Consider a 15-cell stack hydrogen fuel cell operating steadily in series with 200 cm2 active area per electrode, with a current density of 0.9 A/cm2. The fuel cell nominal voltage is 0.5 V per plate.
a) If the stoichiometry at the anode is 2, how many moles/second of hydrogen is being provided (don't forget there are 15 cells!).
b) If the stoichiometry at the cathode is 4, how many moles/second of oxygen is being provided?
c) If oxygen made up 20% of the air, at what rate would air need to be supplied to the fuel cell (assuming all the air was used up this time, unlike in part b)?
d) What is the water production in grams/hour?
e) What is the power output of the fuel cell?