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04/24/2021

How do you calculate capacitance on a CV?

How do you calculate capacitance on a CV?

In case of supercapacitor capacitance calculated from CV by using the formula c= i/s, where i= average current and s= scan rate, how can I calculate the specific capacitance in F/g?

How is ECSA calculated?

ECSA= QH/ (mpt x 210 x 10^-6) ; where, ‘QH’ is the total charge relating to H+ adsorption on integrated peak area of hydrogen adsorption/desorption; ‘mpt’ is the active mass of Pt catalyst (gm^2) on GCE.

What is cyclic voltammetry primarily used for in chemistry?

Cyclic voltammetry (CV) is a type of potentiodynamic electrochemical measurement. Cyclic voltammetry is generally used to study the electrochemical properties of an analyte in solution or of a molecule that is adsorbed onto the electrode.

What is potentiometry used for?

Potentiometry, one type of electrometric method, is used to determine the concentration of a solute in solution. In potentiometric measurements, the potential between two electrodes is measured using a high impedance voltmeter.

Why KCl is used in calomel electrode?

The advantage in using saturated KCl is that [Cl−] does not change if some liquid evaporates. If an electrode has a potential of −0.461 V with respect to a calomel electrode, what is the potential with respect to a silver-silver chloride electrode?

Why is KCl used in pH meter?

To maintain a constant potential of the Ag/AgCl electrode an electrolyte solution is needed, which has sufficient chloride ions (Cl-) and which is pH-neutral. Commonly used are KCl solutions, which are 3 molar or saturated. With gel filled electrodes there is sufficient potassium chloride in the gel.

What is saturated KCl?

The concentration of saturated KCl depends on the temperature-dependent solubility. In our bottles, there are always crystals of KCl in excess to ensure saturation. KCl solubility at 20°C: 0,340 g·cm-3 in water = 340 g/l = 4.56 mol/l (Saturated KCl at 20°C)

What is the function of a platinum electrode?

platinum is a inert electrode,thus it do not participate in the cell reaction but provide a surface or platform for oxidation and reduction reaction. It also helps in conduction of electrons.

What is the use of platinum electrode?

Platinum Electrode: How its chemical comp osition affects electrochemical reactions. Pt is a noble metal that is very stable and resistant to corrosion. Because of its stability, like Au, it is often used to make jewelry. As an electrode, it is used to oxidize organics or to generate hydrogen or reduce oxygen.

How does a platinum electrode work?

Platinum electrodes are exposed to different oxygen pressures and the cell essentially transports oxygen from the high- to low-pressure side until the pressures equilibrate.

What is standard hydrogen electrode explain with diagram?

A Standard Hydrogen Electrode (SHE) is an electrode that scientists use for reference on all half-cell potential reactions. The value of the standard electrode potential is zero, which forms the basis one needs to calculate cell potentials using different electrodes or different concentrations.

What is the pH of the standard hydrogen electrode?

about 2-12