Consider the following three applications of fuel cells for producing electricity to power a vehicle.
(a) A proton exchange membrane fuel cells use hydrogen produced by electrolysis using electricity generated by burning coal.
(b) A proton exchange membrane fuel cells use hydrogen produced by electrolysis using electricity generated by a photovoltaic array.
(c) A solid oxide fuel cell uses methane as a fuel.
For each discusses as quantitatively as possible.
(1) The overall efficiency of converting primary energy to energy at the vehicle's wheel.
(2) The CO2 emissions per MJ of energy at the vehicle's wheel.
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