Hydrogen for a sustainable energysystem: a review

In this paper, we will try to shed some light on how to overcome the two challenging problems the world has been facing regarding energy, by using hydrogen for a sustainable energy system. These two main problems are:1st: Fossil fuels,which meet about 80 % of our energy needs today, are being depleted fast.2nd: The use of fossil fuels is causing major environmental problems.Solution of these interrelated problems has been pursued through the use of what is called Sustainable Energy Resources (SER). Hydrogen is introduced as an energy carrier to utilize SER in an effective and non-polluting way. The analogy between hydrogen and blood circulation as energy carriers is established in this investigation; where hydrogen provides energy in an energy system while blood transports nutrients, and oxygen in human body to provide nourishment. Methods of hydrogen production have been presented. The pros and cons of using hydrogen in our system are illustrated. Data on the overall efficiency of conversion of solar energy to produce hydrogen using different options are cited with illustrations.