Use of Hydrogen as a Fuel

A fuel is any material that can be made to react with other substances so that it releases energy as heat energy or to be used for work. It is solely applied on those materials who can be transferred to an energy source by changing their chemical properties. Material such as coal, gas, or oil that is burned to produce heat or power. The heat energy produced by combustion/burn is used to do mechanical works with the help of various mechanisms and machines (i.e. heat pumps, heat engines). Combustion exerts highly toxic pollutants (i.e. NOx, CO2). Hydrogen and fuel cells are not synonymous; they can be deployed in combination or separately. Fuel cells can operate on natural gas, which avoids combustion and thus 90% of airborne pollutants. Hydrogen can be burnt in engines and boilers with no direct CO2 and near-zero NOX emissions. When used together, hydrogen fuel cells are zero-emission at the point of use, with overall emissions dependent on the fuel production method (as with electricity).