Calculation of Electrical Efficiency Produced by the Fuel Cell-Multiple Choice Question

Question

A fuel cell converts the chemical energy in fuel and oxidant to electric energy (as shown in the figure to the right). The reversible potential for the hydrogen electrode, E⁰H₂, is 0 volt versus the reversible hydrogen electrode (RHE). The reversible potential for the oxygen electrode, E⁰O₂ is 1.2 volt vs. RHE   

A fuel cell is operating with a current density, j of 0.3A/cm², and a cell voltage , V^cell of 0.6 volt, as it uses hydrogen as the fuel and oxygen as the oxidant. What is the electrical efficiency (given in%) produced by the fuel cell?

1. 100%
2. 75%
3. 65%
4. 50%
5. None of the above