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Collection's Items (Sorted by Submit Date in Descending order): 1 to 16 of 16
Charvát, Jiří , Mazúr, Petr , Pocedič, Jaromír , Richtr, Přemysl , Mrlík, Jindřich , Kosek, Juraj , Akrman, Jiří , Kubáč, Lubomír
New organic-air flow fuel cell and electrolyser for stationary energy storage

In this work, we propose an innovative hybrid flow battery using anthraquinone disulfonic acid (AQDS) based negolyte in an AQDS-oxygen fuel cell and AQDS-oxygen electrolyser as a discharging and charging devices, respectively. The performance of the system is studied under defined conditions...

Halada, Štěpán , Zlatník, Jakub , Mazúr, Petr , Charvát, Jiří , Slouka, Zdeněk
Fast screening of carbon-based nanostructured materials as potential electrode materials for vanadium redox flow battery

Carbon-based nanostructured materials possess good electrochemical activity toward vanadium species employed in vanadium redox flow batteries (VRFB). However, fast screening and testing their electrochemical activity are challenging due to unreliable methods, depositing the nanomaterials onto solid current coll...

Belloň, tomáš , Slouka, Zdeněk
Overlimiting convection at a heterogeneous cation-exchange membrane studied by particle image velocimetry

Electroconvection and gravitational convection are recognized as the primary mechanisms driving overlimiting currents in ion-exchange systems. Here, we use particle image velocimetry (PIV) to characterize the convection on a small piece of a commercially available heterogeneous cation-exchange membrane. We...

Polezhaev, Petr , Slouka, Zdeněk , Lindner, Jiří , Přibyl, Michal
Characterization of slug flow of two aqueous phases by electrochemical impedance spectroscopy in a fluidic chip

We adopted a method of electrochemical impedance spectroscopy (EIS) for the characterization of slug flow of two immiscible aqueous phases in a flow channel. The impedance response (both magnitude and phase shift) of the two-phase system is measured as a function of time at se...

Mazúr, Petr , Charvát, Jiří , Mrlík, Jindřich , Pocedič, Jaromír , Akrman, Jiří , Kubáč, Lubomír , Řeháková, Barbora , Kosek, Juraj
Evaluation of Electrochemical Stability of Sulfonated Anthraquinone-Based Acidic Electrolyte for Redox Flow Battery Application

Despite intense research in the field of aqueous organic redox flow batteries, low molecular stability of electroactive compounds limits further commercialization. Additionally, currently used methods typically cannot differentiate between individual capacity fade mechanisms, such as degradation of electroactiv...

Charvát, Jiří , Mazúr, Petr , Paidar, Martin , Pocedič, Jaromír , Vrána, Jiří , Mrlík, Jindřich , Kosek, Juraj
The role of ion exchange membrane in vanadium oxygen fuel cell

The effect of membrane properties on the vanadium-oxygen fuel cell performance was studied on a series of commercially available ion exchange membranes of different thickness and ion exchange capacity by selected characterization techniques including electrochemical impedance spectroscopy (ohmic and c...

Polezhaev, Petr , Belloň, Tomáš , Vobecká, Lucie , Slouka, Zdeněk
Molecular sieving of alkyl sulfate anions on strong basic gel-type anion-exchange resins

The effort of today’s society towards green, wasteless, and economic production technologies brings new challenges concerning the efficiency of chemical processes. Electromembrane separations are considered as one of the possible candidates in tackling the challenges mentioned above. They offer a ...

Sánchez-Díez, Eduardo , Ventosa, Edgar , Guarnieri, Massimo , Trovó, Andrea , Flox, Cristina , Marcilla, Rebeca , Soavi, Francesca , Mazúr, Petr , Aranzabe, Estibaliz , Ferret, Raquel
Redox flow batteries: Status and perspective towards sustainable stationary energy storage

Redox-flow batteries, based on their particular ability to decouple power and energy, stand as prime candidates for costeffective stationary storage, particularly in the case of long discharges and long storage times. Integration of renewables and subsequent need for energy storage is promot...

