April 2016
Intermediate to advanced
548 pages
19h 23m
English
Content preview from Ecological Sustainability
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197Mitigations of Human Impacts through Technology
At the cathodes, the O
2
is reduced with water to form hydroxyl ions.
O H O e OH V
reduced
2 2
0
2 4 4 0 40
↓
−
↓
−
+ + → = +( . )E
(4.16)
In the zinc paste anode, the following occur:
Zn OH ZnOH e V
oxidized
4
=
+ → + = −
− −
↑
4 2 0 625
0
( . )E (4.17)
ZnOH ZnO OH H O
4
=
→ + + +
−
2
2
(4.18)
The overall ZAFC reaction is
Zn + ½ O
2
→ ZnO (4.19)
R
L
O
2
CO
2
CO
2
CO
2
H
2
H
2
O + heat
CO
3
=
+
e
–
e
–
I
Anode Cathode
Electrolyte
FIGURE 4.23
Schematic of an MCFC. See text for details of operation.
198 Ecological Sustainability
Typical specications for a ZAFC (one of several) used to power
busses include the followi
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