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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
292 Fuel Cells
Figure7.4 shows an initial nonuniform distribution of element i in a medium
of j. Atoms of species i diffuse from the region of high concentration to the
region of low concentration and establish a more uniform concentration dis-
tribution of the species. Self-diffusion also takes place in a relatively pure
crystalline solid material controlled by a process known as vacancy mecha-
nism or the hopping process. The ion transport in crystalline electrolyte is con-
trolled by this vacancy diffusion or hopping diffusion mechanism. In this
(a)
(b)
(c)
Diffusion
E
E
a
E
o
FIGURE 7.4
Solid-state self-diffusion by hopping or vacancy mechanism.
293Ch ...
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Publisher Resources

ISBN: 9781420089684