Electrochemical and electroanalytical studies of solid compounds and materials  Page description

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Details of project

  
Identifier
46987
Type K
Principal investigator Inzelt, György
Title in Hungarian Szilárd anyagok és vegyületek elektrokémiai és elektroanalitikai vizsgálata
Title in English Electrochemical and electroanalytical studies of solid compounds and materials
Panel Chemistry 1
Department or equivalent Institute of Chemistry (Eötvös Loránd University)
Starting date 2004-01-01
Closing date 2008-06-30
Funding (in million HUF) 7.035
FTE (full time equivalent) 0.00
state closed project





 

Final report

  
Results in Hungarian
Szilárd anyagok vizsgálata az elektrokémia és az elektroanalitika egy új területe. Ide sorolható minden olyan kísérlet, amikor egy vezető (elektród) felületén rögzítünk valamilyen anyagot, és olyan oldószerben vizsgáljuk, amelyben oldhatatlan. E projekt keretében a következő rendszereket állítottuk elő illetve vizsgáltuk: i) RuCl3, ii) TCNQ, iii) fenazin and fenazin polimerek (poli-o-feniléndiamin, polifenazin), iv) ittrium-hexaciano-ferrát, v) nanokompozitok: RuCl3-polianilin, RuCl3-polipirrol, vi) fém-szulfidok. A két fő vizsgálati módszer az elektrokémiai kvarckristály-nanomérleg(EQCM) és az impedanciaspektroszkópia(EIS) volt. Valamennyi rendszernél tisztáztuk a redoxi átalakulásokat kísérő ioncsere- és oldószerszorpciós folyamatok mechanizmusát és kinetikáját. A fenazin esetén a leválási-oldódási folyamatok jellemzésére is sor került, kimutattuk egy töltésátviteli komplex képződését. Elsőként elektropolimerizáltunk szilárd anyagokat. Új módszert dolgoztunk ki a kristályok oldódásának elkerülésére, amikor a töltött forma oldható vízben, aminek a lényege a víz aktivításának csökkentése. A RuCl3 és a TCNQ esetén kimutattuk a szilárd-szilárd fázisátalakulást, és ezt a folyamatot kísérő jellemző EQCM frekvenciaváltozást is értelmeztük. Egy új modellt állítottunk fel az EIS mérési adatok értelmezésére. Kidolgoztuk a fém-szulfidok meghatározását természetes vízekben.
Results in English
The investigation of solid materials immobilized on an electrode surface has become a new area of electroanalytical chemistry, recently. In this project the following systems were prepared and/or studied: i) RuCl3, ii) TCNQ, iii) phenazine and phenazine polymers (poly-o-phenylenediamine, polyphenazine), iv) yttrium-hexacyano-ferrate, v) nanocomposites: RuCl3-polyaniline, RuCl3-polypyrrole, vi) metal-sulfides. The main experimental methods were the electrochemical quartz crystal nanobalance(EQCM) and impedance spectroscopy(EIS). In the case of all systems the mechanism and kinetics of the ion-exchange and solvent sorption processes accompanying the redox transformations have been elucidated. Deposition and dissolution processes during the electrochemical processes of phenazine have been characterized, the formation of a charge-transfer complex was established. A new method, the solid-state electropolymerization was introduced. The solubility problem of microcrystals, when the charged form is soluble in water, was eliminated by decreasing the water activity, e.g., by applying electrolyte of high concentration. The anomalous variation of the EQCM frequency response during the solid-solid phase transition was explained. A new model was elaborated for the proper interpretation of EIS results. A method was proposed for the determination of metal-sulfides in natural water samples.
Full text http://real.mtak.hu/1651/
Decision
Yes





 

