In future energy carriers hydrogen is a renewable energy carrier produced from water and a renewable energy source eg solar energy furthermore if a future society is able to operate fusion reactors and produce heat and electricity from this nearly unlimited energy source an energy carrier like hydrogen will be needed in. Hydrogen may play a key role in a future sustainable energy system as a carrier of renewable energy to replace hydrocarbons this review describes the fundamental physical and chemical properties of hydrogen and basic theories of hydrogen sorption reactions followed by the emphasis on state of the art of the hydrogen storage properties of selected interstitial metallic hydrides and magnesium . The density in parenthesis is the theoretical limit of the given material from ref 16 h2 storage the very interesting high gravimetric energy density 39 kwh kg 1 of hydrogen is however . Hydrogen is an energy carrier 42 43 in other words it is an intermediate medium for energy storage and carriage hydrogen is the most abundant element of the earth approximately corresponding 75 of the elemental mass of the universe 44 and it is the simplest and lightest element of all chemical elements with an atomic number of 1. Hydrogen can be used as fuel as an energy carrier or as an industrial chemical it can be toxic flammable and explosive its specific properties were described in section 2221 because it has been in industrial use for more than a century there are already established guidelines for its safe utilization however with the newly
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