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Wyszukujesz frazę "82.80.Fk" wg kryterium: Temat

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    Wyświetlanie 1-10 z 10
    Tytuł:
    The Superior Surface Discharge Capacity of Core-Shell Tinoxide/Multi Walled Carbon Nanotube Nanocomposite Anodes for Li-Ion Batteries
    Autorzy:
    Akbulut, H.
    Alaf, M.
    Gultekin, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1218746.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.uj
    61.48.De
    82.47.Aa
    82.80.Fk
    Opis:
    In this study, tin/tinoxide/multiwalled carbon nanotube (Sn/$SnO_2$/MWCNT) nanocomposites were produced as anode materials for Li-ion batteries by a two-step process. Metallic tin was evaporated onto free-standing MWCNT buckypapers having controlled porosity and subsequently rf plasma oxidized in Ar:$O_2$ (1:1) gas mixture. Besides, Sn/$SnO_2$ nanocomposites were produced in the same conditions onto stainless steel substrates to make a comparison. X-ray diffraction and scanning electron microscopy were used to determine the structure and morphology of the obtained nanocomposites. The discharge/charge tests, cyclic voltammetry and electrochemical impedance spectroscopy were carried out to characterize the electrochemical properties of these composites. Promising results were obtained in the tin based MWCNT nanocomposites for next-generation micro battery applications because of the high active surface area of the $SnO_2$/MWCNT core-shell structures.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 335-337
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrochemical Characterization of Ca₆₅Mg₁₅Zn₂₀ Amorphous Alloy in Selected Physiological Fluids
    Autorzy:
    Babilas, R.
    Szyba, D.
    Kania, A.
    Pilarczyk, W.
    Nowosielski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1029772.pdf
    Data publikacji:
    2018-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    64.70.pe
    68.35.bd
    82.45.Bb
    82.80.Fk
    Opis:
    The corrosion behavior of the bulk glassy samples of Ca₆₅Mg₁₅Zn₂₀ alloy was studied by electrochemical measurements and immersion tests in a simulated body fluid, physiological fluid, and the Ringer solution. The results of immersion show that the volume of H₂ evolved after 2 h in simulated body fluid (29.8 ml/cm²) is the highest in comparison with the results of measurements conducted in physiological fluid (11.3 ml/cm²) and the Ringer solution (7.4 ml/cm²). The electrochemical measurements indicated a shift of the corrosion potential (E_{corr}) from -1.58 V for plate tested in a physiological fluid to -1.56 V and -1.54 V for samples immersed in the Ringer solution and simulated body fluid, adequately. The X-ray diffraction measurements were used to determine composition of corrosion products. The corrosion products were mainly identified to be calcium carbonates and calcium/magnesium hydroxides.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 2; 228-231
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrochemical Impedance of Sn Nanowire Arrays
    Autorzy:
    Kaya, H.
    Aydogmus, E.
    Avcu, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1218401.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.Gf
    81.15.Pq
    82.80.Fk
    Opis:
    In this study, Sn nanowires were produced electrochemically in anodic aluminum oxide membranes. During the deposition process some parameters such as ion content, pH, deposition time, and temperature of solution were kept constant. The scanning electron microscope results showed that the diameters of produced tin nanowires were approximately 300 nm and their lengths were about 8-10 μm. Electrochemical impedance studies of Sn nanowire arrays were also studied by Iviumstat galvanostat/potentiostat system.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 307-309
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modification of Expanded Graphite Electrodes by Ozone Treatment
    Autorzy:
    Krawczyk, P.
    Skowroński, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1536410.pdf
    Data publikacji:
    2010-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.45.Fk
    82.47.-a
    82.44.Wx
    82.80.Fk
    Opis:
    The aim of the present work was the modification of the electrochemical properties of expanded graphite by ozone treatment. Electrochemical investigations showed that ozone modification of expanded graphite electrodes results in the significant improvement of their electrochemical activity towards the phenol carried out by cyclic voltammetry method in alkaline solution. The highest activity demonstrates sample expanded graphite modified under ozone atmosphere at elevated temperature. The analysis of Fourier transform infrared spectra and voltammetric curves recorded in electrolyte without phenol additive showed increased concentration of different types of oxygen functional groups on the surface of modified expanded graphite.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 3; 465-470
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectroscopic Characterization of Titanium Alloy Surface in a Biological Medium
    Autorzy:
    Nouicer, E.
