« Home « Kết quả tìm kiếm

Cyclic voltammogram

Tìm thấy 19+ kết quả cho từ khóa "Cyclic voltammogram"

Voltammetric analysis of disulfiram in pharmaceuticals with a cyclic renewable silver amalgam film electrode

tailieu.vn

In the next step, cyclic voltammetry was used to investigate the electrochemical behavior of DSF. 48 Moreover, slope of the log I p = f (log ν) dependence (R is equal to 0.76, and so it can be concluded that the electrode reaction is influenced by both diffusion and adsorption processes. (A) SWCSV dependence of BR buffer pH on DSF peak current, C DSF mol L − 1 . (B) Cyclic voltammogram recorded in BR buffer pH = 7.5, C DSF mol L − 1 , scan rate 50 mV s − 1.

Durability of carbon/conducting polymer composite supported Pt catalysts prepared by supercritical carbon dioxide deposition

tailieu.vn

Electrochemical characterization of the catalyst was performed using cyclic voltammetry. The corre- sponding cyclic voltammogram for HOR activity before and after the Pt degradation test is given in Figure 5. Electrochemical surface area (ESA) of the catalyst was calculated by taking into account the average of adsorption and desorption areas of the cyclic voltammograms. The change after the degradation tests was obtained by comparing the voltammograms before and after the degradation tests.

Electrochemical properties of 1,3-disubstituted methyl methoxy phenyl-5-phenylformazans and comparison with spectral properties

tailieu.vn

The cyclic voltammograms of formazans substituted with CH 3 and OCH 3 at the o−, m. and p-positions of the 1-phenyl ring and OCH 3 at the p-position of the 3-phenyl ring (2–7) are compared to the parent compound TPF (1) in Figures 1 and 2.. Cyclic voltammogram of a DMSO solution of M TPF (1) in the presence of 0.1 M TBATFB at Pt electrode. Cyclic voltammogram of DMSO solutions of M compounds a) 1–4 and b) 1, 5–7 in the presence of 0.1 M TBATFB at Pt electrode.

Investigation of electrochemical behavior of potassium ferricyanide/ferrocyanide redox probes on screen printed carbon electrode through cyclic voltammetry and electrochemical impedance spectroscopy

tailieu.vn

The cyclic voltammograms of the redox probes in the potential range of − 0.3 V and 0.5 V (vs. Different concentrations of each redox probe (0.01 mM, 0.1 mM, 1 mM, 10 mM, and 100 mM) were used in the cyclic voltammetry analyses to evaluate the concentration influence on the cyclic behavior of the SPCE-redox probe system. (a) The resulting cyclic voltammogram showing the measurement of the peak potentials.

One-step potentiostatic codeposition and electrochemical studies of poly(1-pyrenyl)-2,5-di(2-thienyl)pyrrole-co-pyrrole) film for electrochemical supercapacitors

tailieu.vn

In the first curve of the cyclic voltammogram, PyrPy exhibited two oxidation peaks at about +0.62 and +0.75 V and a reduction peak at about +0.53 V in ethanol solvent (Figure 1a). The obtained result demonstrates that P(PyrPy) film was formed on the surface of the PGE in ethanol, which was consistent with the published literature. As shown in Figure 1b, the formation of the broad oxidation and reduction peaks obtained from the cyclic voltammogram indicates the formation of polypyrrole.

Investigation of PZT-5H and PZT-8 type piezoelectric effect on cycling stability on SiMWCNT containing anode materials

tailieu.vn

(a) Cycling performance, (b) charge-discharge profiles, (c) cyclic voltammogram of Sample #1. Note: Electrodes were tested at C/5 rate in the voltage range of 0.01–1.50 V vs. piezoelectric effect loss due to the loss of polarization or (2) the side reactions. The side reactions can be attributed to PZT particle decomposition during cycling, and thus to the loss of PZT particles and decreased piezoelectric effect..

Electrochemical investigation of 2-[8-hydroxyquinoline-5-yl)azo]benzo[ c]cinnoline on a platinum electrode in dimethysulfoxide

tailieu.vn

The cyclic voltammogram of OHQAB is given in Figure 2. This figure has an anodic peak (II a ) corresponding the second reduction peak (II c ) of OHQAB close to reversibility. This shows that there might be a radical formation in the electrode reaction.

Spectral, electrochemical, luminescence, and dye-sensitized solar cell studies of mono and d-f hetero binuclear cryptates

tailieu.vn

The cyclic voltammogram of mononuclear complex [Gd(H 3 L)(NO 3 ) ].2H 2 O in DMF in the range 0.0 to –2.50 V at the scan rate of 0.05 V s − 1 is given in Figure 5, which shows well-defined cathodic peak potential of E pc = –1.95 V (Ag/AgCl). The ratio of the anodic to cathodic peak currents i pa /i pc was close to unity at low scan rates.

Electrodeposited Gold Nanoparticles Modified Screen Printed Carbon Electrode for Enzyme-Free Glucose Sensor Application

tailieu.vn

Pasta [13], the cyclic voltammogram (CV) of electrodeposited Au nanoparticles modified SPCE in KOH 0.1M in the absence of glucose one can see two electrochemical processes related to gold hydroxide formation and reduction. Peak around -0.3 V is attributed to the electrochemical adsorption of hydroxide ion on the surface of Au nanoparticles and the peak at 0.3 V is the formation of gold oxide.

Synthesis and electrochemistry of phthalocyanines bearing [(3,4-dimethoxybenzyl)oxy] groups

tailieu.vn

Figure 7 shows the cyclic voltammogram of the prepared cobalt phthalocyanine in. The two reduction couples labeled R 1 and R 2 that are observed at –0.37 V and –1.43 V respectively may be assigned to [Co II Pc 2 − ]/[Co I Pc 2.