List of publications

  
G. Inzelt, Z. Puskás: Adsorption and precipitation during the redox transformations of phenazine, Electrochimica Acta 49, 1969-1980., 2004
G. Láng, M. Ujvári, G.Inzelt: Analysis of the impedance spectra of Pt / poly(o-phenylenediamine) electrodes - hydrogen adsorption and the brush model of the polymer films, J. Electroanal. Chem. 572, 283-297, 2004
G. Inzelt, G.G. Láng and M. Ujvári: The analysis of electrochemical impedance spectra based on a brush model of polymer films, 83rd International Bunsen Discussion Meeting, In situ Spectroelectrochemistry, Dresden, Germany, Book of Abstract, O9-12, 2004
G. Inzelt, Z. Puskás: Adsorption and precipitation during the redox transformations of phenazine, 55th Annual Meeting of ISE, 2004 Thessaloniki, Görögország, Book of Abstract I. p. 258, 2004
G. Inzelt: Electrochemical microgravimetric study on microcrystalline particles of phenazine attached to gold electrodes, International Conference on Electrode Processes, Szczyrk, Lengyelország, Book of Abstract, p. 64, 2004
Z. Puskás, G. Inzelt: Formation and redox transformation of polyphenazine, 55th Annual Meeting of ISE, Thessaloniki, Görögország, Book of Abstract I. p. 388, 2004
G. Inzelt: Charge transport in conducting polymer film electrodes (plenary lecture), 4th Croatian Symposium on Electrochemistry, Primosten,, 2006
G. Láng, G.Inzelt, A.Vrabecz,G.Horanyi: Electrochemical aspects of some specific features connected with the behaviour of iron group metals in aqueous perchloric acid/perchlorate media, J. Electroanal. Chem. 582,249-257, 2005
G. Inzelt: Electrochemically induced transformations of RuCl3 microcrystals and their effect on th electrocatalytic properties, 4th Baltic Conference on Electrochemistry, Greifswald, Nemetorszag, Book of Abstract O-17, 2005
G. Inzelt: Standard potentials, Encyclopedia of Electrochemistry (eds. A.J.Bard, M.Stratmann) Inorganic Electrochemistry Vol.7 (eds. F.Scholz, Ch.Pickett) Wiley-VCH Ch.1 PP.1-16, 2006
G. Inzelt: Standard formal and other characteristic potentials of selected electrode reactions, Encyclopedia of Electrochemistry (eds. A.J.Bard, M.Stratmann) Inorganic Electrochemistry Vol.7 (eds. F.Scholz, Ch.Pickett) Wiley-VCH Ch.2 PP.17-75, 2006
G. Inzelt: Nitrogen oxides and oxyanions, Encyclopedia of Electrochemistry (eds. A.J.Bard, M.Stratmann) Inorganic Electrochemistry Vol.7 (eds. F.Scholz, Ch.Pickett) Wiley-VCH Ch.7.2 PP.235-252, 2006
G. Inzelt: The nickel group (nickel, palladium, platinum), Encyclopedia of Electrochemistry (eds. A.J.Bard, M.Stratmann) Inorganic Electrochemistry Vol.7 (eds. F.Scholz, Ch.Pickett) Wiley-VCH Ch.17 PP.499-528, 2006
G. Inzelt: Charge transport in conducting polymer film electrodes, Chemical and Biochemical Engineering Quaterly 21, 1-14, 2007
G. Láng, M. Ujvári, T.A. Rokob, G.Inzelt:: The brush model of polymer films – analysis of the impedance spectra of Au, Pt│poly(o-phenylenediamine) electrodes, Electrochimica Acta 51: 1680-1694, 2006
G.Inzelt:: Einstein and the osmotic theory, J. Solid State Electrochem., 10, 1008-1011 (2006), 2006
G. Inzelt: Michael Polányi (1891-1976), the electrochemist, Russian J. Electrochemistry: 42, 109-110, 2006
G. Inzelt: Charge transport in conducting polymer film electrodes (plenary lecture), 4th Croatian Symposium on Electrochemistry, Primosten,, 2006
G. Inzelt: Electrochemical nanogravimetric studies of solid RuCl3 and RuCl3-polyaniline nanocomposite, 57th Annual Meeting of ISE, Edinburgh, United Kingdom, 2006
G. Inzelt: Vegykonyhájában szintén megteszi (A kémiáról és más dolgokról), Akadémiai kiadó, Budapest, 348 old., 2006
G. Inzelt: Charge transport in conducting polymer film electrodes, Chemical and Biochemical Engineering Quaterly 21, 1-14, 2007
Á.Kriston, G. Inzelt: Estimation of the characteristic parameters of PEMFCs proton exchange membrane fuel cells under operating conditions, Journal of Applied Electrochemistry 38, 415-424, 2008
G. Inzelt, K.Németh,A.Róka: Electrochemical quartz crystal microbalance study of redox transformations of TCNQ microcrystals in concentrated LiCl solutions, 58th Annual Meeting ofISE, Banff, Canada, 2008
G. Inzelt: Conducting Polymers - A New Era in Electrochemistry, Springer-Verlag, Berlin, Heidelberg, 2008
G. Inzelt, A.Róka: Why to use piezoelectric nanogravimetry for the study of electrochemical transformations of immobilized microparticles, 1st Regional Symposium on Electrochemistry of South-East Europe, p.109, 2008
Z. Puskás, G. Inzelt: Electrochemical microgravimetric study on microcrystalline particles of phenazine attached to gold electrodes, J. Solid State Electrochem.: 8, 828-841, 2004
G. Inzelt, Z. Puskás: Electrochemical quartz crystal microbalance study on the redox transformations of ruthenium(III)trichloride microcrystals attached to a gold electrode, Electrochemistry Communications 6, 805-811, 2004
G.Inzelt,Z.Puskas,K.Nemeth,I.Varga: Electrochemically induced transformations of ruthenium (III)trichloride microcrystals in salt solutions, J.Solid State Electrochemistry 9, 823-835, 2005
Z. Puskás, G. Inzelt: Formation and redox transformations of polyphenazine, Electrochimica Acta 50, 1481-1490, 2005
A. Róka, I. Varga, G. Inzelt:: Electrodeposition and dissolution of yttrium-hexacyanoferrate layers, Electrochimica Acta 51: 6243-6250, 2006
G.Inzelt, Z.Puskás: Electrochemical nanogravimetric study on the ruthenium(III) trichloride-polyaniline nanocomposite, J. Solid State Electrochem. 10: 125-133, 2006
G. Inzelt, K. Németh and A. Róka:: Electrochemical quartz crystal microbalance study of redox transformations of TCNQ microcrystals in concentrated LiCl solutions, Electrochimica Acta 52, 4015-4023, 2007
I.Ciglenecki, E.Bura-Nakic,G. Inzelt: Voltammetry as an alternative tool for trace metal detection in peloid marine sediments, Electroanalysis 19, 1437-1445, 2007
G. Inzelt, A.Róka: Preparation and electrochemical nanogravimetric study on the ruthenium(III) trichloride-polypyrrole nanocomposite, Electrochimica Acta 53, 3932-3941, 2008
G. Inzelt: Mikrokristályok és mikrocseppek elektrokémiája, A kémiai újabb eredményei 99.kötet (szerk. B.Csákvári),Akadémiai Kiadó, Budapest, 7-65.old., 2007



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