    Benlahreche, F.
    Nouicer, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030371.pdf
    Data publikacji:
    2017-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.45.Bb
    82.80.Fk
    Opis:
    This work is aimed to study the effect of a biological medium simulated body fluid on surface modification of titanium alloy Ti6Al4V. Electrochemical techniques and the Raman spectroscopy are used. Polarization curves, plotted at different scan rates (5, 1, 0.5, and 0.2 mV/s), show a large range of passivation (above 3000 mV), with no occurrence of transpassivation. The return sweep shows the negative hysteresis with the shift of the corrosion potential in the more noble direction. The corrosion current is generally very low. These observations clearly confirm the high stability of the TiO₂ passive film. The Raman spectroscopy shows that titanium dioxide formed consists of rutile phase. It was found that the scan rate has not a significant effect on the passivation phenomenon. However, it influences the corrosion potential and the current density. Electrochemical impedance spectroscopy allowed to establish the Nyquist diagrams and Bode around the equilibrium potential, and at different imposed potentials in the passivation field. The system behavior is not purely capacitive and so it is necessary to take in consideration the constant phase element. The impedance diagrams at different imposed potentials on the passivation field are composed only of a single loop.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 1; 28-31
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ion Beam Formation of Electrocatalysts for Direct Methanol and Ethanol Fuel Cells on the Basis of Carbon Catalyst Supports
    Autorzy:
    Poplavsky, V.
    Dorozhko, A.
    Luhin, V.
    Matys, V.
    Zukowski, P.
    Czarnacka, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033764.pdf
    Data publikacji:
    2017-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.37.Hk
    81.15.Jj
    81.05.U-
    82.45.Jn
    82.80.Fk
    82.80.Yc
    88.20.ff
    88.30.pd
    88.30.pf
    Opis:
    Ion-beam modification of materials whose service properties are mainly controlled by the surface composition is of especial interest, in particular, for electrocatalysts, namely electrodes of fuel cells - perspective chemical current sources. A catalyst is needed for effective operation of fuel cell. In this paper active layers of the electrocatalysts were prepared by ion beam assisted deposition of catalytic (platinum) and activating (cerium) metals onto carbon (AVCarb® Carbon Fiber Paper P50 and Toray Carbon Fiber Paper TGP-H-060 T) catalyst supports. Formation of layers by ion beam assisted deposition by means of the deposition of metal and mixing of precipitating layer with the substrate by accelerated ions of the same metal, was carried out. Metal deposition and mixing between the precipitable layer and surface of the substrate by accelerated (U=10 kV) ions of the same metal were conducted from a neutral vapor fraction and plasma of vacuum arc discharge of a pulsed electric arc ion source. Study of the morphology and composition of layers was carried out by the scanning electron microscopy, energy dispersive X-ray microanalysis, X-ray fluorescence analysis, and the Rutherford backscattering spectrometry methods. According to the investigations with the use of cyclic voltammetry, the electrocatalysts with the prepared layers exhibited catalytic activity in the reactions of electrochemical oxidation of methanol and ethanol, which form the basis for the principle of operation of low temperature direct methanol and direct ethanol fuel cells.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 2; 278-282
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes of the Electrode Surface Roughness Induced by High-Voltage Electric Pulses as Revealed by AFM
    Autorzy:
    Rodaitė-Riševičienė, R.
    Saulis, G.
    Snitka, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807928.pdf
    Data publikacji:
    2009-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.80.-y
    82.45.Fk
    68.37.Ps
    Opis:
    The changes of the surface topography of stainless-steel and aluminium electrodes occurring due to the action of electric pulses which are utilized for cell electroporation, have been studied by using atomic force microscopy. The surfaces of the polished stainless-steel electrodes were smooth - the average roughness was 13-17 nm and the total roughness 140-180 nm. The total roughness of the aluminium electrodes was about 320 nm. After the treatment of the chambers filled with 154 mM NaCl solution by a series of short (20-40 μs), high-voltage (4 kV) pulses with the total dissolution charge of 0.20-0.26 A s/$cm^{2}$, the roughness of the surface of the electrodes has increased, depending on the total amount of the electric charge that has passed through the unit area of the electrode. Up to a two- and threefold increase of the surface roughness of the stainless-steel and aluminium anodes respectively was observed due to the dissolution of the anode material. Therefore, the use of high-voltage electric pulses leads to the increase of the inhomogeneity of the electric field at the electrode, which facilitates the occurrence of the electric breakdown of the liquid samples and causes non-equal treatment of each cell.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 6; 1095-1097
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Construction and Characterisation of Double Layer Capacitors
    Autorzy:
    Stević, Z.
