cathode Dotaz Zobrazit nápovědu

Přesná shoda Sémantické

706 záznamů v Medvik

Článek online

Scanning electron microscopy of nonconductive specimens at critical energies in a cathode lens system

Scanning. 2001 ; Roč. 23 (č. 1) : s. 36-50.

ISSN 0161-0457
Medvik
Zdroj

Článek

Cellulose-based air-cathode loaded by in-situ hydrothermally synthesized NiFe2O4 for Al-air battery: Influence of surface chemistry on the electrochemical performance

Shebl, Ahmed
Autor Shebl, Ahmed Centre for Advanced Materials Application of the Slovak Academy of Sciences, Dubravska cesta 9, 845 11 Bratislava, Slovakia Chemistry Department, Faculty of Science, Ain Shams University, Abbassia, Cairo, Egypt
Nada, Ahmed Ali
Autor Nada, Ahmed Ali Centre for Advanced Materials Application of the Slovak Academy of Sciences, Dubravska cesta 9, 845 11 Bratislava, Slovakia Pretreatment and Finishing of Cellulose Based Textiles Department, National Research Center, 12622 Giza, Egypt Polymer Institute of the Slovak Academy of Sciences, Dubravska cesta 9, 845 41 Bratislava, Slovakia. Electronic address: ahmed.nada@savba.sk
Opálek, Andrej
Autor Opálek, Andrej Institute of Materials and Machine Mechanics of the Slovak Academy of Sciences, Dubravska cesta 9, 845 13 Bratislava, Slovakia
Kleinová, Angela
Autor Kleinová, Angela Polymer Institute of the Slovak Academy of Sciences, Dubravska cesta 9, 845 41 Bratislava, Slovakia
Andicsová, Anita Eckstein
Autor Andicsová, Anita Eckstein Polymer Institute of the Slovak Academy of Sciences, Dubravska cesta 9, 845 41 Bratislava, Slovakia
Taveri, Gianmarco
Autor Taveri, Gianmarco Centre for Advanced Materials Application of the Slovak Academy of Sciences, Dubravska cesta 9, 845 11 Bratislava, Slovakia
Mrlik, Miroslav
Autor Mrlik, Miroslav Centre of Polymer Systems, University Institute, Tomas Bata University in Zlín, Trida T. Bati 5678, 76001 Zlín, Czech Republic
Osička, Josef
Autor Osička, Josef Centre of Polymer Systems, University Institute, Tomas Bata University in Zlín, Trida T. Bati 5678, 76001 Zlín, Czech Republic
Kaňková, Hana
Autor Kaňková, Hana Centre for Functional and Surface Functionalized Glass, Alexander Dubček University of Trenčín, Študentská 2, 911 50 Trenčín, Slovakia
Nagy, Štefan
Autor Nagy, Štefan Institute of Materials and Machine Mechanics of the Slovak Academy of Sciences, Dubravska cesta 9, 845 13 Bratislava, Slovakia

International journal of biological macromolecules. 2025 ; 320 (Pt 3) : 145970. [pub] 20250712

Int J Biol Macromol
ISSN 1879-0003
Medvik
Zdroj

The influence of the cellulosic fabrics (CF) surface chemistry on hosting nickel ferrite (NF) and its application in Al-air battery was studied. CFs were modified with acrylate monomer bearing positively (COOCH2CH2N+(CH3)3Cl-) or negatively (-COO(CH2)3SO3K) charged functional groups at different degrees of graft-polymerization. NF was in-situ hydrothermally synthesized into the un/grafted-CF followed by in-situ polymerization of polyaniline (PANi) to enhance the electric conductivity nine orders of magnitude. This via altering the electron transport mechanism from the tunnelling to the variable-range hopping mechanism for CF-NF and PANied-CF-NF, respectively. XRD confirmed a single phase of Trevorite (NiFe2O4). SEM images showed a dense deposition of NF on the anionic fabrics and TEM images demonstrated the change of NF shape (nanorice - nanoctahedrons) and size (9-75 nm) as a function of the surface chemistry. Anionic ACs showed higher Ni+2 and Fe+3 uptake compared to the cationic ones as confirmed by ICP-OES and XPS. Cyclic voltammetry showed that NF reduced oxygen to water through 2 × 2 electron pathway. Electrochemical performance of ACs showed a good correlation with the NF content to an extent. Highest current density (4 mA/cm2) and discharge time (13.8 h) were obtained from anionic AC compared to 1.7-2.5 h for blank and cationized ACs, respectively.

Článek online

All-printed planar photoelectrochemical cells with digitated cathodes for the oxidation of diluted aqueous pollutants

... The cells, consisting of a nanoparticular titania photoanode and a digitated, metallic cathode, were ...

Environmental science and pollution research international. 2017 ; 24 (14) : 12547-12555. [pub] 20160916

Environ. sci. pollut. res. int.
ISSN 1614-7499
Medvik
Zdroj

A novel outline of a planar photoelectrochemical cell consisting of a semiconductor layer topped by subsequent layers of a digitated insulator and counter electrode is introduced. The use of vertically separated electrodes represents a major development in reducing the footprint (inactive areas) of planar electrochemical cells. The cells, consisting of a nanoparticular titania photoanode and a digitated, metallic cathode, were fabricated by a strictly additive process employing material printing as the exclusive deposition and patterning tool. Transparent conductive oxide-coated glass and polyethyleneterepthalate sheets were used as substrates; nanocrystalline titania dispersion bonded by a novel organosilica binder was used for the fabrication of the photoanode and gold or carbon inks for the fabrication of the digitated cathodes. Due to the digitated shaping of the cathode, photoelectrochemical response was not suffering from iR drop down to low electrolyte ionic strengths. The printed cells were used for electroassisted photocatalytic degradation experiments with aqueous solutions of coumarin. Considerable acceleration of the coumarin degradation rate compared to the plain photocatalytic mode was observed.

Kniha

Rentgenky

Šváb, Ladislav
Autor Autorita

Praha : Státní nakladatelství technické literatnry, n. p., 1958

Řada elektrotechn. literatury

Vydání první 317 stran : ilustrace, tabulky ; 21 cm

Technická monografie podává soustavný výklad o teorii, konstrukci, výrobě i provozu rentgenek. Pojednáno je o hlavních typech rentgenek pro lékařské, technické a fyzikální účely.