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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
185Electrochemical Kinetics
The plot of η versus j, called the Tafel plot, is a straight line with inter-
section a and slope b (Tafel slope). The ratio of Tafel slope and current
density has units of resistance. In the Tafel kinetic region, the charge
transfer resistance (R
ct
) is dened by
R
j
b
j
ct
d
d
==
η
.
(5.90)
Thus, in the Tafel kinetic region, R
ct
decreases inversely with j or, in other
words, η increases with an increase of j for a cathodic reaction.
Thus, experimentally, j
0
and α can be determined using a Tafel plot.
The Tafel form of equation holds if the reverse reaction contributes to
less than 1% of the current density or
e
αFη/RT
/e
βFη
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Publisher Resources

ISBN: 9781420089684