FE Flashcards
(68 cards)
Nernst equation
Faraday’s law
Faraday number
96 500
Nernst equation Julia
What is overpotential?
Which potential should an oxidant have for 99% and 90% conversion?
+0.236 V for 99%
+0.11V for 90%
Which potential should a reductant have for 90% and 99% conversion?
-0.236V for 99%
-0.11V for 90%
What is different for irreversible reactions?
Basic of electron transfer
Types of mass transport
Linear diffusion
duck shape
radial diffusion
sigmoidal shape
What are the electrodes in a three electrode cell?
auxiliary
working
reference (should have a high potential)
What is the NHE electrode?
Give the reatcion
normal hydrogen electrode (E = 0V)
2 H+ +2- = H2
Draw the NHE!
script
What is the SCE electrode?
GIve its reactions!
Saturated Calomel Electrode
Give the reactions of aqueous and non-aqueous silver reference electrodes!
scrip
Draw a cv and give all 5 parameters!
look up
what is the intrinsic rate constant?
look
Which processes are considered as reversible?
page 17
What does the Randles-Sevcik equation tell you?
give prportionalities (p18)
What are the diagnostic criteria to check if a process is reversible?
To check:
- record CV at variable scan rate
- measure ip
Potential:
- Epf is independent on scan rate
- - Delta Ep = 59/n
Current:
- ipr/ipf = 1 and is constant
- ipf/v^1/2 is constant and independent on scan rate
How can you determine formal potential from cv?
p19
What are the diagnostic criteria for irreversible processes?
p20
What are the diagnostic criteria for quasireversible processes?
p21
