Question 1

For a simple electron transfer reaction, the coupling of mass transfer and kinetics at the electrode surface is described by

Accepted Answer

The coupling of mass transfer and kinetics at the electrode surface is described by relating the species flux and the current in a simple electron transfer reaction. This is known as the Butler-Volmer equation, which relates the anodic and cathodic current densities to the concentrations of the oxidized and reduced species at the electrode surface.

Question 2

In case of a rotating disc electrode (RDE), as per Levich equation, the diffusion layer thickness depends on kinematic viscosity ($\nu$) as

Accepted Answer

The diffusion layer thickness depends on kinematic viscosity ($\nu$) as $$v ^ { 1 / 6 }$$ according to Levich equation.

Question 3

In the derivation of the Warburg impedance equation, it is assumed that the following effects can be neglected

Accepted Answer

In the derivation of the Warburg impedance equation, it is assumed that convection and electromigration effects can be neglected. The equation primarily accounts for diffusion-controlled processes at the electrode-electrolyte interface.

Question 4

Consider the following reaction $$A \underset { k _ { 2 } } { \stackrel { k _ { 1} } { \rightleftarrows } }B + e ^ { - }$$

. The concentration of A and B in bulk solution are equal. When a positive dc bias is applied (vs. OCP), under steady-state conditions, on the surface,

Accepted Answer

When a positive dc bias is applied, the reaction is driven towards the production of B and e^-. This means the concentration of B at the surface (C_B) will be greater than the concentration of A (C_A) under steady-state conditions, as the applied potential favors the forward reaction.

Question 5

For a simple electron transfer reaction, with finite diffusion layer thickness (bounded Warburg impedance) the charge transfer resistance

Accepted Answer

Charge transfer resistance increases both when the dc bias is increased or decreased from the open circuit potential (OCP), due to the deviation from the equilibrium condition which maximizes the efficiency of electron transfer.

Question 6

The equation that describes Bounded Warburg impedance is

Accepted Answer

The answer of The equation that describes Bounded Warburg impedance...

Question 7

Under semi-infinite boundary conditions, for a simple electron transfer reaction, the concentration oscillations and current oscillations have a phase offset (in radians) of

Accepted Answer

The answer of Under semi-infinite boundary conditions, for a simple...

Question 8

CPE behavior may be expected when the electrode has

Accepted Answer

CPE behavior is expected when there is both 2D and 3D heterogeneity present in the electrode. This is because the fractal nature of the electrode surface results in non-integer values for the exponent of the frequency-dependent capacitance.

Question 9

If CPE exponent is -1, the element is

Accepted Answer

CPE exponent of -1 indicates a capacitor.

Question 10

Consider a porous electrode. E_dc = 0 V vs. OCP, and there is no reaction. When an ac potential is applied, at the pore end (x = l),

Accepted Answer

In a porous electrode with no reaction and an applied ac potential, the potential gradient at the pore end is zero because the potential is uniform across the electrode.

Question 11

Consider a system which exhibits CPE behavior. Given R_sol = 100 $\Omega$ cmS1U1P12S1S1P0, R_t = R_p = 200 $\Omega$ cm², and CPE parameters Y₀ = 5×10^-5 (rad s^-1)^1-ⁿ, n =0.8 , the equivalent capacitance as per Brug's formula is __________ $\mu$F cm² and as per Hsu & Mansfeld formula is _________ $\mu$F cm²

Accepted Answer

The answer of Consider a system which exhibits CPE behavior....

Question 12

According to empirical studies, when the CPE parameter Y₀ increases, the value of n

Accepted Answer

The answer of According to empirical studies, when the CPE...

Question 13

If a porous insulating film is present on an electrode surface, the film component may be modeled with a

Accepted Answer

A porous insulating film on an electrode surface can be modeled by a capacitor in parallel with a series combination of resistor and Warburg impedance. The capacitor represents the charging and discharging of the electrical double layer at the electrode/electrolyte interface, while the resistor and Warburg impedance represent the resistance and diffusion of ions through the porous film. So, the C option is the best choice which includes all of these components in one model.

Question 14

In a film, two types of defects that are considered in point defect model are ________ (one word) and interstitial

Accepted Answer

The answer of In a film, two types of defects...

Question 15

As per PDM, cation interstitials are consumed at

Accepted Answer

According to Point Defect Model (PDM), cation interstitials are consumed at the film-solution interface, where they react with the anions in the solution to form neutral atoms or ions that can diffuse into the solution. The metal-film interface is the site of metal adatoms and vacancies, not cation interstitials. Therefore, choice B is the best answer.

Question 16

During anion vacancy creation, the film thickness remains constant

Accepted Answer

During anion vacancy creation, the film thickness typically decreases because anions are removed from the lattice, leading to a reduction in the overall volume of the material.