Leskovjan, Martin , Němec, Jan , Plachá, Marie , Kočí, Petr , Isoz, Martin , Svoboda, Miloš , Novák, Vladimír , Price, Emily , Thompsett, David
Multiscale Modeling and Analysis of Pressure Drop Contributions in Catalytic Filters

Catalytic monolith filters with a honeycomb structure represent a key component of modern automotive exhaust gas aftertreatment systems. In this paper, we present and validate a multiscale modeling methodology for the prediction of filter pressure loss depending on the monolith channel geome...

Charvát, Jiří , Mazúr, Petr , Dundálek, Jan , Pocedič, Jaromír , Vrána, Jiří , Mrlík, Jindřich , Kosek, Juraj , Dinter, Saskia
Performance enhancement of vanadium redox flow battery by optimized electrode compression and operational conditions

Two different commercial carbon felt electrodes for vanadium redox flow battery, based on polyacrylonitrile and rayon, are tested and compared in order to evaluate the effect of felt compression on the battery performance in terms of cell polarization and pressure drop through the ...

Belloň, Tomáš , Slouka, Zdeněk
Overlimiting behavior of surface-modified heterogeneous anion-exchange membranes

Electrochemical and electrokinetic behavior of ion-exchange systems as a result of electrostatic interactions between the fixed charge and the ionic species present in the electrolyte can significantly vary with the type of electrolyte and the membrane composition. In this paper, we studied&...

Plachá, Marie , Kočí, Petr , Isoz, Martin , Svoboda, Miloš , Price, Emily , Thompsett, David , Kallis, Kyriakos X. , Tsolakis, Athanasios
Pore-scale filtration model for coated catalytic filters in automotive exhaust gas aftertreatment

In this paper we explore the impact of catalyst distribution on the filtration efficiency of automotive exhaust gas filters (GPF and DPF). The structure of filter wall is reconstructed from 3D X-ray tomography (XRT), including spatial distribution of catalytic material. The filtration p...

Polezhaev, Petr , Belloň, Tomàš , Kurospajeva, Nazerke Chroust , Vobeckà, Lucie , Slouka, Zdeněk
Molecular sieving of tetraalkylammonium cations on cation exchange systems in DC electric field

Ion exchange membranes and ion exchange resin particles are widely used in electro-membrane separation processes such as electrodeionization and electrodialysis. The internal structure of these ion exchange systems implicitly determines their properties, which, in turn, strongly affect the efficiency ...

Konopka, Ladislav , Jantač, Simon , Vrzáček, M. , Svoboda, Miloš , Kosek, Juraj
Triboelectric charging of polyethylene powders: Comparison of same-material and different-material

The understanding of triboelectric charging of industrially important powders can help in avoiding or controlling the particle agglomeration and wall sheeting. We developed a new experimental approach to study both same material particle-particle (P-P) and different-material particle-wall (P-W) charging&#x...

Kovář, Petr , Tichý, David , Slouka, Zdeněk
Effect of channel geometry on ion-concentration polarization-based preconcentration and desalination

Polarization of the ion-selective systems results in the formation of ion-depleted and ion-concentrated zones in the electrolyte layers adjacent to the system. One can employ ion-concentration polarization for the removal of chargedlarge molecules and small ions from the flowing liquid. Removal&#...

Mazúr, Petr , Mrlík, Jindřich , Charvát, Jiří , Pocedič, Jaromír , Vrána, Jiří , Dundálek, Jan , Kosek, Juraj
A complex four-point method for the evaluation of ohmic and faradaic losses within a redox flow battery single-cell

We propose a complex 4-point method for characterization of flow batteries. The distribution of ohmic and faradaic losses within a single-cell is evaluated from electrochemical impedance spectra and load curves of positive and negative half-cells measured with platinum wire pseudo-reference elect...

Collection's Items (Sorted by Submit Date in Descending order): 1 to 16 of 16