scholarly journals Haloplumbate salts as reagents for the non-aqueous electrodeposition of lead

RSC Advances ◽  
2016 ◽  
Vol 6 (77) ◽  
pp. 73323-73330 ◽  
Author(s):  
Philip N. Bartlett ◽  
Jennifer Burt ◽  
Mahboba M. Hasan ◽  
Andrew L. Hector ◽  
William Levason ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Supporting Electrolyte ◽  
Pt Electrodes ◽  
Aqueous Electrodeposition

Cyclic voltammetry experiments on the Pb(ii) salts, [PPh4][PbX3] (X = Cl, Br, I) in CH2Cl2 solution ([PPh4]X supporting electrolyte) at Pt electrodes show reproducible nucleation and stripping features consistent with reduction to elemental Pb.

scholarly journals Nucleation/Growth and Optical Proprieties of Co-doped ZnO Electrodeposited on ITO Substrate

2021 ◽  
Vol 12 (5) ◽  
pp. 6776-6787
Keyword(s):  
Cyclic Voltammetry ◽  
Growth Mechanism ◽  
Supporting Electrolyte ◽  
Saturated Calomel Electrode ◽  
Nucleation And Growth ◽  
Visible Range ◽  
Zno Films ◽  
Doped Zno ◽  
Nucleation And Growth Mechanism ◽  
Co Doped

A Co-doped ZnO layer was prepared by electrodeposition method on indium doped tin oxide (ITO) substrate using a cathodic reduction from nitrate medium with different doping percentages of cobalt. The bath temperature was controlled at 70 °C. The films were cathodically electrodeposited in a bath containing 5 mM Zn(NO3)2. 6H2O, while the source of Co is Co(NO3)2.6H2O where 0.1M KNO3 was used as supporting electrolyte. The nucleation and growth mechanism of Co-doped ZnO nuclei have been studied by cyclic voltammetry and chronoamperometry. The cyclic voltammetry shows that the electrodeposition of ZnO and Co-doped ZnO at a negative potential around -1.0 V versus saturated calomel electrode (SCE) is a quasi-reversible reaction controlled by the diffusion process. Comparing current transients curves obtained by the chronoamperometric method with the theoretical curves of current density j versus t ½ allows us to say that the nucleation is 3D instantaneous, as shown in SEM analysis. The presence of Co does not modify the nucleation and growth mechanism. The XRD patterns show that the substitution of zinc by cobalt does not change the würtzite crystal structure, but the crystallite size decreases with the cobalt percentage. The transmittance spectra indicate that the Co-doped ZnO films are transparent in the visible range. The optical gap increases with the doping percentage of cobalt.

scholarly journals Effects of State of Charge on the Physical Characteristics of V(IV)/V(V) Electrolytes and Membrane for the All Vanadium Flow Battery

Batteries ◽  
2020 ◽  
Vol 6 (4) ◽  
pp. 49
Author(s):  
Wyndom S. Chace ◽  
Sophia M. Tiano ◽  
Thomas M. Arruda ◽  
Jamie S. Lawton
Keyword(s):  
Cyclic Voltammetry ◽  
Rotational Diffusion ◽  
Supporting Electrolyte ◽  
State Of Charge ◽  
Vanadium Redox Flow Battery ◽  
Bulk Solution ◽  
Flow Battery ◽  
Vanadium Concentration ◽  
H2so4 Concentration ◽  
Order Of Magnitude

The VO2+/VO2+ redox couple commonly employed on the positive terminal of the all-vanadium redox flow battery was investigated at various states of charge (SOC) and H2SO4 supporting electrolyte concentrations. Electron paramagnetic resonance was used to investigate the VO2+ concentration and translational and rotational diffusion coefficient (DT, DR) in both bulk solution and Nafion membranes. Values of DT and DR were relatively unaffected by SOC and on the order of 10−10 m2s−1. Cyclic voltammetry measurements revealed that no significant changes to the redox mechanism were observed as the state of charge increased; however, the mechanism does appear to be affected by H2SO4 concentration. Electron transfer rate (k0) increased by an order of magnitude (10−6 ms−1 to 10−8 ms−1) for each H2SO4 concentrations investigated (1, 3 and 5 M). Analysis of cyclic voltammetry switching currents suggests that the technique might be suitable for fast determination of state of charge if the system is well calibrated. Membrane uptake and permeability measurements show that vanadium absorption and crossover is more dependent on both acid and vanadium concentration than state of charge. Vanadium diffusion in the membrane is about an order of magnitude slower (~10−11 m2s−1) than in solution (~10−10 m2s−1).

Kinetics of electroreduction of Zn2+ at mercury in nonaqueous solutions

1994 ◽  
Vol 72 (7) ◽  
pp. 1691-1698 ◽  
Author(s):  
Mariléa Manzini ◽  
Andrzej Lasia
Keyword(s):  
Cyclic Voltammetry ◽  
Charge Transfer ◽  
Supporting Electrolyte ◽  
Donor Number ◽  
Nonaqueous Solutions ◽  
Dc Polarography ◽  
One Step ◽  
A Charge ◽  
Tetraethylammonium Perchlorate ◽  
Kinetics Of

The electroreduction of Zn2+ was studied in propylene carbonate (PC), acetonitrile (ACN), and hexamethylphosphoramide (HMPA) on mercury at various concentrations of tetraethylammonium perchlorate as a supporting electrolyte using dc polarography, cyclic voltammetry, chronoamperometry, and ac polarography. It was found that in PC and ACN the electroreduction process proceeds in one step. In HMPA, however, the electroreduction proceeds through a CEE mechanism in which a chemical reaction is followed by a charge transfer in two steps. The heterogeneous rate constants, corrected for the double layer effects, decrease with increase in the solvent donor number. The electroreduction process proceeds through the cation transfer mechanism.

