Q $2$: Select the correct answer:

$7$ degree

The using of oxygen at the cathode instead of air $($at the same pressure$)$ will result in the performance of the PEMFC.

a$.$ increasing

b$.$ decreasing

c$.$ no effect on

What are the main components of the fuel cell?

What are the main components of the electrode $($anode or cathode$)$ of the fuel cells?

What is the main challenges of the Nafion membrane?

A fuel cell stack composed of $50$ cells. Calculate the number of the end plates and the number of the bipolar plates in such a stack?