Excessive use of non-renewable energy sources encourages the introduction of alternative fuels, especially hydrogen by the application of photocatalytic water splitting employing solar energy irradiation. Numerous efforts have been made in the attempt to develop effective photocatalysts with a wide range of solar radiation activity. One of the most widely used photocatalytic materials is TiO2 which, despite its many advantages, has limitations such as rather large band gap energy (Eg). A potential solution for its improvement lies in designing composite materials of TiO2 with other photocatalysts active under visible light radiation. This work carried out a detailed photoelectrochemical characterization of composite materials based on TiO2, specifically TiO2-SnS2/GO-RGO with different proportions of GO-RGO, and for the complete comparison, the individual components of this composite were analyzed. Immobilized photocatalysts on FTO substrates were used as electrodes, while all measurements were performed in 0.1 M NaCl solution. The following methods were used for photoelectrochemical characterization: LSV, EIS, OCP and MS analysis. Based on the results and the calculation of the recombination constant of photogenerated charges, a TSG 60-labeled composite was selected for further research, which was tested in 0.1 M NaCl solution with the addition of various agents that act as electron donors and thus reduce recombination constants within the synthesized composite materials. Ethylene glycol, methanol and triethanolamine were used in different volumes. The lowest recombination constant of photogenerated charges, kr = 0.007 s^-1, was achieved in a 20 vol% solution of methanol in NaCl, indicating that there is a good synergistic effect in the composite material that allows good charge separation and transfer which reduces the charge recombination rate.