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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.
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 ...
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 ...
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.
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]
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.
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 ...
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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