China's hydrogen production capacity is about 40 million tons per year, and the output is about 33 million tons per year. However, most of the hydrogen is produced from fossil fuels or industrial by-products, which is regarded as grey hydrogen. Specifically, nearly...
Hydrogen offers several advantages over traditional fossil fuels. It can be produced from water, making it almost inexhaustible. Hydrogen combustion is clean, with water being the only byproduct, compared to the CO2and other harmful emissions from gasoline or diesel. The main challenge for hydrogen...
From future scenario analyses in 2015, all H2 pathways are expected to have lower life cycle costs than the conventional fuels as a transportation fuel. It is evident that the FCV price is the most important factor for encouraging the hydrogen economy and FCVs. Unless the FCV price is below...
Nickel-based catalysts are the most promising candidates for PGM-free HOR catalysts in alkaline, but the HOR performance of pristine Ni is only 1/1000 to 1/100 of that of Pt16. Many efforts have been made to improve the HOR performance of the Ni-based materials. Alloying Ni with other t...
other energy sources. In addition, it contains a much larger chemical energy by mass (142 MJ) than any of the other hydrocarbon fuels. Moreover, it has energy by weight of 123 MJ kg−1, which is 3 times than that of gasoline and much higher than any of the other fossil fuels (e...
As these fuels have different properties, the conception of the engines using them and the involved combustion mechanism are different. The general steps of the four-strokes engine are: (1) Air inlet from valve opening, piston goes down which creates a depression in the chamber, (2) Piston ...
where the calorific value ΔΔ is a property of the fuels whose value depends on the state of the water produced in the chemical reaction (liquid or gas). Then, if we perform the numerical integration, the hydrogen consumption results are given by: 𝐶𝑜𝑛𝑠𝐻2[𝑔/𝑠]=∫𝑡...
Hydrogen fuel-cell vehicles are related to electric cars, but these machines have pros and cons that make them different from the typical battery-powered EV.
Finally, fuels derived from different hydrogen supply options are assessed. Substantially lower GHG emissions, compared to the fossil reference (natural gas and diesel/gasoline), are only possible if hydrogen from electrolysis powered by renewable energy is used (>90% less). The other hydrogen ...
(29% hydrogen in air), very little ignition energy is needed, and a simple static discharge can light the mixture. However, at concentrations near the lower flammability limit, the MIE is comparable to that of other fuels. In cases where a hydrogen leak is ignited, the high dispersion rate...