Page 36 - Introduction to Transfer Phenomena in PEM Fuel Cells

and when the output power exceeds 100 KW [SPI 07]. Internal reactions are
as follows:
– anode: Introduction to Hydrogen Technology 25
−
H (g) O ⎯⎯→ H O(g) 2e − [1.13]
+
+
2
2
2
– cathode:
1 O(g) 2e ⎯⎯→ O − [1.14]
−
+
2 2 2
– overall reaction:
H (g) + 1 O (g) ⎯⎯→ H O(g) [1.15]
2
2 2 2
Figure 1.10 shows the operating principle of a SOFC.

Figure 1.10. Operating principle of a SOFC