(Solved): (d) (i) Draw a schematic diagram of a hydrogen/oxygen fuel cell. (ii) Explain why a fuel cell can a ...

(d) (i) Draw a schematic diagram of a hydrogen/oxygen fuel cell. (ii) Explain why a fuel cell can achieve higher efficiencies than an internal combustion engine. (iii) Consider a fuel cell operating on propane and oxygen. Write the equation for the cell reaction and state the number of electrons transferred. If \( \Delta \mathrm{G} \varnothing \) for the reaction is \( -1319 \) \( \mathrm{kJ} / \mathrm{mol} \), calculate the thermodynamic limit to the zero-current potential of this fuel cell. 10 marks