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  2. Hydrogen internal combustion engine vehicle - Wikipedia

    en.wikipedia.org/wiki/Hydrogen_internal...

    Using hydrogen's lower heating value, the maximum fuel cell efficiency would be 94.5%. [33] The efficiency of a hydrogen combustion engine can be similar to that of a traditional combustion engine. If well optimized, slightly higher efficiencies can be achieved. The comparison with a hydrogen fuel cell is interesting.

  3. Fuel cell - Wikipedia

    en.wikipedia.org/wiki/Fuel_cell

    Fuel cells can produce electricity continuously for as long as fuel and oxygen are supplied. The first fuel cells were invented by Sir William Grove in 1838. The first commercial use of fuel cells came almost a century later following the invention of the hydrogen–oxygen fuel cell by Francis Thomas Bacon in 1932.

  4. Energy density Extended Reference Table - Wikipedia

    en.wikipedia.org/wiki/Energy_density_Extended...

    battery, Hydrogen closed cycle H fuel cell [18] 1.62: Hydrazine decomposition (as monopropellant) 1.6: 1.6: Ammonium nitrate decomposition (as monopropellant) 1.4: 2.5: Thermal Energy Capacity of Molten Salt: 1 [citation needed] 98% [19] Molecular spring approximate [citation needed] 1: battery, Lithium–Manganese [20] [21] 0.83-1.01: 1.98-2. ...

  5. Toyota Mirai - Wikipedia

    en.wikipedia.org/wiki/Toyota_Mirai

    The MPG-equivalent combined city/highway fuel economy rating was 66 mpg ‑US (3.6 L/100 km; 79 mpg ‑imp), making the Mirai the most fuel-efficient hydrogen fuel cell vehicle rated at the time by the EPA, and the one with the longest range. [11]

  6. Energy conversion efficiency - Wikipedia

    en.wikipedia.org/wiki/Energy_conversion_efficiency

    For example, an ideal fuel cell operating at a temperature of 25 °C having gaseous hydrogen and gaseous oxygen as inputs and liquid water as the output could produce a theoretical maximum amount of electrical energy of 237.129 kJ (0.06587 kWh) per gram mol (18.0154 gram) of water produced and would require 48.701 kJ (0.01353 kWh) per gram mol ...

  7. High Temperature Proton Exchange Membrane fuel cell

    en.wikipedia.org/wiki/High_Temperature_Proton...

    Whereas the common PEM fuel cell, also called Low Temperature Proton Exchange Membrane fuel cell (LT-PEM), must usually be operated with hydrogen with high purity of more than 99.9 % the HT-PEM fuel cell is less sensitive to impurities and thus is typically operated with reformate gas with hydrogen concentration of about 50 to 75 %.

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