Electrochemical Studies and Extraction of Chemical and Electrochemical Parameters of Zn(ii) Ion at Mercury Electrode via Convolutive Voltammetry and Digital Simulation Methods

El-Hallag, Ibrahim S.

doi:10.4067/s0717-97072010000300023

Cited by 9 publications

(3 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Using a nonelectrochemical method such as Rayleigh optics, Albright and Miller obtained a diffusion coefficient that is dependent on the electrolyte (ZnSO 4 concentration); at 0.004 M, the value is 8.48 × 10 –6 cm 2 /s and in 3.33 M concentration it is 2.81 × 10 –6 cm 2 /s. Using a mercury electrode as the working electrode, El-Hallag reported in chloride medium a diffusion coefficient value of 2.44 × 10 –6 cm 2 /s at 25°. In another report, the diffusion coefficient is measured as 7.03 × 10 –6 cm 2 /s in potassium nitrate solution at 25 °C.…”

Section: Resultsmentioning

confidence: 99%

Composite of Zinc Using Graphene Quantum Dot Bath: A Prospective Material For Energy Storage

Protich

Wong

Santhanam

2016

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

The electrodeposition of a zinc–graphene composite has been achieved for the first time using a graphene quantum dot (GQD) electrode. At the GQD electrode, the electrochemical reduction of zinc ion is shifted to a lesser negative potential with the complementary anodic peak due to the oxidation of the composite shifted toward a positive potential as compared to zinc ion reduction in the GQD bath. The charge ratio of anodic to cathodic peaks is one that represents a gain of nearly ten percent over the conventional Zn/Zn2+ in the energy storage systems. In galvanostatic electrolysis, the deposition of zinc–graphene composite is carried out under neutral and acidic conditions. The X-ray diffraction of the electrolytically prepared composite shows distinct features of 2 theta reflection at 8° due to (001) plane of graphene, in addition to the characteristic reflections at 38.9°,43.2°, 54.3°, 70.1° and 90° arising from Zn at (002), (100), (101), (102) and (110). A large scale preparation of the zinc–graphene composite has been achieved with a zinc plate as the working electrode in the GQD bath. The thermogravimetric analysis (TGA) of the composite shows a distinct weight loss that is due to breakdown of the composite. The interaction of GQD with zinc ion has been examined by fluorescence spectroscopy that shows quenching of the fluorescence of GQD. Scanning electron microscopy and energy dispersion X-ray analysis (EDAX) shows a string-like structure with peaks for carbon and zinc in EDAX. The electrochemical data on zinc/zinc–graphene composite reveals that it functions ideally as a charge storage material. Contact angle measurements reveal it to have hydrophilicity.

show abstract

Section: Resultsmentioning

confidence: 99%

Composite of Zinc Using Graphene Quantum Dot Bath: A Prospective Material For Energy Storage

Protich

Wong

Santhanam

2016

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…By relying on previous paradigms, related reports, and cyclic voltammetry experiments, offering a plausible mechanism (see Scheme ) was not a difficult task. Starting keys in our electrochemical reaction were the anodic oxidation of iodide ion and 1a . At first, although the formation of 5′ was well proven by previous reports, but for ensuring its formation in our applied potential, cyclic voltammetry (CV) experiments were performed (Figures 9 and 10).…”

mentioning

confidence: 94%

Electrochemical Synthesis of β-Ketosulfones from Switchable Starting Materials

Yavari

Shaabanzadeh

2020

Org. Lett.

View full text Add to dashboard Cite

A synthesis of β-ketosulfones via sulfination of aryl methyl ketones and aryl acetylenes with sodium sulfinates under mild electrochemical conditions, in moderate to good chemical yields, is described. In particular, an electrochemical sulfination reaction of alkynes with sulfinate salts has never been explored. An environmentally friendly characteristic of this reaction is that it uses electricity as a valuable energy source for electrochemical synthesis of β-ketosulfones. This strategy is more convenient and practical compared to previous approaches.

show abstract

“…There are other reports of diffusion coefficient measurements of zinc ion at 25 o C ; using nonelectrochemical method such as Rayleigh optics, Albright and Miller[40] obtained diffusion coefficient that is dependent on the electrolyte (ZnSO 4 concentration); at 0.004 M, the value is 8.48 X10 -6 cm 2 /s and in 3.33 M concentration it is 2.81X 10 -6 cm 2 /s. Using a mercury electrode as the working electrode, El-Hallag[41] reported in chloride medium a diffusion coefficient value of 2.44 X10 -6 cm 2 /s at 25…”

mentioning

confidence: 99%

A new graphene composite with a high coulombic efficiency

Protich

Wong

Santhanam

2016

Journal of Power Sources

View full text Add to dashboard Cite

Zinc-graphene composite has been electrolytically produced for the first time using a graphene quantum dot (GQD) electrode. The electrochemical reduction of zinc ion at a GQD electrode is shifted to a lesser negative potential with the complimentary anodic peak due to the oxidation of the composite shifted towards a positive potential as compared to zinc ion reduction in the GQD bath. The coulombic efficiency of the composite represents a gain of nearly 10% over the conventional Zn/Zn 2+ in the energy storage systems. In galvanostatic electrolysis, the deposition of zinc-graphene composite is carried out under neutral and acidic conditions. The Xray diffraction of the electrolytically prepared composite shows distinct features of 2 theta reflection at 8 o due to (001) plane of graphene, in addition to the characteristic reflections at 38.9 o ,43.2 o , 54.3 o , 70.1 o and 90 o arising from Zn at (002), (100), (101), (102) and (110). A large scale preparation of the zinc-graphene composite has been achieved at a zinc plate as the working electrode in the GQD bath. The composite is stable up to 250 o C. Scanning electron microscopic (SEM) and energy dispersion X-ray analysis (EDAX) shows a string like structure with peaks for carbon and zinc in EDAX.

show abstract

Electrochemical Studies and Extraction of Chemical and Electrochemical Parameters of Zn(ii) Ion at Mercury Electrode via Convolutive Voltammetry and Digital Simulation Methods

Cited by 9 publications

References 24 publications

Composite of Zinc Using Graphene Quantum Dot Bath: A Prospective Material For Energy Storage

Composite of Zinc Using Graphene Quantum Dot Bath: A Prospective Material For Energy Storage

Electrochemical Synthesis of β-Ketosulfones from Switchable Starting Materials

A new graphene composite with a high coulombic efficiency

Contact Info

Product

Resources

About