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  2. Hydrogen internal combustion engine vehicle - Wikipedia

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

    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. The fuel cell has a high efficiency peak at low load, while at high load the efficiency drops.

  3. Fuel cell bus - Wikipedia

    en.wikipedia.org/wiki/Fuel_cell_bus

    Fuel cell bus. Foton Motor hydrogen fuel cell bus in Beijing, China in 2018. A fuel cell bus is a bus that uses a hydrogen fuel cell as its power source for electrically driven wheels, sometimes augmented in a hybrid fashion with batteries or a supercapacitor. The only emission from the bus is water. Several cities around the world have ...

  4. Energy density - Wikipedia

    en.wikipedia.org/wiki/Energy_density

    Data from same reference as for liquid hydrogen. [21] High-pressure tanks weigh much more than the hydrogen they can hold. The hydrogen may be around 5.7% of the total mass, [22] giving just 6.8 MJ per kg total mass for the LHV. See note above about use in fuel cells. Hydrogen, gas (1 atm or 101.3 kPa, 25 °C) 141.86 (HHV) 119.93 (LHV) 0.01188 ...

  5. Fuel cell - Wikipedia

    en.wikipedia.org/wiki/Fuel_cell

    The alkaline fuel cell (AFC) or hydrogen-oxygen fuel cell was designed and first demonstrated publicly by Francis Thomas Bacon in 1959. It was used as a primary source of electrical energy in the Apollo space program. [44] The cell consists of two porous carbon electrodes impregnated with a suitable catalyst such as Pt, Ag, CoO, etc.

  6. 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]

  7. Comparison of commercial battery types - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_commercial...

    Common characteristics. Rechargeable characteristics. Thermal runaway. NiCd vs. NiMH vs. Li-ion vs. Li–polymer vs. LTO. See also. References. Comparison of commercial battery types. This is a list of commercially-available battery types summarizing some of their characteristics for ready comparison.

  8. Hydrogen storage - Wikipedia

    en.wikipedia.org/wiki/Hydrogen_storage

    Due to its clean-burning characteristics, hydrogen is a clean fuel alternative for the automotive industry. Hydrogen-based fuel could significantly reduce the emissions of greenhouse gases such as CO 2, SO 2 and NO x. Three problems for the use of hydrogen fuel cells (HFC) are efficiency, size, and safe onboard storage of the gas. Other major ...

  9. 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. ...

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