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MnO2 studied by EQGM
Špičák, P.; Svoboda, V.; Sedlaříková, M.; Vondrák, Jiří; Kazelle, J.
2007 - English
Mass changes of electrodes containing MnO2 during charging and discharging processes were studied using QCMB techniques. The process is accompanied by reversible uptake of water and insertion of H3O+ insted of H+ should be expected. Pomocí QCMB byly studovány změny hmotnosti při nabíjení a vybíjení elektrod obsahujících MnO2. Redukce těchto elektrod je provázena vratnou sorbcí vody a lze předpokládat, že probíhá jako inserce iontů H3O+ a nikoli protonů H+.
Keywords:
EQCM
Available at various institutes of the ASCR
MnO2 studied by EQGM
Mass changes of electrodes containing MnO2 during charging and discharging processes were studied using QCMB techniques. The process is accompanied by reversible uptake of water and insertion of H3O+ ...
Progress in research of aprotic gel polymer electrolytes in Czechia
Vondrák, Jiří; Sedlaříková, M.; Krejza, O.; Velická, Jana
2007 - English
The progress of research of gel polymer electrolytes based on polymethacrylates and propylene carbonate is described. The electric conductivity and selected electrochemical processes in them is the main research field. Přehled výzkumu polymerních gelových elektrolytů. Studovány jsou elektrolyty na bázi polymerních methakrylátů a propylenkarbonátu především z hlediska elektrické vodivosti a vybraných elektrochemických procesů.
Keywords:
solid and polymeric conductors
Available at various institutes of the ASCR
Progress in research of aprotic gel polymer electrolytes in Czechia
The progress of research of gel polymer electrolytes based on polymethacrylates and propylene carbonate is described. The electric conductivity and selected electrochemical processes in them is the ...
Graphite electrode for Li-ion batteries
Makovička, J.; Sedlaříková, M.; Vondrák, Jiří
2007 - English
The results illustrate that the expanded graphote is a promising candidate for Li-ion batteries but irreversible capacity in the cycle has to be decreased. Grafitové elektrody jsou perspektivní pro Li-iontové články.
Keywords:
Li-ion batteries
Available at various institutes of the ASCR
Graphite electrode for Li-ion batteries
The results illustrate that the expanded graphote is a promising candidate for Li-ion batteries but irreversible capacity in the cycle has to be decreased....
Nanotubes as admixture for positive electrode in Li-ion batteries
Sysel, M.; Makovička, J.; Sedlaříková, M.; Vondrák, Jiří
2007 - English
Active mass for positive electrode of Li-ion batteries should be improved by carbon particles for enhancement of electrical conductivity. Carbon nanotubes were tested for this purpose. Aktivní hmota pro kladnou elektrodu Li-iontové baterie se zlepšuje přídavkem uhlíkových částic s cílem zvýšení elektronové vodivosti. K tomuto účelu byly zkoušeny uhlíkové nanotrubice.
Keywords:
Li-ion batteries
Available at various institutes of the ASCR
Nanotubes as admixture for positive electrode in Li-ion batteries
Active mass for positive electrode of Li-ion batteries should be improved by carbon particles for enhancement of electrical conductivity. Carbon nanotubes were tested for this purpose....
Manganese and nickel additives for electrode materials of lithium-ion batteries
Jirák, T.; Vondrák, Jiří; Sedlaříková, M.; Hejátková, E.
2007 - English
The properties of electrode material based on LiCoO2 were modified by substitution of cobalt by Ni and/or Mn compounds. Specific energy of new material was lower, but their lifetime (number of cycles) was improved. Vlastnosti elektrodového materiálu na bázi LiCoO2 byly zlepšovány substitucí kobaltu sloučeninami Ni a Mn. Měrná energie těchto elektrod se snižuje, ale životnost při cyklování je lepší.