    Rajčić-Vujasinović, M.
    Bugarinović, S.
    Dekanski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1550614.pdf
    Data publikacji:
    2010-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.47.Uv
    82.45.Fk
    82.80.Fk
    01.50.hv
    01.50.Kw
    01.50.Lc
    01.50.Pa
    Opis:
    Electrochemical double-layer capacitor (also called supercapacitor) is an electrochemical energy storage device with a high power density, which could be used in application such as pulse power devices or electric vehicles. The paper describes construction of an electrochemical double-layer capacitor that consists of two electrodes immersed in an electrolyte with a separator between them. One electrode consists of a current collector in contact with the active material, while the other one is a counter electrode. Commercially available activated carbon (AC) material, composite $RuO_{2}$ + AC and natural copper sulfides are used as the active electrode material. Characterization has been performed by an electrochemical system fully developed at Technical Faculty in Bor. The system is based on a PC P4, a commercially available ADDA converter and an external interface for analog signal processing. The software platform is LabVIEW 8.2 package and application software is adapted to investigations of the systems containing high capacitances.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 1; 228-233
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrochemical Behaviour of $V_{2}O_{5}$ Xerogel and $V_{2}O_{5}$ Xerogel/C Composite in an Aqueous $LiNO_{3}$ and $Mg(NO_{3})_{2}$ Solutions
    Autorzy:
    Stojković, I.
    Cvjetićanin, N.
    Marković, S.
    Mitrić, M.
    Mentus, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1538117.pdf
    Data publikacji:
    2010-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.47.Aa
    71.20.Tx
    82.45.Yz
    82.80.Fk
    65.40.gk
    Opis:
    We synthesized both the $V_{2}O_{5}$ xerogel and the composite $V_{2}O_{5}$ xerogel/C starting from the solution of $V_{2}O_{5}$ in hydrogen peroxide. After the characterization by XRD, thermal (TGA-DTA), SEM methods and by particle size analysis, the investigation of $Li^{+}$ and $Mg^{2+}$ intercalation/deintercalation reactions in an aqueous solutions of $LiNO_{3}$ and $Mg(NO_{3})_{2}$ were performed by cyclic voltammetry. The composite material $V_{2}O_{5}$ xerogel/C displayed relatively high intercalation capacity, amounting to 123 mA h $g^{-1}$ and 107 mA h $g^{-1}$, in lithium and magnesium salt solutions, respectively.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 5; 837-840
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Electrocatalytic Properties of Pt/Mo - Expanded Graphite Composite Derived from Graphite Intercalation Compound
    Autorzy:
    Urbaniak, J.
    Skowroński, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1535895.pdf
    Data publikacji:
    2010-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.47.Gh
    82.80.Fk
    Opis:
    In the present work, electrocatalytic properties of Pt-EG and Pt/Mo-EG composite electrodes are studied. These composites were prepared by a three-step synthesis. First, stage-1 $HClO_4$-GIC was synthesized using the chronopotentiometric method. Then, $HClO_4$-GIC was heat treated to obtain expanded graphite. Finally, expanded graphite was coated with platinum catalyst from a water-alcohol solution of $H_2PtCl_6$. $MoCl_5$-GIC synthesized in parallel was subjected to thermal exfoliation to get Mo-EG composite onto which platinum catalyst was dispersed. The X-ray diffraction and energy dispersive X-ray analyses coupled with scanning electron microscopy were applied for characterizing the obtained GICs and EG-based composites, whereas cyclic voltammetry was used to study electrocatalytic properties of Pt/EG and Pt/Mo-EG composite electrodes in sulfuric acid and sulfuric acid admixed with methanol.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 3; 442-446
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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