Hydrogen a transportation fuel

Although our own research at Argonne National Laboratory showed that hydrogen from electrolysis is not an energy efficient way to power motor vehicles, we concluded that electrolyzer efficiency is generally above 70%, not 60% as claimed by Standing (though some maintain that the efficiency could reach above 80%). Using an energy efficiency of 70-75% and considering the energy content of 115,000 btu (lower heating value) per kg of hydrogen, we estimated that one kg of hydrogen requires about 47 kw-hr of electricity, not 64.5 kw-hr implied by Standing. On the other hand, with an energy efficiency of 70% as adopted by Standing, a fuel cell could produce 23.6 kw-hr of energy per kg of hydroge...

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