Nowadays, the exploration of new photoelectrode architectures to improve the light-harvesting and charge-collection properties of photoelectrochemical cells and related devices have been regarded as a challenging work. The efficient, stable, visible light absorption and cost effective photoelectrode materials are certainly important in developing highly efficient PEC system. Here, we synthesized the various metal oxide and nitrides for photoelectrochemical water splitting. Based on their synthesis methods and intrinsic properties, we tested the possibility(large-scale and stability) toward their PEC applications. Related deep insight would be discussed in terms of the fundamental analyses and reasonable results based on the theoretical background to give an meaningful potential for the future PEC world.