Question

For a Hydrogen - Oxygen fuel cell if
AH°(H20,1) = - 285 kJ/mole, then what
will be its thermodynamic efficiency under
standard conditions (use data given in the
passage if required)?
0.91

0.41

0.63

0.83​

Answer 1

The fuel cell thermodynamic efficiency is given by the ratio of the Gibbs function change to the Enthalpy change in the overall cell reaction. The Gibbs function change measures the electrical work and the enthalpy change is a measure of the heating value of the fuel.