摘要： In the last few decades, nanostructured materials have been of great interest worldwide due to their unique characteristics and their sub-driven reactivity. Furthermore, the unlimited applications of such materials in different fields and their associated success had added extra value for their importance. The combination between nanomaterials and photocatalytic processes has been recently given a great attention in different applications. It may enhance the viability of the nanotechnology principles. One of these applications is the usage of nanophotocatalytic materials in hydrogen production via water-splitting reaction. This chapter will cover the main concepts of photocatalysis and its associated terms. The main features of efficient photocatalysts and the ways of measuring such properties are illustrated in this chapter. Also, a brief presentation for the current methods that are utilized in the preparation of these catalysts is provided. An overview of the different types of semiconductors that are employed in the domain of photo-based hydrogen generation via splitting of water is introduced through this chapter too. A new approach in the water-splitting process by introducing noble metals attached magnetic nanoparticle (core/shell structure) as promising photomaterials is also described in this chapter. However, these materials are used in different fields such as bio-medical processes, water treatment, and energy storage. They are expected to be of high significance in field of catalysis, since they can be easily separated and recovered, due to their magnetic character, reactions. Implementation of a suitable magnetic force can enhance the hydrogen productivity during the water-splitting process. These materials are possessing magnetic properties which could reveal a new approach to their photocatalytic activity via quenching the radiation scattering.