scholarly journals Electrochemical Oxidation of Paracetamol Mediated byMgB2Microparticles Modified Glassy Carbon Electrode

2011 ◽  
Vol 8 (2) ◽  
pp. 553-560 ◽  
Author(s):  
Mohammed Zidan ◽  
Tan Wee Tee ◽  
A. Halim Abdullah ◽  
Zulkarnain Zainal ◽  
Goh Joo Kheng
Keyword(s):  
Cyclic Voltammetry ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Supporting Electrolyte ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Diffusion Controlled ◽  
Scan Rate ◽  
Degree Of Stability ◽  
A Current

A MgB2microparticles modified glassy carbon electrode (MgB2/GCE) was fabricated by adhering microparticles of MgB2onto the electrode surface of GCE. It was used as a working electrode for the detection of paracetamol in 0.1 M KH2PO4aqueous solution during cyclic voltammetry. Use of the MgB2/GCE the oxidation process of paracetamol with a current enhancement significantly by about 2.1 times. The detection limit of this modified electrode was found to be 30 μM. The sensitivity under conditions of cyclic voltammetry is significantly dependent on pH, supporting electrolyte, temperature and scan rate. The current enhancement observed in different electrolytic media varied in the following order: KH2PO4> KCl > K2SO4> KBr. Interestingly, the oxidation of paracetamol using modified GC electrode remain constant even after 15 cycling. It is therefore evident that the MgB2modifiedGCelectrode possesses some degree of stability. A slope of 0.52 dependent of scan rate on current indicates that the system undergoes diffusion-controlled process.

scholarly journals Methanol electrooxidation on PtRu modified zeolite X

2013 ◽  
Vol 45 (1) ◽  
pp. 89-96 ◽  
Author(s):  
Z. Mojovic ◽  
T. Mudrinic ◽  
Abu Rabi-Stankovic ◽  
A. Ivanovic-Sasic ◽  
S. Marinovic ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Cyclic Voltammetry ◽  
Noble Metal ◽  
Metal Clusters ◽  
Supporting Electrolyte ◽  
Solid Support ◽  
Methanol Electrooxidation ◽  
Metal Acetylacetonates ◽  
Zeolite X ◽  
Scan Rate

Zeolite NaX (faujasite type) was used as a support for platinum-ruthenium catalyst. A procedure for thermal decomposition of noble metal acetylacetonates to deposit noble metal clusters on the surface of solid support was adapted by authors to introduce noble metal clusters in zeolite cavities. The effectiveness of this composite material for methanol electrooxidation from alkaline solution was investigated by cyclic voltammetry. The influence of the concentration of supporting electrolyte, scan rate and rotation rate on the reaction of methanol oxidation was investigated. The obtained activity was compared with literature data for similar catalysts.

scholarly journals THE SYNTHESIS OF A NOVEL BIBENZOPYRAN RELIED ON ELECTROOXYDATION OF MALLOAPELTA B BY CYCLIC VOLTAMMETRY

2017 ◽  
Vol 24 (4) ◽  
pp. 387-392
Author(s):  
Phan Thi Binh ◽  
Bui Hai Ninh ◽  
Chau Van Minh ◽  
Nguyen Hoai Nam ◽  
Le Mai Huong ◽  
...  
Keyword(s):  
Hepatocellular Carcinoma ◽  
Cyclic Voltammetry ◽  
Cell Lines ◽  
Cancer Cell ◽  
Structure Determination ◽  
Supporting Electrolyte ◽  
Cancer Cell Lines ◽  
Spectral Measurements ◽  
Nmr Studies ◽  
Mass Spectral

A novel bibenzopyran named bimalloapelta (1) was synthesized relying on electrooxydation of malloapelta B by cyclic voltammetry in acetonitril adding LiClO4 0.1 M as supporting electrolyte. Its structure determination based on extensive NMR studies and ESI mass spectral measurements. The new compound showed significant cytotoxicity againsts two cancer cell lines as human hepatocellular carcinoma (Hep-2; IC50: 0.46 µg/m) and rhabdosarcoma (RD; IC50: 0.33 µg/m). These results were the same that of  malloapelta B  (Hep-2, IC50: 0.49 µg/ml and  KB, IC50: 0.54 µg/ml). 

Functionalization of ISE Sensor for Metal Ion Detection

2009 ◽  
Vol 609 ◽  
pp. 249-254 ◽  
Author(s):  
K. Morakchi ◽  
A. Zazoua ◽  
A. Hamel ◽  
Saida Zougar ◽  
R. Kherrat ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Cyclic Voltammetry ◽  
Working Conditions ◽  
Metal Ion ◽  
Platinum Electrode ◽  
Polymeric Membrane ◽  
Mercury Ions ◽  
Pt Electrodes ◽  
Metal Ion Detection ◽  
Voltammetry Methods

In this work, we report the study of functionalized platinum (Pt) electrodes based on a polymeric membrane (PVC) including an ionophore (ethyln diamin tetracetic EDTA) sensitive for mercury ions Hg2+. The optimised working conditions of the sensors have been studied with regard to the sensitivity performances; in particular, the polarisation was adjusted to - 0.2V/SCE. Ion sensitivity of sensors have been tested for Hg(II) via Cd(II) in aqueous solution. A layer of EDTA deposited on platinum electrode has been characterised by impedance spectroscopy and cyclic voltammetry methods.

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