Energy demand is on the rise all over the world. Nevertheless, using renewable energy sources has become increasingly important in the recent years because of the fast depleting fossil fuels. Hydrogen energy is particularly noteworthy among renewable energy sources. Due to the cost of hydrogen storage cost, various hydrogen generation techniques are being developed. Research into systems that can provide alternatives to hydrogen production using energy derived from fossil fuels has accelerated in recent years. The generation of H2 and O2 from water through photoelectrochemical means is an innovative and environmentally friendly approach. This study used the hydrothermal method to synthesize nanostructures with three different properties: CeVO4, TiO2, and SnS. Different n-type and/or p-type photoelectrochemical systems with nanostructures of varying properties were applied to indium tin oxide (ITO) substrates to examine their impact on the water dissociation reaction. Various semiconductor structures were analyzed for their properties through the study of H2 production using the photocatalytic method and O2 production using the photoelectrochemical method. Ternary photocatalyst and photoelectrode studies were conducted using semiconductors with varying band gaps and chemical activities to enhance both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) efficiencies. Semiconductor-based nanostructures were synthesized via the hydrothermal method and characterized using Xray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), diffused-reflectance spectroscopy (DRS) and Mott-Schottky techniques. For OER measurements, these semiconductor systems were applied as a thin film on ITO glass using a spin coating device. Characterization measurements of photocatalytic and photoelectrochemical activities were conducted with the help of sunlight produced by a solar simulator.