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61.
K. Juodkazis J. Juodkazytė R. Vilkauskaitė V. Jasulaitienė 《Journal of Solid State Electrochemistry》2008,12(11):1469-1479
The processes of nickel surface anodic oxidation taking place within the range of potentials preceding oxygen evolution reaction
(OER) in the solutions of 1 M KOH, 0.5 M K2SO4, and 0.5 M H2SO4 have been analyzed in the present paper. Metallic nickel, thermally oxidized nickel, and black nickel coating were used as
Ni electrodes. The methods of cyclic voltammetry and X-ray photoelectron spectroscopy were employed. The study was undertaken
with a view to find the evidence of peroxide-type nickel surface compounds formation in the course of OER on the Ni electrode
surface. On the basis of experimental results and literature data, it has been suggested that in alkaline solution at E ≈ 1.5 V (RHE) reversible electrochemical formation of Ni(IV) peroxide takes place according to the reaction as follows: This reaction accounts for both the underpotential (with respect to ) formation of O2 from NiOO2 peroxide and also small experimental values of dE/dlgi slope (<60 mV) at low anodic current densities, which are characteristic for the two-electron transfer process. It has been
inferred that the composition of the γ-NiOOH phase, indicated in the Bode and revised Pourbaix diagrams, should be ∼5/6 NiOOH + ∼1/6
NiOO2. The schemes demonstrating potential-dependent transitions between Ni surface oxygen compounds are presented, and the electrocatalytic
mechanisms of OER in alkaline, acid, and neutral medium have been proposed. 相似文献
62.
Povilas Virbickas Gerda Ziziunaite Arunas Ramanavicius Aušra Valiūnienė 《Electroanalysis》2023,35(4):e202200230
In this research a Hg2+ ion biosensor was developed by combining Prussian blue (PB) with glucose oxidase (GOx) – an enzyme that can be inhibited by Hg2+ ions. An application of PB in the design of Hg2+ ion biosensor enabled detecting changes in hydrogen peroxide reduction current at low operational potential of 0.2 vs Ag|AgCl,KClsat. The described Hg2+ ion biosensor exhibited wide linear range from 27 μM to 247 μM of Hg2+ and higher maximal detectable concentration of Hg2+ than other GOx inhibition-based biosensors, making it convenient for the analysis of samples with high concentration of Hg2+ ions. 相似文献
63.
Mira S. Bjelakovi? Natalija M. Krsti? Aleksej Kruni? Milan M. Dabovi? 《Tetrahedron》2009,65(46):9557-9568
In this paper a synthetic pathway to the modified 5,10:13,14-bisfragmentation cholestane derivatives 8-14 is described. The synthesis involves introduction of the 5α- and 14α-hydroxyl groups in the cholestane molecule and subsequent cleavage of the C(5)-C(10) bond in 5α,14α-dihydroxycholestan-3β-yl acetate (4) with the HgO/I2 reagent and the C(13)-C(14) bond in the stereoisomeric 14α-hydroxy-5,10-secosteroids 5 and 6 with the Pb(OAc)4/I2 reagent. Complete and unambiguous 1H and 13C NMR resonance assignments of the obtained secosteroids, as well as the solution conformations of their 10- and 9-membered rings were determined by extensive analysis of 1D and 2D NMR spectral data. The structures and the solid-state conformations of 5,10-secosteroids 5-7 were confirmed by X-ray analysis. All diseco-compounds have a novel 5,10:13,14-disecocholestane skeleton. 相似文献
64.
Rima Tarozaitė Loreta Tamašauskaitė Tamašiūnaitė Vitalija Jasulaitienė 《Journal of Solid State Electrochemistry》2009,13(5):721-731
Platinum–tin complexes were prepared by the reduction of Pt(IV) with Sn(II) in HCl media and studied by light absorption spectrometry,
X-ray photoelectron spectroscopy (XPS), and electron microscopy. The formation of three complexes, H3[Pt(SnCl3)5], H2[Pt(SnCl3)2Cl2], and H2[Pt3(SnCl3)8], depending on HCl and SnCl2 concentrations, has been shown. The glassy carbon (GC) electrode modified in the complexes solutions was found to be an electrocatalyst
for borohydride oxidation in a 1.0-M NaOH solution. Comparison of BH4
− electrooxidation on Pt and on GC modified with platinum–tin complexes has shown that catalytic hydrolysis of BH4
− did not proceed in the latter case in contrast to its oxidation on the Pt electrode, and only direct BH4
− oxidation has been observed in the positive potentials scan. The activity of Pt–Sn complexes for BH4
− oxidation changes with time and eventually decreases due to Sn(II), bound in the complex with Pt(II), oxidation by atmospheric
oxygen. The complexes may be renewed by addition of missing amounts of SnCl2 and HCl. 相似文献
65.
