<p><span style=color: rgba(0 0 0 1)>This book gathers selected research on the preparation characterization and application of new organic/inorganic composites endowed with photo(electro)catalytic properties for the photocatalytic production of H2. In these pilot studies the photoactive materials were tested under either UV-visible or even more conveniently under visible light for H2&nbsp;evolution in sacrificial water splitting or photoreforming systems. In addition a review article on the use of 2D materials and composites as potential photocatalysts for water splitting is included.</span></p>