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Fuel Cells
book

Fuel Cells

by Shripad T. Revankar, Pradip Majumdar
May 2014
Beginner to intermediate content levelBeginner to intermediate
748 pages
23h 13m
English
CRC Press
Content preview from Fuel Cells
175Electrochemical Kinetics
For the case when there is a thermodynamic equilibrium, the forward and
reverse reactions must balance each other so that the net current density is zero.
j
i
j
2
= 0. (5.54)
Thus, for a thermodynamic equilibrium condition,
j
1
= j
2
= j
0
.
(5.55)
j
0
is called the exchange current density for the reaction. At equilibrium, the net
reaction rate is zero, though forward and reverse reactions take place.
The exchange current density is now:
j nFC ke nFC k
FE ERT
00 0
0
==
−−
Ox,surfRed Red,surf
eq
α ()/
OOx
eq
e
FE ERTβ
()
/
,
0
(5.56)
where E
eq
is the equilibrium potential. The rate constants k
0Red
and k
0Ox
are
dened as
kkThe
GRT
0
1
Ox B
=
(/)
/∆
(5.57)
kkThe
GRT
0
2
RedB
=
(/
).
/∆
(5.58)
For equilibrium condition, the rate constants are equal.
k ...
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Publisher Resources

ISBN: 9781420089684