Keywords:
Li-ion batteries
Available at various institutes of the ASCR
Manganese and nickel additives for electrode materials of lithium-ion batteries
The properties of electrode material based on LiCoO2 were modified by substitution of cobalt by Ni and/or Mn compounds. Specific energy of new material was lower, but their lifetime (number of cycles) ...
Kinetic properties of MnO2 based positive electrode with different dopants
Vognar, J.; Brudná, S.; Novák, V.; Vondrák, Jiří; Sedlaříková, M.
2007 - English
The present study aims at evaluating the activity of such manganise oxide-based electrocatalysts toward the ORR. Electrochemical measurement was realized by method of cyclic voltametry on RDE in three electrodes circuit. Elektrochemické měření bylo realizováno metodou cyklického voltametru na RDE v tří elektrodovém okruhu.
Keywords:
fuell cell
Available at various institutes of the ASCR
Kinetic properties of MnO2 based positive electrode with different dopants
The present study aims at evaluating the activity of such manganise oxide-based electrocatalysts toward the ORR. Electrochemical measurement was realized by method of cyclic voltametry on RDE in ...
HOR NiOx as elektrocatalysts for fuel cells H2-O2
Barath, P.; Sedlaříková, M.; Vondrák, Jiří; Chatenet, M.; Roche, I.
2007 - English
Ni Ni/C and Raney Ni materials were studied as electrocatalysts for the HOR in alkaline medium. Ni/C a Raneyův Ni byly studovany jako elektrokatalyzátory HOR v alkalickém médiu.
Keywords:
fuell cells
Available at various institutes of the ASCR
HOR NiOx as elektrocatalysts for fuel cells H2-O2
Ni Ni/C and Raney Ni materials were studied as electrocatalysts for the HOR in alkaline medium.
Ni/C a Raneyův Ni byly studovany jako elektrokatalyzátory HOR v alkalickém médiu.
Alpha nickel hydroxide stability in dependence on electrolyte concentration
Vrbický, J.; Vondrák, Jiří; Sedlaříková, M.
2007 - English
Alpha nickel hydroxide is stable in normal conditions, but in alkaline electrolytes is unstable. Alfa-Ni(OH)2 je stálý v normálních podmínkách, ale v alkalických elektrolytech je nestabilní.
Keywords:
electrolytes
Available at various institutes of the ASCR
Alpha nickel hydroxide stability in dependence on electrolyte concentration
Alpha nickel hydroxide is stable in normal conditions, but in alkaline electrolytes is unstable.
Alfa-Ni(OH)2 je stálý v normálních podmínkách, ale v alkalických elektrolytech je nestabilní.
The bubble removal from glass melts in a rotating cylinder
Tonarová, V.; Němec, Lubomír; Jebavá, Marcela
2007 - English
The goal of this work is to present results of the matematical modeling of bubble behaviour in the centrifugal field. Cíl této práce je prezentovat výsledky matematického modelování bublin v odstředivém poli.
Keywords:
glass melt; centrifugal force; fining cylinder
Available at various institutes of the ASCR
The bubble removal from glass melts in a rotating cylinder
The goal of this work is to present results of the matematical modeling of bubble behaviour in the centrifugal field....
Role referenčních materiálů v chemické analýze
Plzák, Zbyněk
2007 - Czech
Přednáška pojednává o výběru a použití referenčních materiálů v chemické analýze a při zajišťování návaznosti výsledků. Jsou uvedeny i nové definice referenčních materiálů a jejich důsledky. Choice and use of reference materials in chemical analysis and its role in establishing traceability of results is discused. New definition of reference meterials and their impact is presented.
Keywords:
chemical analysis; reference materials
Available at various institutes of the ASCR
Role referenčních materiálů v chemické analýze
Přednáška pojednává o výběru a použití referenčních materiálů v chemické analýze a při zajišťování návaznosti výsledků. Jsou uvedeny i nové definice referenčních materiálů a jejich ...
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