Question

A fuel cell operates at constant current, with H$_2$ fuel (1 bar) and O$_2$ oxidant (1 bar). The electrolyte used is 0.001 M HCl and the product(s) of the reaction are confined inside the fuel cell. Which of the following is true about the electrolyte?

• A. Boiling point of the electrolyte decreases with increase in the duration of fuel cell operation
• B. Boiling point of the electrolyte increases with increase in the duration of fuel cell operation
• C. Open circuit voltage of the fuel cell remains constant with increase in duration of operation
• D. Open circuit voltage of the fuel cell increases with increase in duration of operation
• E. Both (A) and (C)

Hint:

Water production in a confined fuel cell always leads to the dilution of the electrolyte, which in turn reduces the boiling point and increases the freezing point of the solution.

Answer 1

The Correct Option is A