Question 17

PDM employs the following equation to describe mass transfer in the film

Accepted Answer

The Nernst-Planck equation is used in the Pore Diffusion Model (PDM) to describe mass transfer in the film, as it accounts for the effects of concentration gradients, electric fields, and other forces on the movement of ions or molecules through a medium.

Question 18

CPE can arise from the following distribution of time constants

Accepted Answer

CPE (Constant Phase Element) behavior can arise from a normal distribution of logarithmic time constants, which accounts for the dispersion in the system's response.

Question 19

If CPE exponent is 0, then the element is

Accepted Answer

CPE exponent, also known as the power-law exponent, is a parameter used in the impedance modeling of electrochemical systems. A CPE circuit element is a constant phase element, which is a modified version of capacitor or resistor. When the CPE exponent is 0, it means that the impedance of the element is frequency-independent, which is the characteristic of a pure resistor. Therefore, the correct choice is C) resistor.

Question 20

A Temkin isotherm model will reduce to Langmuir isotherm when parameter "g" is _____

Accepted Answer

The answer of A Temkin isotherm model will reduce to...

Quiz 6: Eis Other Physical Phenomena

For a simple electron transfer reaction, the coupling of mass transfer and kinetics at the electrode surface is described by

In case of a rotating disc electrode (RDE) , as per Levich equation, the diffusion layer thickness depends on kinematic viscosity ( $\nu$ ) as

In the derivation of the Warburg impedance equation, it is assumed that the following effects can be neglected

Consider the following reaction $A \underset { k _ { 2 } } { \stackrel { k _ { 1} } { \rightleftarrows } }B + e ^ { - }$ . The concentration of A and B in bulk solution are equal. When a positive dc bias is applied (vs. OCP) , under steady-state conditions, on the surface,

For a simple electron transfer reaction, with finite diffusion layer thickness (bounded Warburg impedance) the charge transfer resistance

The equation that describes Bounded Warburg impedance is

Under semi-infinite boundary conditions, for a simple electron transfer reaction, the concentration oscillations and current oscillations have a phase offset (in radians) of

CPE behavior may be expected when the electrode has

If CPE exponent is -1, the element is

Consider a porous electrode. E_dc = 0 V vs. OCP, and there is no reaction. When an ac potential is applied, at the pore end (x = l) ,

Consider a system which exhibits CPE behavior. Given R_sol = 100 $\Omega$ cm², R_t = R_p = 200 $\Omega$ cm², and CPE parameters Y₀ = 5×10^-5 (rad s^-1)^1-ⁿ, n =0.8 , the equivalent capacitance as per Brug's formula is __ $\mu$ F cm² and as per Hsu & Mansfeld formula is _ $\mu$ F cm²

According to empirical studies, when the CPE parameter Y₀ increases, the value of n

If a porous insulating film is present on an electrode surface, the film component may be modeled with a

In a film, two types of defects that are considered in point defect model are ________ (one word) and interstitial

As per PDM, cation interstitials are consumed at

During anion vacancy creation, the film thickness remains constant

PDM employs the following equation to describe mass transfer in the film

CPE can arise from the following distribution of time constants

If CPE exponent is 0, then the element is

A Temkin isotherm model will reduce to Langmuir isotherm when parameter "g" is _____

Quiz 6: Eis Other Physical Phenomena

For a simple electron transfer reaction, the coupling of mass transfer and kinetics at the electrode surface is described by

In case of a rotating disc electrode (RDE) , as per Levich equation, the diffusion layer thickness depends on kinematic viscosity ( ν\nuν ) as

In the derivation of the Warburg impedance equation, it is assumed that the following effects can be neglected

For a simple electron transfer reaction, with finite diffusion layer thickness (bounded Warburg impedance) the charge transfer resistance

The equation that describes Bounded Warburg impedance is

Under semi-infinite boundary conditions, for a simple electron transfer reaction, the concentration oscillations and current oscillations have a phase offset (in radians) of

CPE behavior may be expected when the electrode has

If CPE exponent is -1, the element is

Consider a porous electrode. Edc = 0 V vs. OCP, and there is no reaction. When an ac potential is applied, at the pore end (x = l) ,

According to empirical studies, when the CPE parameter Y0 increases, the value of n

If a porous insulating film is present on an electrode surface, the film component may be modeled with a

In a film, two types of defects that are considered in point defect model are ________ (one word) and interstitial

As per PDM, cation interstitials are consumed at

During anion vacancy creation, the film thickness remains constant

PDM employs the following equation to describe mass transfer in the film

CPE can arise from the following distribution of time constants

If CPE exponent is 0, then the element is

A Temkin isotherm model will reduce to Langmuir isotherm when parameter "g" is _____

In case of a rotating disc electrode (RDE) , as per Levich equation, the diffusion layer thickness depends on kinematic viscosity ( $\nu$ ) as

Consider a porous electrode. E_dc = 0 V vs. OCP, and there is no reaction. When an ac potential is applied, at the pore end (x = l) ,

According to empirical studies, when the CPE parameter Y₀ increases, the value of n