Table of Contents
What is the diffusion coefficient of Ferricyanide?
The diffusion coefficient for ferricyanide was determined to be 7.3 ± 0.7 × 10─6 cm2/s (n = 15) using the slope of the line in Figure 7, right, and the previously determined K for the electrode geometry. This value is within 2% of the literature value of diffusion coefficient for ferricyanide.
What is the value of diffusion coefficient?
A typical diffusion coefficient for a molecule in the gas phase is in the range of 10-6 to 10-5 m2/s. By contrast, diffusion for molecules dissolved in liquids is far slower. In an aqueous (water) solution, typical diffusion coefficients are in the range of 10-10 to 10-9 m2/s.
What is the diffusion coefficient of copper?
The self-diffusion coefficient of copper has been determined by tracer techniques through the use of a precision grinder and a precision lathe. The temperature dependence over the range 685-1062°C is given by D=0.468exp(−47140RT) cm2/sec.
What is the diffusion coefficient of the particles?
The diffusion coefficient (D) is the amount of a particular substance that diffuses across a unit area in 1 s under the influence of a gradient of one unit. It is usually expressed in the units cm2 s−1.
What is diffusion coefficient in Randles Sevcik equation?
Randles-Sevcik Equation In this equation, k is a constant of 2.69 x 105 with units of C mol-1 V-½, n is the number of electrons appearing in the half-reaction for the redox couple, A is the electrode area (cm2), D is the analytes diffusion coefficient (cm2 s-1) and v is the rate at which the potential is swept (V s-1).
What is the diffusion coefficient for sodium ion in water?
The diffusion coefficient of Na+ and Cl- ions in water, extracted from relevant data in Table 2, are found to be 1.33 x 10-5 cm2/s and 2.03 x 10-5 cm2/s respectively. These ionic diffusion coefficients do not take into consideration the effect of solvation of the water molecules on the ionic species.
What is diffusion coefficient in electrochemistry?
Diffusion Coefficients The diffusion coefficient is the proportionality between flux and concentration gradient. The electrode area can be determined electrochemically with equations equivalent to an equation and by using a redox couple having a known diffusion coefficient.
On what factors the diffusion coefficient depends?
Diffusion coefficient depends on size and shape of molecule, interaction with solvent and viscosity of solvent.
How do you calculate peak current on CV?
the peak current ratio = ipa/ipc = 1 at all scan rates. the peak current function ip/n1/2 (n = scan rate) is independent of n (see equation for peak current)