1. Introduction to hydrogen as energy vector (shorter chapter written by the editors) 2. Nanomaterials and biomass valorization for Hydrogen production 3. Processes (upstream and downstream) for hydrogen production 4. Technologies of alternative activation in hydrogen production/conversion 5. Advanced technologies in improving catalytic/electrocatalytic processes and materials synthesis 6. Hydrogen evolution reactions technology and nanomaterials 7. Coupleted biohydrogen production, reforming processes and hydrogen purification for fuel cell application 8. Fuel cells and nanomaterials 9. Hydrogen storage nanomaterials and new technologies 10. Transportation, distribution and storage of hydrogen 11. Hydrogen market and socio-economic aspects