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The electrochemical redox processes in methacrylate-based polymer electrolytes – study on microelectrodes
Nádherná, Martina; Reiter, Jakub
2008 - English
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. V tomto projektu jsme studovali elektrochemické chování ferrocenu v kapalných a v polymerních aprotických elektrolytech s využitím různých elektrochemickým metod. Hodnoty difúzních koeficientů ferrocenu byly stanoveny pro propylenkarbonát a pro polymerní elektrolyt poly(ethyl methakrylát)-propylen karbonát. Díky optimalizaci složení elektrolytu, polymerizace snížila mobilitu ferrocenu jen 15 – 50krát ve srovnání s dříve používaným PMMA-PC elektrolytem (na bázi Superakrylu), kde byl pokles difúzního koeficientu asi o tři řády.
Keywords:
polymer aprotic electrolytes
Available at various institutes of the ASCR
The electrochemical redox processes in methacrylate-based polymer electrolytes – study on microelectrodes
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 ...
Presence of hyrogen peroxide in SnO2 thin films preparation
Macalík, M.; Sedlaříková, M.; Vondrák, Jiří
2008 - English
Tin dioxide, SnO2, is a semiconductor exhibiting good electric conductivity, optical transparency and reflectivity in infrared irradiation. Good transparency is connected to the 3 eV width of the band gap. Přídavek peroxidu vodíku při přípravě tenkých vrstev SnO2.
Keywords:
nanosized or layered material
Available at various institutes of the ASCR
Presence of hyrogen peroxide in SnO2 thin films preparation
Tin dioxide, SnO2, is a semiconductor exhibiting good electric conductivity, optical transparency and reflectivity in infrared irradiation. Good transparency is connected to the 3 eV width of the band ...
Carbon based electrode materials for supercapacitors
Dvořák, P.; Vognar, J.; Vondrák, Jiří; Sedlaříková, M.
2008 - English
Research into supercapacitors is divided into two main spheres according their energy storage principles. Elektrodové materiály na bázi uhlíku pro superkapacitory.
Keywords:
special electrochemical components
Available at various institutes of the ASCR
Carbon based electrode materials for supercapacitors
Research into supercapacitors is divided into two main spheres according their energy storage principles.
Elektrodové materiály na bázi uhlíku pro superkapacitory.
Cobalt aditives in nickel hydroxide prepared by electrodeposition
Vrbický, J.; Špičák, P.; Svoboda, V.; Vondrák, Jiří; Sedlaříková, M.; Kazelle, J.
2008 - English
Nickel hydroxide is the basic material for positive electrode of alkaline accumulators as Ni-Cd, Ni-MH and Ni-Fe. The three modification of nickel hydroxide is known, alpha, beta and gama. Přídavek kobaltu do hydroxidů niklu připravených elektrodeposicí.
Keywords:
accumulators
Available at various institutes of the ASCR
Cobalt aditives in nickel hydroxide prepared by electrodeposition
Nickel hydroxide is the basic material for positive electrode of alkaline accumulators as Ni-Cd, Ni-MH and Ni-Fe. The three modification of nickel hydroxide is known, alpha, beta and ...
Li+ and H+ single-ion conducting polymer electrolytes
Reiter, Jakub; Michálek, Jiří; Přádný, Martin; Chmelíková, Dana; Širc, Jakub
2008 - English
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. Přímou radikálovou síťující polymerizací byly připraveny nové polymerní elektrolyty s kovalentně vázanými anionty na bázi methakrylátů, kopolymery kyseliny methakrylové (MA) nebo methakrylanu lithného (LiMA) s 2-ethoxyethylmethakrylátem (EOEMA) nebo s ethylenglykolmethylether methakrylátem (EGMEMA), jako čistě iontové vodiče s pohyblivými H+ nebo Li+ ionty a kovalentně vázaným karboxylovým aniontem. Pro zvýšení vodivosti těchto binárních kopolymerů byla připravena řada elektrolytů s ukotveným aprotickým rozpouštědlem (propylenkarbonát, PC nebo N,N-dimethylformamid, DMF).
Keywords:
electrolytes
Available at various institutes of the ASCR
Li+ and H+ single-ion conducting polymer electrolytes
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 ...
