Page 39 - Introduction to Transfer Phenomena in PEM Fuel Cells

28 Introduction to Transfer Phenomena in PEM Fuel Cells
Figure 1.11 shows the operating principle of a DMFC.

Figure 1.11. Operating principle of a DMFC

1.2.1.7.1. Operating characteristics

Table 1.8 summarizes the characteristics and performance of a DMFC
[BOU 07].

Characteristics and performance
Operating temperature ~ 60°C
Operating pressure ~ 1 to 3 bars
Electrical efficiency ~ 30 to 50%
Actual voltage 0.4 to 0.7 V
Current density 100 to 200 mA/cm²
Start-up time Practically immediate
Response time to a rapid variation in demand Very fast

Table 1.8. Characteristics and performance of a DMFC