Remigijus Ivanauskas Ingrida Ancutienė Vitalijus Janickis Rūta Stokienė 《Central European Journal of Chemistry》2009,7(4):864-869
The process of obtaining semiconductive and electrical conductive layers of copper sulfides by the sorption — diffusion method
on polymers (polyamide 6 and low density polyethylene) using solutions of potassium pentathionate, K2S5O6, and higher polythionic acids, H2S
n
O6 (n = 21, 33), was investigated. The layers were characterized for compositional and electrical properties by X-ray diffraction
(XRD) analysis and sheet resistance measurements. The thickness of copper sulfides layers on polyamide and polyethylene increased
with increasing time of polymer sulfurization and varied from 10 to 43 μm. The variations of the sheet resistance of copper
sulfides layers formed on the surface of polymers on sulfurization agent used, the conditions of sulfurization, chemical and
phase composition of the obtained layers were established. Sheet resistance of copper sulfides layers decreases with increasing
time of the duration of sulfurization and the number of sulfur atoms in the polythionate anion. The sheet resistance values
for copper sulfide layers formed on the polyamide surface are much lower than those of Cu
x
S formed on the polyethylene surface. XRD showed the predomination of Cu
x
S phases with low x values.
相似文献
66.
We obtain a joint universality theorem for periodic Hurwitz zeta-functions under weaker hypotheses than those in the previous
papers of the first author. 相似文献
67.
Andrius Garbaras Justina Šapolaitė Inga Garbarienė Žilvinas Ežerinskis Agnė Mašalaitė-Nalivaikė Raminta Skipitytė 《Isotopes in environmental and health studies》2018,54(5):463-474
In the present study, a combination of the stable carbon isotope ratio (13C/12C) with radiocarbon data (14C) allowed us to perform the aerosol source apportionment. Filter samples of PM1 were collected during the warm and cold periods in rural and urban sites in Lithuania. The 14C/12C ratio of total carbon (TC) was measured using the single stage accelerator mass spectrometer quantifying of fossil and non-fossil derived aerosol emissions. The δ13C value was measured using an elemental analyser interfaced with an isotope ratio mass spectrometer. We have found that the highest fraction of contemporary carbon (fc?=?0.82) was measured during a warm period in a rural location. A higher fraction of fossil fuel-derived carbon was observed for air masses transported from highly industrialized Western European regions during both seasons. Isotope mass balance calculations revealed that the traffic emissions composed 15 and 25?% in rural and urban sites, respectively, and did not change during either season. Input from coal-derived aerosol particles was estimated to be 15?% at an urban site during the cold period. The combination of the stable carbon isotope ratio with the radiocarbon data allowed us to distinguish coal, liquid fossil fuel combustion, and non-fossil derived aerosol particle emissions. 相似文献
68.
69.
Misiūnas A Niaura G Barauskas J Meškys R Rutkienė R Razumas V Nylander T 《Journal of colloid and interface science》2012,378(1):232-240
Small angle X-ray diffraction (SAXD), resonance Raman (RR) spectroscopy with 413 nm excitation, and non-resonance Raman technique with 785 nm excitation were used to probe the influence of entrapped cytochrome c (Cyt c) on the structure of hydrated phytantriol (Phyt) liquid-crystalline phases as well as conformational changes of heme group and secondary structure of the protein. SAXD measurements indicated that incorporation of Cyt c affects both nanostructure dimensions and type of liquid-crystalline phases of hydrated Phyt. The unit cell dimensions decrease with increasing Cyt c concentration for all phases. In addition, protein perturbs the nanostructure of Q(230) and Q(224) liquid-crystalline phases of hydrated Phyt to such an extent that they transform into the Q(229) phase with the Im3m space group. RR data revealed that entrapment of oxidized Cyt c into the Q(230) phase at 1 wt.% content results in near complete reduction of central iron ion of the heme group, while its low-spin state and six-ligand coordination configuration are preserved. Based on the analysis of heme out-of-plane folding vibration near 568 cm(-1) (γ(21)) and ν(48) mode at 633 cm(-1), it was demonstrated that the protein matrix tension on the heme group is relaxed upon incorporation of protein into Q(230) phase. Non-resonant Raman bands of difference spectra showed the preservation of α-helix secondary structure of Cyt c in the liquid-crystalline phase at relatively high (5 wt.%) content. The Cyt c induced spectroscopic changes of Phyt bands were found to be similar as decrease in temperature. 相似文献
70.
A. Krotkus V. Pačebutas J. Kavaliauskas I. Subačius K. Grigoras I. Šimkienė 《Applied Physics A: Materials Science & Processing》1997,64(4):357-360
Received: 10 May 1996/Accepted: 19 November
1996 相似文献