Heterogeneity of PMMA-pc based gel electrolytes
Krejza, O.; Špičák, P.; Sedlaříková, M.; Vognar, J.; Vondrák, Jiří
2008 - English
Heterogeneity of PMMA-pc based gel electrolytes. Různorodost PMMA-pc základních gel-elektrolitů.
Keywords:
gel electrolytes
Available at various institutes of the ASCR
Heterogeneity of PMMA-pc based gel electrolytes
Heterogeneity of PMMA-pc based gel electrolytes.
Různorodost PMMA-pc základních gel-elektrolitů.
Determination of difference of T2 relaxation time measurement with PMMA based gel electrolytes
Vognar, J.; Macalík, M.; Špičák, P.; Bartušek, Karel; Novák, V.; Vondrák, Jiří
2008 - English
T2 relaxation is complex phenomenon, but at its most fundamental level, it corresponds to a decoherence of the transverse nuclear spin magnetization. Určení rozdílů relaxačních časů T2 u PMMA gelových elektrolytů.
Keywords:
gel electrolytes; PMMA
Available at various institutes of the ASCR
Determination of difference of T2 relaxation time measurement with PMMA based gel electrolytes
T2 relaxation is complex phenomenon, but at its most fundamental level, it corresponds to a decoherence of the transverse nuclear spin magnetization....
Nanocomposite electrode materials with spinel structure for lithium-ion batteries
Jirák, T.; Vondrák, Jiří; Sedlaříková, M.
2008 - English
The article treats of electrode materials for lithium secondary batteries, concretely nanostructured Li4Ti5O12. Nanokompositní elektrodové materiály se spinelovou strukturou pro lithno-iontové baterie.
Keywords:
accumulators; nanocomposite electrode materials
Available at various institutes of the ASCR
Nanocomposite electrode materials with spinel structure for lithium-ion batteries
The article treats of electrode materials for lithium secondary batteries, concretely nanostructured Li4Ti5O12....
Mesoporous nickel-nickel oxide for the fuel cell catalyst
Barath, Peter; Uhlířová, Tereza; Reiter, Jakub
2008 - English
Nanostructured (mesoporous) nickel-nickel oxide was prepared from the medium of the lyotropic liquid crystals. The electrochemical properties of the material deposited in thin layers were studied, especially the hydrogen oxidation reaction. The catalyst exhibits remarkable catalytic activity. Z prostředí lyotropních kapalných krystalů byl připraven nanostrukturní (mezoporézní) materiál nikl-oxid nikelnatý v podobě tenkých vrstev a byly studovány jeho elektrochemické vlastnosti, především oxidace vodíku. Materiál vykazuje značnou katalytickou aktivitu.
Keywords:
fuel cell catalyst
Available at various institutes of the ASCR
Mesoporous nickel-nickel oxide for the fuel cell catalyst
Nanostructured (mesoporous) nickel-nickel oxide was prepared from the medium of the lyotropic liquid crystals. The electrochemical properties of the material deposited in thin layers were studied, ...
Polymer electrolytes for lithium-ion batteries operating at elevated temperatures
Reiter, Jakub; Dominko, R.; Jakubec, Ivo; Michálek, J.
2008 - English
Methacrylate-based polymer electrolytes with lithium perchlorate or lithium bis(oxalato)borate were prepared and studied as perspective materials for lithium-ion batteries operating at elevated temperatures (70 – 80 °C) and exibiting higher electrochemical and chemical stability towards oxidation. The accesible potential window on gold electrode was found to be 4.9 – 5.1 V vs. Li/Li+. The ionic conductivity at 70 °C is 1.9 – 2.4 mS/cm. Byly studovány polymerní elektrolyty s chloristanem lithným nebo bis(oxalato)boritanem lithným pro lithno-iontové baterie pracující za vyšších teplot (70 – 80 °C), které vykazují vyšší elektrochemickou a chemickou stabilitu vůči oxidaci. U těchto elektrolytů bylo zjištěno dostupné potenciálové okno na zlatě až do 4,9 – 5,1 V vs. Li/Li+. Iontová vodivost při 70 °C je 1,9 – 2,4 mS/cm.
Keywords:
polymer electrolytes
Available at various institutes of the ASCR
Polymer electrolytes for lithium-ion batteries operating at elevated temperatures
Methacrylate-based polymer electrolytes with lithium perchlorate or lithium bis(oxalato)borate were prepared and studied as perspective materials for lithium-ion batteries operating at elevated ...
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