Page 26 - Introduction to Transfer Phenomena in PEM Fuel Cells

1.2.1.2.1. Operating characteristics
Table 1.3 summarizes the characteristics and performance of the PEMFC
[BOU 07]. Introduction to Hydrogen Technology 15
Characteristics and performance
Operating temperature 60 to 80°C
Operating pressure 1 to 3 bar
Electrical efficiency 40 to 50%
Actual voltage 0.6 to 0.95 V
Current density Up to A/cm²
Start-up time Practically immediate
Response time to a rapid variation in Very fast
demand
1,000 to 2,000 hours (value in 2005)
Lifetime Up to 4,000 hours [HFC Consulting Group]
Current tests to reach 8000 hours

Table 1.3. Characteristics and performance of a PEMFC

1.2.1.2.2. Advantages and disadvantages
These cells have some advantages [BLU 07, BOU 07]:

– very fast start-up time;
– very fast response time;

– compactness;
– insensitive to CO 2;
– the electrolyte is solid. There is therefore no risk of electrolyte leakage;

– the operating temperature is low;
– the mass power is high, the power density can reach 1 kW/kg.