Electrochemical kinetics

Question 1

What is the equation for electrochemical reaction?

Answer 1

Question 2

What is the equation for cathodic current?

Answer 2

𝐶o/r = concentration of the oxidised or 𝑂/𝑅
reduced species in solution at the electrode interface

Question 3

What is the equation for the anodic current?

Answer 3

𝐶o/r = concentration of the oxidised or 𝑂/𝑅
reduced species in solution at the electrode interface

Question 4

What is the equation for total current through the electrode?

Answer 4

Question 5

What are the two Arrhenius equations?

Answer 5

Question 6

Draw the diagram that explains ΔG‡ f(cathodic) vs b(anodic)

Answer 6

Question 7

What is the equation for the rate change of f, with electrode potential?

Answer 7

Question 8

What is the equation for the rate change of b, with electrode potential?

Answer 8

Question 9

What is the equation for the rate change of equilibrium with electrode potential?

Answer 9

Question 10

What is the Bulter-Volmer equation?

Answer 10

Question 11

What is the equation of current at equilibrium and where is the bulk concentration found?

Answer 11

Bulk concentration found at surface

Question 12

What is the equation for Eeq?

Answer 12

Question 13

What is the equation for exchange current?

Answer 13

Question 14

What is the equation for current?

Answer 14

Question 15

What are the assumptions of the Bulter-Volmer model?

Answer 15

1. That all the electrons are arriving together in a single rate determining step (as n electrons) … instead one electron might be the rate determining step (RDS) (Butler-Volmer must usually be modified for multi-step redox reactions)
2. That diffusion is much faster than electron transfer, i.e. ET is rate limiting (The exchange current term assumes that [O] is the same as [O]* (in bulk), the true concentration at the electrode)