Hydrogen is one of two natural elements that combine to make water. Hydrogen is not an energy source, but an energy carrier because it takes a great deal of energy to extract it from water. It is useful as a compact energy source in fuel cells and batteries. Many companies are working hard to develop technologies that can efficiently exploit the potential of hydrogen energy. This page lists articles about hydrogen fuel as an alternative energy source.
Hydrogen fuel enhancement is a term used to describe the use of a mixture of hydrogen and conventional hydrocarbon fuel in an internal combustion engine (ICE). The hydrogen can be stored as a second fuel, reformed from the conventional fuel, or in theory produced through the electrolysis of water.
There has been a great deal of research into fuel mixtures, such as gasoline and nitrous oxide injection. Mixtures of hydrogen and hydrocarbons is no exception. These sources suggested that there could be fuel efficiency saving and reduced emission through the addition of hydrogen to conventional fuels. For example, one research project added hydrogen to an automobile engine to run the engine leaner:
Lean-mixture-ratio combustion in internal-combustion engines has the potential of producing low emissions and higher thermal efficiency for several reasons. First, excess oxygen in the charge further oxidizes unburned hydrocarbons and carbon monoxide. Second, excess oxygen lowers the peak combustion temperatures, which inhibits the formation of oxides of nitrogen. Third, the lower combustion temperatures increase the mixture specific heat ratio by decreasing the net dissociation losses. Fourth, as the specific heat ratio increases, the cycle thermal efficiency also increases, which gives the potential for better fuel economy.
Many of these sources have also warn that it would require modifications in ICE's air/fuel ration, engine timing, and other design elements to realize these advantages. This would be expected for any change in an engines fuel composition.
Hydrogen fuel enhancement from electrolysis has been promoted for use with diesel trucks and often with adaptation of the water-fuelled cars scam. However recent tests by consumer watch groups have shown negative results.