The development of sustainable methodologies for the synthesis of organic compounds is a fundamental challenge in modern organic chemistry. This project is focused on advancing the fields of photoredox catalysis (PRC) and synthetic photoelectrochemistry, exploring their applications in oxidative C-H substitution reactions. In the first place, we propose the synthesis and characterization of novel photoredox catalysts derived from naphthalene diimides, targeting their ability to form stable radical ions under visible light irradiation. Additionally, the project aims to evaluate the catalytic activity of these catalysts in model reactions, employing consecutive photoinduced electron transfer (conPET) and electro-photoredox catalysis (e-PRC) mechanisms, where the formation of the excited state of radical ions is the key catalytic step. The ultimate goal is to optimize reaction conditions through the exploration of environmentally friendly solvents, thereby expanding the applicability of these strategies. This work seeks to contribute to the development of efficient catalytic systems for selective and sustainable organic transformations, highlighting the potential of visible light and electricity as clean, versatile reagents.