Abstract: With gradual decrease in our conventional energy resources and the grave threat of global warming, there is a need to find sources that are long lasting. Hydrogen as fuel provides a very good option. Hydrogen production uses Natural gas and electrolysis of water, thus directly or indirectly creating pollution. As per this, we cannot say Hydrogen as a clean energy. So, we need to categorize clean Hydrogen production techniques. In this review paper, we will brief the biological methods of Hydrogen production from biomass. Also, we will look into direct hydrogen applications.

Keywords: Biological H2 production, Aerobic Reaction, Anaerobic reactions, Fuel cell.