polymerních elektrolytech na bázi methakrylátů – studie na mikroelektrodě
Nádherná, Martina ; Reiter, Jakub
In our recent project we have investigated electrochemical behaviour of ferrocene in liquid and polymer aprotic electrolytes using various electrochemical methods. The apparent diffusion coefficients were determined for propylene carbonate and poly(ethyl methacrylate)-propylene carbonate medium. Thank to optimised electrolyte composition, the polymerisation lowers the mobility of ferrocene only by 15 – 50 times contrary to previously studied PMMA-PC (Superacryl-based) electrolytes, where approx. three order decrease of diffusion coefficients was found.
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