Electrochromic properties of PANI/TiO2 nanocomposite films prepared by electropolymerization

tailieu.vn

Keywords: Electrochromic device, PANI/nc-TiO 2 , Electrochemical deposition, Cyclic voltammogram, Coloration efficiency.. https//doi.org vnumap.4614. Durability of the EC devices was demonstrated in performing several tens of thousands of coloration/bleaching cycles, and the device optical properties were found to be unchanged for many hours. The PANI-copolymer/ITO electrode has electrochromic display of the inverse change of green-to-blue light.

Fabrication of layer-by-layer deposited films containing carbon nanotubes and poly(malachite green) as a sensor for simultaneous determination of ascorbic acid, epinephrine, and uric acid

tailieu.vn

This part of the voltammogram, known as the Tafel region, 49 is affected by electron transfer kinetics between the substrate (EP) and the PMG/MWCNT (Figure 7). In this condition, the number of electrons involved in the rate-determining step can be estimated from the slope of the Tafel plot. current log I for rising part of cyclic voltammogram for oxidation of EP at the surface of PMG/MWCNT/GCE at a scan rate 10 mV s −1.

Assessment of ligninolytic bacterial consortium for the degradation of azo dye with electricity generation in a dual-chambered microbial fuel cell

tailieu.vn

To study the electrocatalytic electron transfer in the anode chamber of the MFC, the oxidation-reduction of mediators or substrates in the anode chamber was monitored using cyclic voltammetry. A comparative cyclic voltammogram of the anode chamber is shown in Fig. The difference of the anolyte performance before and after the bac- terial consortium treatment process was observed at a scan rate of 20 mV/s.

The interaction between a zinc(II) phthalocyanine compound bearing octakis phenoxyacetamide substituents and calf thymus DNA

tailieu.vn

The results of cyclic voltammogram studies demonstrated successive decreases in peak current and the change in peak potential of the PcZn complex indicated that CT-DNA interacts with the zinc(II) phthalocyanine complex. Similarly, the findings of the gel electrophoresis study showed that PcZn interacts with CT-DNA. In this study, octaphenoxyacetamidephthalocyaninatozinc(II) 17 was used to investigate its interaction with CT- DNA.

An ionic liquid/bismuth film-modified sensor for the electrochemical detection of cefixime

tailieu.vn

Inset: repetitive cyclic voltammogram of 10 µM CFE at IL/Bi/PGE.. When these features were combined, the IL/Bi composite exhibited a remarkable increment of CEF’s anodic peak current. The enhancement in the peak current may be attributed to the presence of IL on Bi film, which provided a conductive and stable electrochemical surface for the CEF to be adsorbed. This approach caused an increment for the voltammetric signal of CEF.

Voltammetric determination of phenmedipham herbicide using a multiwalled carbon nanotube paste electrode

tailieu.vn

Cyclic voltammetry (CV) is a useful technique for elucidating the electrochemical behavior of organic species and that of the mechanisms of electrode reactions. As shown in Figure 2, 5.0 mg/L phenmedipham gave an oxidation. Effect of the potential sweep rate on the cyclic voltammogram of 5.0 mg/L phenmedipham herbicide (pH 2.0 B–R buffer solution)..

An ultrahigh selective uric acid sensor based on SrWO4 nanocomposite using pomelo leaf extract solubilized Nafion modified glassy carbon electrode

tailieu.vn

Moreover, G-SrWO 4 /Nf modi fi ed GC electrodes could improve the ef fi cient surface area for the electrocatalytic activity, high electron transport and sensitivity for the UA detection [21].. a) Cyclic voltammogram obtained at G-SrWO 4 /Nf modified GC electrode in 10 m M UA containing different pH (pH and 8) at a scan rate of 50 mV/s (a, c) and (b) Calibration plot for the pH vs. peak potential for the detection of UA..

In silico and in vitro evaluation of the biological activity of some organic sulfur-containing compounds

tailieu.vn

As shown in Figure 2, the form of cyclic voltammogram of the electroreduction of oxygen changed in the presence of compound 3. 2 in the presence of compound 3. A decline in the anodic peak of O. 2 oxidation indicated that all of the compounds reacted irreversibly with the superoxide anion-radical. As shown in Table 2, based on the obtained voltammetric data, the rate constants (k) of the interaction of compounds 1–10 with O.

Synthesis, spectroscopic characterization, and biological screening of binuclear transition metal complexes of bicompartmental Schiff bases containing indole and resorcinol moieties

tailieu.vn

The electrochemical behavior of the Cu(II) complex (1a) was investigated in DMF (10 − 3 M) solution containing 0.05 M n -Bu 4 N-ClO 4 as a supporting electrolyte by cyclic voltammetry. The cyclic voltammogram of the Cu(II) complex (1a) (Figure 3) in DMF at a scan rate of 50 mV/s shows a well-defined redox process corresponding to the formation of Cu(II)/Cu(I) couple at E pa = –0.5925 V and E pc = –1.0123 V versus Ag/AgCl.

Synthesis, optical, and structural properties of bisphenol-bridged aromatic cyclic phosphazenes

tailieu.vn

Cyclic voltammogram of compounds 5, 6, 7, and 8.. *The band gap (Eg) was calculated from the onset absorption edge in the UV-Vis spectra of compounds 5–8 and was found as and 3.75 eV, respectively, and then the LUMO could be estimated as and –1.78 eV, respectively.. HOMO-LUMO energies of compounds 5–8 are tabulated in Table 3 and the band gap values from the DFT calculation were determined as and 4.47, respectively. The optimized geometries of compounds 5–8 are illustrated in Figure 8.